Penn System 450 Series User manual

System 450 Series Control Modules with Analog
Outputs Installation Guide
Application
Important: Use this System 450™ Series Control
Module with Analog Outputs only as an operating
control. Where failure or malfunction of the System
450 could lead to personal injury or property damage
to the controlled equipment or other property,
additional precautions must be designed into the
control system. Incorporate and maintain other
devices, such as supervisory or alarm systems or
safety or limit controls, intended to warn of or
protect against failure or malfunction of the System
450 Module.
Important: Utiliser ce System 450 Series Control
Module with Analog Outputs uniquement en tant
que dispositif de contrôle de fonctionnement.
Lorsqu'une défaillance ou un dysfonctionnement
du System 450 risque de provoquer des blessures
ou d'endommager l'équipement contrôlé ou un
autre équipement, la conception du système de
contrôle doit intégrer des dispositifs de protection
supplémentaires. Veiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que
des systèmes de supervision ou d'alarme, ou des
dispositifs de sécurité ou de limitation, ayant une
fonction d'avertissement ou de protection en cas de
défaillance ou de dysfonctionnement du System 450
Module.
System 450 is a family of modular, digital electronic
controls that you can easily assemble and set up to
provide reliable temperature, pressure, and humidity
control for a wide variety of HVACR and commercial and
industrial process applications.
You can use the System 450 control modules to configure
custom application-specific control systems with up
to three input sensors and 10 (relay, analog, or both)
outputs, including control systems that can monitor and
control temperature, pressure, and humidity applications
simultaneously.
You can easily install and quickly configure a stand-
alone System 450 control module and sensor in the field
as a replacement control for almost any temperature,
pressure, and humidity control.
C450CPN-4 and C450CQN-4 models are analog output
control modules with LCD and a four-button touchpad UI
for setting up a System 450 control system. C450CPN-4
models provide one self-selecting analog output, and
C450CQN-4 models provide two self-selecting analog
outputs.
Refer to the System 450 Series Modular Control Systems with
Standard Control Modules Technical Bulletin (LIT-12011459)
for more detailed information on designing, installing,
setting up, and troubleshooting System 450 Series control
systems.
Installation
Figure 1: System 450 module dimensions, mm (in.)
Location considerations
Observe the following System 450 location guidelines:
• Ensure that the mounting surface can support the
module assembly, mounting hardware, and any user-
supplied panel or enclosure.
• Mount the modules upright and plugged together in a
horizontal row where possible. See Figure 3. It is best
practice to mount the module with a DIN rail.
• Mount modules on flat, even surfaces.
• Allow sufficient space for wires and connections.
• Mount the modules in locations free of corrosive
vapors. Observe the ambient operating conditions
listed in the System 450 Series Control Modules with
Analog Outputs technical specifications.
• Do not mount the modules on surfaces that are prone
to vibration or in locations where radio frequency or
electromagnetic emissions may cause interference.
• Do not install the modules in airtight enclosures.
• Do not install heat-generating devices in an enclosure
with the modules that may cause the temperature to
exceed the ambient operating limit.
24-7664-3191 Rev. C
2021-01-14
C450CPN, C450CQN

Mounting
It is best practice to mount System 450 modules on 35 mm
DIN rail. You can also mount the module directly onto an
even wall surface. See:
•Mounting modules on DIN rail
•Direct-mounting modules to wall surfaces
Mounting modules on DIN rail
1. Provide a section of 35 mm DIN rail that is longer
than the module assembly width, and mount the
DIN rail horizontally in a suitable location using
appropriate mounting hardware/fasteners.
2. Clip the control module on the rail, position the
upper DIN rail clips on the top rail, and gently snap
the lower clips onto the rail.
3. Clip the remaining power and expansion modules
to the right of the control module onto the DIN rail
and plug the 6-pin module connectors together.
See Figure 3.
Note:
- DIN rail end clamps can be used to
prevent the module assembly from
sliding off the DIN rail.
- If your System 450 control system uses a
power module, you must plug the power
module into the right-hand side of the
control module.
Direct-mounting modules to wall surfaces
1. Plug the modules together, remove the module
covers, place the assembly against the wall surface
horizontally in a suitable location, and mark the
mount hole locations on the surface. See Figure 1.
2. Install appropriate screw fasteners, leaving the
screw heads approximately one to two turns away
from flush to the surface.
3. Place the assembly over the screw heads on the
mounting slots, and carefully tighten the mounting
screws.
Note: If you mount the modules on an uneven
surface, do not damage the housings when
tightening mounting screws. Use shims or
washers to mount the module assembly evenly
on the surface.
Result
Refer to the control sensor installation guide for
information about locating and mounting control sensors.
Wiring
See Figure 2 and Table 1 for electrical termination
locations and wiring information. See System 450
Series Control Modules with Analog Outputs technical
specifications for electrical ratings.
WARNING
Risk of Electric Shock
Disconnect or isolate all power supplies before making
electrical connections. More than one disconnection
or isolation may be required to completely de-energize
equipment. Contact with components carrying
hazardous voltage can cause electric shock and may
result in severe personal injury or death.
AVERTISSEMENT
Risque de décharge électrique
Débrancher ou isoler toute alimentation avant
de réaliser un branchement électrique. Plusieurs
isolations et débranchements sont peut-être
nécessaires pour -couper entièrement l'alimentation
de l'équipement. Tout contact avec des composants
conducteurs de tensions dangereuses risque
d'entraîner une décharge électrique et de provoquer
des blessures graves, voire mortelles.
Important:
• Use copper conductors only. Make all wiring
connections in accordance with local, national, and
regional regulations.
• Do not exceed the System 450 module electrical
ratings. Exceeding module electrical ratings can
result in permanent damage to the modules and
void any warranty.
• Run all low-voltage wiring and cables separate
from all high-voltage wiring. Shielded cable is
strongly recommended for sensor input and
analog output cables that are exposed to high
electromagnetic or radio frequency noise.
• Electrostatic discharge (ESD) can damage System
450 modules. Use proper ESD precautions during
installation and servicing to avoid damaging
System 450 modules.
• Do not apply power to a C450Y Power Module or
the 24 VAC/VDC power source for the System 450
modules before you finish wiring and checking all
wiring connections. Short circuits or improperly
connected wires can result in damage to the
modules and void any warranty.
• You can connect a System 450 control module and
module assembly to an internal power source (a
System 450 power module) or an external power
source (24 VAC/VDC power connected to the 24
V and COM terminals on the control module),
but you cannot connect to both power sources
simultaneously. Connecting a control module to
both internal and external power sources can
damage the modules and void any warranty.
System 450 Series Control Modules with Analog Outputs Installation Guide2

• When connecting System 450 compatible sensors
with shielded cable to a System 450 control
module, connect the cable shield drain lead to one
of the C (common) terminals on the input sensor
terminal block. Do not connect the shield at any
other point along the cable. Isolate and insulate
the shield drain at the sensor end of the cable.
Connecting a cable shield at more than one point
can enable transient currents to flow through
the sensor cable shield, which can cause erratic
control operation.
Figure 2: C450CxN-4 wiring terminals
Table 1: System 450 Analog Output Control Module terminal wiring information
Label Terminal function Wire sizes
24V Accepts 24 VAC/VDC supply power when a C450YNN power module is
not connected, and provides a power terminal for 24 VAC/VDC humidity
sensors.
5V Provides 5 VDC power for active sensors.
Sn-1, Sn-2, Sn-3 Accepts passive or active (0–5 VDC) input signals from control sensors.
The control automatically selects a passive or active sensor circuit for
each input based on the sensors selected in the setup screens.
COM Provides a connection for the 24 VAC/VDC supply common input.
C
(Two Terminals)
Provides low-voltage circuit Common (C) connections for passive or active
sensors connected to the 5V, Sn1, Sn2, and Sn3 terminals.
Note: The three C terminals are connected internally.
0.08 mm2 to 1.5 mm2
28 AWG to 16 AWG
AO1, AO2 Provides a self-detecting analog output signal in conjunction with the C
terminal; either 0–10 VDC or 4–20 mA.
C Provides a low voltage circuit Common (C) path for the analog outputs
(AO1 and AO2)
0.08 mm2 to 2.5 mm2
28 AWG to 14 AWG
System 450 Series Control Modules with Analog Outputs Installation Guide 3

Figure 3: System 450 Cooling Control System with condenser fan speed control example
Setup and adjustments
The following information describes how to setup and
adjust the System 450 control system. A System 450
control system consists of one control module, one to
three control sensor inputs, and one to ten outputs that
provide On/Off control or analog control. Figure 3 shows
an example of a System 450 module assembly with two
sensors and three outputs (two analog outputs and one
relay output).
Setting up a System 450 module
assembly
1. Determine the controlled conditions, sensor
types, and value ranges that are required for your
application, and select the appropriate System 450
sensor types.
2. Determine the number and type (relay or analog)
of outputs required to control your application, and
select the appropriate System 450 control module
and expansion modules to provide the outputs.
3. Assemble the control and expansion modules in
the proper order, starting with the control module
on the left.
Note:
- If you use a C450YNN-1 power module,
you must plug it into the control module.
Plug in any expansion modules for your
control system to the right of the power
module.
- After you power on your module
assembly, you can set up your control
system in the control module UI before
wiring the sensors or outputs to your
assembly. If the sensors are set up in the
UI but not connected, the LCD displays
an SNF Sensor Failure.
Setting up a control system in the user
interface
About this task:
System 450 control modules have a backlit LCD and a
four-button touchpad UI that you can use to set up your
control system. See Figure 4 and Table 2. To set up a
control system in the System 450 UI:
1. Build your control system module assembly and
connect it to power. See Setting up a System 450
module assembly.
Note: Every time a module assembly is
powered ON, the control module polls all of
the modules to identify output type (relay
or analog) and assigns a sequential output
number (1 to 9 [0 = 10]) to each output starting
with the control module output on the left. The
output numbers identify each output’s setup
screens in the UI. (See Figure 4 and Table 2.)
2. Access the System 450 setup screens in the UI. See
Accessing the System 450 Setup Start screens.
3. Set up the control system inputs or sensors in the
UI. See Setting up System 450 Sensors.
4. Set up the control system outputs in the UI. See
Setting up System 450 outputs.
Important: Do not change the module
positions after a System 450 control system
is set up in the UI. System 450 control logic is
set up in the UI according to the Sensor Types,
the output types, and the output numbers.
Changing modules or module positions in a
module assembly that is already set up in the
UI can change the output numbers, output
types, and the setup values of the assembly
outputs, which requires setting up the outputs
again.
System 450 Series Control Modules with Analog Outputs Installation Guide4

Figure 4: System 450 Control Module Output Analog LEDs,
LCD, four-button touchpad UI
Table 2: System 450 Control Module Output Analog
LEDs, LCD, four-button touchpad UI
Callout Feature Description
1 Status or
setup value
Displays the current input status, output
status, or setup parameter value for the
displayed input sensor, output, or setup
parameter. Press Down or Up to select
a different parameter value when the
value is flashing. Here, 100 = 100%.
2 LED Green LEDs on Analog Control Module
and Analog Expansion Modules (only)
indicate the analog output’s signal
strength. When the analog output
signal is between 0 and 10 VDC, the LED
blinks. The higher the output signal
strength, the longer the LED is on. The
LED is off when the analog output is not
generating a signal.
3 Output
number
Displays a numerical value that
identifies the output associated with
the status or setup value shown on
the screen. Output numbers are
automatically determined by the
outputs' physical positions (left to
right) in the module assembly. Here,
4 = Output 4.
4 Control
ramp icon
Displays whether an analog output
(only) is set as direct-acting or reverse
acting, and whether the output signal
strength is at minimum or maximum
when the sensed property is at Setpoint.
The control ramp icon displayed is
determined by the output's SP, EP, OSP,
and OEP setup values.
Table 2: System 450 Control Module Output Analog
LEDs, LCD, four-button touchpad UI
Callout Feature Description
5 Next button In the Main screens, press Next to scroll
through the system status screens. In
a setup screen, press Next to save the
flashing setup value and go to the next
setup screen.
6 Up and
Down
buttons
Press Up or Down to select a different
value for any flashing value in the setup
value field. In the Main sensor status
screens, press and hold both Up and
Down for 5 seconds to access the setup
Start screens.
7 Menu
button
Press M to move through the sensor
and output setup start screens. When
moving through the status or setup
screens, press M to return to the status
start screen or setup start screen.
8 Status
or setup
identifier
Displays the unit of measurement,
output, sensor number, or setup
parameter for the displayed status or
setup value. Here, the setup identifier
OSP represents % output signal
strength at setpoint.
9 LCD Backlit LCD screen. The LCD brightness
is adjustable. During normal operation,
the LCD displays the Main screens.
Viewing the Startup, Main, and System
Status screens
Every time you connect power to a System 450 control
module, the Startup screen appears for several seconds
before the Main screens appear. The Startup screen
displays the current firmware version for the module.
After you install, wire, power on, and set up your control
system in the UI, the Main screens appear on the LCD,
immediately after the Startup screen. During normal
operation, the Main screens automatically scroll through
the current status of each sensor in your control system
and the backlight low level setting is applied.
The System Status screens display the current status of
each input and output in your control system. With the
Main screen displayed, press any key to exit idle mode,
then press Next repeatedly to scroll through and view all
of the status screens in your control system.
When you power on a System 450 control module, the
LCD displays the control module’s current firmware
version for approximately five seconds before it displays
the Main (Input Status) screen. The following figure
shows System 450 firmware version number 4.00 on
the top of the screen. The number on the bottom of the
screen (indicated in this example with xxxx) identifies the
Johnson Controls firmware.
Figure 5: Startup screen
System 450 Series Control Modules with Analog Outputs Installation Guide 5

Note: The System 450 firmware versions identify the
control features that are available. Standard System
450 control modules with version 2.00 firmware
and later include the High Input-Signal Selection
and Differential Control features. See High input-
signal selection and Differential control for more
information.
During normal operation, the Main screens automatically
scroll through the current status of each input sensor in
your control system and display the sensor number, the
unit of measurement, and the sensed condition value.
Main screens are view-only; selections are not made
in Main screens. The Main screens are the System 450
default screens. After 2 minutes of inactivity in any screen,
the UI returns to the Main screens.
While the Main screens are scrolling, you can press any
key to exit idle mode, then press Next repeatedly to scroll
through and view the System Status screens for all inputs
and outputs in your control system.
While the Main screens are scrolling, you can press any
key to exit idle mode, then press and hold Up and Down
for 5 seconds to access your control system’s Setup Start
screens.
In the following figure, the top two screen examples show
Sensor 1 sensing 70°F and Sensor 2 sensing 74°F. The
third screen example shows a Temperature Differential
Sensor that is sensing a -4 degree differential. The bottom
screen shows Sensor 3 set up as a Binary Input and the
input is open.
Figure 6: Main (Input Status) screens
The System Status screens display the current status
of all inputs and outputs in your control system. System
Status screens are view-only; selections are not made
in Status screens. Relay output status screens display
output number and relay status (On/Off). Analog output
status screens display output number, signal strength,
and control ramp icon.
Press Next repeatedly to scroll and view the System
Status screens for the inputs and outputs in your control
system. When you stop pressing Next, the displayed
Status screen refreshes its value and remains displayed
for 2 minutes before returning to the Main screens.
In the following figure, the screen examples show that the
Output 1 relay is On and the signal strength of Output 3
is 61% of the total signal strength. The control ramp icon
in the bottom screen example indicates that the Analog
Output is set up with SP<EP and OSP<OEP. See Setting up
an analog output for information about ramp icons.
Figure 7: System Status screens
The Setup Start screens are view-only screens from which
you can access the setup screens for the sensors, the
displayed output, or the backlight brightness. The Sensor
Setup Start screen is the first screen displayed when you
access the System 450 setup screens.
Note: The numerical order and type of Output Setup
Start screens are determined by the modules that
are selected for your System 450 control system and
their physical order in the control system module
assembly. See Setting up a control system in the
user interface for more information.
From the Sensor Setup Start screen, press M repeatedly
to scroll through the Output Setup Start screens for all
of the outputs in your control system. When a Setup Start
screen is displayed, press Next to go to the setup screens
for the sensors or the output displayed in the screen.
Note: In any Setup Start screen, you can return to
the Main screens by pressing both Up and Down
simultaneously. Also, the UI returns to the Main
screen after 2 minutes of inactivity in any screen.
The following figure shows the Sensor, Relay Output 1,
Analog Output 3, and LCD Backlight Brightness Setup
Start screens.
Figure 8: Setup Start screens
Accessing the System 450 Setup Start screens
About this task:
Access the System 450 Setup Start screens from the
Main screen. See Viewing the Startup, Main, and System
Status screens for more information about the Setup Start
screens.
To access the System 450 setup screens:
System 450 Series Control Modules with Analog Outputs Installation Guide6

1. Power on the module assembly. After the Startup
screen appears briefly (displaying the control
module firmware version), the Main screen
appears on the LCD.
2. With the Main screen displayed, press any key to
exit idle mode, then press and hold Up and Down
simultaneously for 5 seconds to access the setup
screens and go to the Sensor Setup Start screen.
3. Press M repeatedly to scroll through the Output
Setup Start screens. See System 450 menu flow
examples.
Note: The UI returns to the Main screens after
2 minutes of inactivity in any screen in the UI.
Setting up System 450 Sensors
About this task:
You must set up the input sensors for your control system before you can set up any outputs. To set up the input sensors
you must access the setup screens. The Sensor Setup Start screen is the first screen displayed when you access the
system setup screens. Table 3 provides information about System 450 sensors, Sensor Types, parameter values, and
specified sensor or transducer product code numbers. The steps following the table provide sensor setup information,
procedures, and example screens. System 450 menu flow examples provides a System 450 UI setup example.
Table 3: System 450 Sensor Types, Setup Values, and Sensor or Transducer product codes
Sensor type
Unit of measurement code
(condition/units)
Effective sensing
range
1Range of usable
values1Resolution increment
value
Minimum proportional or
control band
2Sensor product type number2
°F °F (Temperature/degrees) -46 to 255 -40 to 250 1 1 A99x-xxx
°C °C (Temperature/degrees) -43 to 124 -40 to 121 0.5 0.5 A99x-xxx
rH % (Humidity/%RH) 1 to 100 10 to 95 1 2 HE-69Sx0NP
HE-68Nx-0N00WS
P 0.25 INWC (Pressure/in. W.C.) -0.250 to 0.250 -0.225 to 0.250 0.005 0.01 DPT2650-R25B-AB
P 0.5 INWC (Pressure/in. W.C.) 0 to 0.5 0.025 to 0.5 0.005 0.01 DPT2650-0R5D-AB
P 2.5 INWC (Pressure/in. W.C.) 0 to 2.5 0.1 to 2.5 0.02 0.1 DPT2650-2R5D-AB
P 5 INWC (Pressure/in. W.C.) 0 to 5.0 0.25 to 5.0 0.05 0.25 DPT2650-005D-AB
P 8 bAR (Pressure/bar) -1 to 8 -1 to 8 0.05 0.1 P499RCP-401C
P 10 INWC (Pressure/in. W.C.) 0 to 10 0.5 to 10 0.05 0.2 DPT2650-10D-AB
P 15 bAR (Pressure/bar) -1 to 15 -1 to 15 0.1 0.2 P499RCP-402C
P 30 bAR (Pressure/bar) 0 to 30 0 to 30 0.1 0.4 P499RCP-404C
P 50 bAR (Pressure/bar) 0 to 50 0 to 50 0.2 0.4 P499RCP-405C
P 100 PSI (Pressure/psi) 0 to 100 0 to 100 0.5 1 P499RAP-101C
P499RAP-101K
P499RCP-101C
P499RCP-101K
P599RAPS101C
P599RAPS101K
P599RCPS101C
P599RCPS101K
3P 1103InHg/PSI (Pressure in.Hg/psi) -10 to 100 -10 to 100 0.5 1 P499RAPS-100C
P499RAPS-100K
P499RCPS-100C
P499RCPS-100K
P599RAPS100C
P599RAPS100K
P599RCPS100C
P599RCPS100K
P 200 PSI (Pressure/psi) 0 to 200 0 to 200 1 1 P499RAP-102C
P499RCPS102C
P499RCPS102K
P599RAPS102C
P599RAPS102K
P599RCPS102C
P599RCPS102K
P 500 PSI (Pressure/psi) 0 to 500 90 to 500 1 5 P499RAP-105C
P499RAP-105K
P499RCP-105C
P499RCP-105K
P599RAPS105C
P599RAPS105K
P599RCPS105C
P599RAPS105K
P 750 PSI (Pressure/psi) 0 to 750 150 to 750 2 6 P499RAP-107C
P499RAP-107K
P499RCP-107C
P499RCP-107K
P599RAPS107C
P599RAPS107K
P599RCPS107C
P599RCPS107K
System 450 Series Control Modules with Analog Outputs Installation Guide 7

Table 3: System 450 Sensor Types, Setup Values, and Sensor or Transducer product codes
Sensor type
Unit of measurement code
(condition/units)
Effective sensing
range
1Range of usable
values1Resolution increment
value
Minimum proportional or
control band
2Sensor product type number2
HI°F °F (Temperature/degrees) -50 to 360 4-40 to 35041 1 TE-631x
TE-6000-x
TE-68NT-0N00S
HI°C °C (Temperature/degrees) -45.5 to 182 -40 to 176 0.5 0.5 TE-631x-x
TE-6000-x
TE-68NT-0N00S
bin 5Open or Closed5 (Dry Contacts) N/A N/A N/A N/A N/A
1 See Differential control for information on setting up the System 450 Differential Control feature.
2 Refer to the System 450 Series Modular Controls Product Bulletin (LIT-12011458), Catalog Page (LIT-1900549), or the System 450 Series
Controls Systems Technical Bulletin (LIT-12011459) for additional ordering information for System 450 compatible sensors and
transducers.
3 See Setting up outputs that reference a P110 sensor for information on setting up System 450 outputs that reference the P110
Sensor Type.
4 Many of the temperature sensors that can be set up as HI°F or HI°C Sensor Types are not designed for use across the entire range
of usable values for HI°F and HI°C Sensor Types. Refer to the Technical Specifications for the sensor you intend to use to determine
the ambient temperature range that the sensor is specified to operate in. The TE-6000-6 Nickel Sensor is the only sensor designed
for use over the entire temperature range.
5 Selecting the bin Sensor Type for a sensor (Sn-1, Sn-2, or Sn-3) sets up the input to control relay outputs (only) based on the state
of the binary input contacts (open or closed) connected to the sensor input (Sn1, Sn2, or Sn3). See Binary input control for relay
outputs for more information. Can only be used for relay outputs.
To set up System 450 Sensors:
1. In the Sensor Setup Start screen, press Next to
go to the first Sensor Type Selection screen (Sn-1)
and begin setting up the sensors in your control
system.
The Sensor Setup Start screen is the first
screen that is displayed when you access the
System 450 setup screens. From the Sensor
Setup Start screen, you can navigate to the
Output Setup Start screens or the Sensor Setup
screens. See System 450 menu flow examples.
The following figure shows the Sensor Setup
Start screen with flashing dashes.
Figure 9: Sensor Setup Start screen
Note: You must set up the input sensors before
you can set up the control system outputs.
The Sensor Setup Start screen is view-only;
selections are not made in Setup Start screens.
2. In the Sn-1 Sensor Type Selection screen, press
Up or Down to select a Sensor Type. Press Next to
save your selection and go to the Sn-2 Sensor Type
Selection screen.
The following figure shows Sn-1 with the P500
Sensor Type selected, Sn-2 with the °F Sensor
Type selected, and Sn-3 with the no Sensor Type
selected.
Figure 10: Sensor Type Selection screens
The Sensor Type that you select for an input
sensor automatically determines the setup
parameters and values for each output that
is set up to reference that sensor. See Table
3 for information about System 450 sensors/
transducers, Sensor Types, condition type, units
of measurement, minimum control band or
proportional band, setup values, value ranges,
and product code numbers.
Note:
- For outputs to operate properly, the
selected Sensor Type must match the
sensor/transducer model wired to
the control module, and the sensor/
transducer must be wired to the proper
control module input terminals.
System 450 Series Control Modules with Analog Outputs Installation Guide8

- Beginning with firmware Version 2.00,
if you select the same Sensor Type for
Sn-1 and Sn-2, two additional functional
sensors (Sn-d and HI-2) are available
for selection when you set up the
control system outputs. If you select
the same Sensor Type for Sn-1, Sn-2,
and Sn-3, then functional sensor HI-3
is also available for selection when you
set up outputs. See High input-signal
selection and Differential control for
more information.
3. In the Sn-2 Sensor Type Selection screen, press
Up or Down to select a Sensor Type. Press Next to
save your selection and go to the Sn-3 Sensor Type
Selection screen.
Note: If your control system does not use three
input sensors, simply press Next while the two
dashes are flashing in a Sensor Type Selection
screen to save no Sn-3 Sensor Type and go to
the next setup screen.
4. In the Sn-3 Sensor Type Selection screen, press
Up or Down to select a Sensor Type. Press Next to
save your selection and either:
- go to the Temperature Offset Setup screen
for the first temperature sensor in your
system.
- return to the Sensor Setup Start screen,
if your control system has no temperature
sensors.
5. Press Up or Down to select a temperature offset
value. Press Next to save your selection and either:
- go to the next Temperature Offset Selection
screen (if there are additional temperature
sensors in your control system) and repeat
this step for each temperature sensor.
- return to the Sensor Setup Start screen.
The following figure shows an OFFS value
of -3 (°F) for Sensor 2. Therefore a sensed
temperature value of 75 (°F) at Sensor 2 is
displayed as 72 (°F).
Figure 11: Temperature Offset Setup screens
Select a temperature offset for the temperature
inputs (only) in your control system.
Sensor Type °F enables an offset of +/- 5°F in 1
degree increments. Sensor Type °C enables an
offset of +/- 2.5°C in 0.5 degree increments.
Note: The temperature offset changes the
displayed temperature value by the selected
offset value.
6. When you have finished setting up all of the
sensors for your control system, the display returns
to the Sensor Setup Start screen. After the sensors
are set up for your control system, you can:
- press M to scroll through the Output Setup
Start screens and begin setting up your
system outputs.
- press Up and Down simultaneously to return
to the Main screens.
The following figure shows Sensor Setup Start
screen with flashing dashes.
Figure 12: Sensor Setup Start screen
Note: You can edit the sensor setup values at
any time, if required. However, changing the
Sensor Type for a sensor that is referenced by
an output requires setting up the output again
to the new Sensor Type values.
Setting up outputs that reference a P110
sensor
The P110 Sensor Type can monitor negative pressure
down to 20 InHg (-10 psi). When referencing a P110
sensor, System 450 displays negative pressure values in
InHg on the Main and System Status screens. But when
you set up an output that references a P110 sensor and
the setup value is a negative pressure value, you must
select a pressure value in negative psi. Use Table 4 to
determine the negative psi setup value that corresponds
to your InHg target value. For example, if you want a
relay output to go off when the sensed pressure reaches
7 InHg, you select the value -3.5 (psi) in the output’s Relay
OFF Selection screen.
Table 4: InHg target values/PSI setup values
InHg value
psi setup
value InHg value
psi setup
value
1 -0.5 11 -5.5
2 -1.0 12 -6.0
3 -1.5 13 -6.5
4 -2.0 14 -7.0
5 -2.5 15 -7.5
6 -3.0 16 -8.0
7 -3.5 17 -8.5
8 -4.0 18 -9.0
9 -4.5 19 -9.5
10 -5.0 20 -10.0
System 450 Series Control Modules with Analog Outputs Installation Guide 9

Note: When an output references the P110 Sensor
Type and the output is set up for Differential Control
(Sn-1 and Sn-2 are P110 Sensor Type), the negative
pressure values displayed in the differential pressure
System Status screen (dIFP) are displayed as
negative psi values, not InHg values. See Differential
control for more information.
Binary input control for relay outputs
You can connect a binary input (dry contacts) to any of the
Sn1, Sn2, or Sn3 System 450 control module inputs and
control the output relays in your control system based on
the binary input’s state (open or closed).
An input (Sn-1, Sn-2, or Sn-3) that is set up as a binary
input can only be referenced by a relay output. Inputs
set up as binary inputs are not available for selection on
analog outputs.
When a relay output references a sensor that is set up as
a binary input, the On and Off parameter screens are not
available as you set up the output. The relay output’s On/
Off state is controlled by the binary input’s Closed/Open
state and any of the timer parameters (ONT, OFFT, ONd,
or OFFd) that you set up for the relay output. Refer to
the Binary Input Control for Relay Outputs section of the
System 450 Series Modular Control Systems with Standard
Control Modules Technical Bulletin (LIT-12011459) for more
information.
High input-signal selection
The High Input-Signal Selection feature enables a System
450 control system to monitor a condition (temperature,
pressure, or humidity) with two or three sensors (of the
same type) and control relay, analog, or both outputs
based on the highest condition value sensed by the two or
three referenced sensors.
In two sensor applications (HI-2), Sn-1 and Sn-2 must be
the same Sensor Type. In three sensor applications (HI-3),
Sn-1, Sn-2, and Sn-3 must be the same Sensor Type.
A System 450 control system that uses High Input-
Signal Selection can monitor the outlet pressures of two
condenser coils in a multi-circuit condensing unit using
two pressure sensors of the same type—one connected to
each coil outlet.
If the multi-circuit condensing unit has single speed fan
motors, multiple relay outputs can be set up to reference
the high input-signal and System 450 can stage the fans
on and off based on the pressure sensed at the coil with
the highest pressure.
If the multi-circuit condensing unit has variable speed
fan motors, one or more analog outputs can be set up to
reference the high input-signal and control the fan motor
speeds based on the pressure sensed at the coil with the
highest pressure.
Differential control
System 450 control modules include a Differential Control
feature. Differential control is used to monitor and
maintain a given difference in a condition (temperature,
pressure, or humidity) between two sensor points within a
system, process, or space.
The Differential Control feature enables a System 450
control system to monitor the temperature, pressure, or
humidity differential between two sensors of the same
type (Sn-1 and Sn-2) and control relay or analog outputs
based on the sensed differential value relative to user-
selected differential values (dON, dOFF, dSP, and dEP).
When a Differential Control sensor (Sn-d) is set up, the
displayed differential sensor value is a calculated variable
value: (Sn-d) = (Sn-1) – (Sn-2).
System 450 Series Control Modules with Analog Outputs Installation Guide10

The Sn-d value appears in the System Status screens as
either a temperature differential value (dIFT), pressure
differential value (dIFP), or humidity differential value
(dIFH). The unit of measurement associated with the
displayed differential value is determined by the Sn-1 and
Sn-2 Sensor Type. See Table 3 for Sensor Types and their
units of measurement.
The relay output setup values dON and dOFF are
condition differential values. When a relay output is set
up for differential control, System 450 controls the relay
state (On or Off) based on the difference between Sn-1
and Sn-2 (Sn-d) relative to the user-selected differential
On (dON) and differential Off (dOFF) values.
When an analog output is set up for differential control,
System 450 controls the analog signal strength based on
the difference between Sn-1 and Sn-2 (Sn-d) relative to the
user-selected differential setpoint (dSP) and differential
endpoint (dEP) values.
Differential sensor range of usable
values
The System 450 Differential Control sensor (Sn-d) value
is always equal to Sn-1 minus Sn-2. Depending on the
intended control action of the output, the differential
value may be either a positive or negative value.
Therefore, the range of usable values is twice as large as a
single sensor, and each Sensor Type has an equal number
of positive and negative values. See Table 5 for the range
of usable values when an output references Sn-d.
Note: Binary Inputs cannot be set up to as a
Differential Sensor.
Table 5: Ranges of usable values for sensor types in
Differential Control applications
Sensor
type
Sn-d range of
usable values
Sensor
type
Sn-d range of
usable values
°F -290 to 290 P 30 -30.0 to 30.0
°C -161.0 to 161.0 P 50 -50.0 to 50.0
rH -95 to 95 P 100 -100.0 to 100.0
P0.25 -0.500 to 0.500 P 110 -110.0 to 110.0
P 0.5 -0.500 to 0.500 P 200 -200 to 200
P 2.5 -2.50 to 2.50 P 500 -500 to 500
P 5 -5.00 to 5.00 P 750 -750 to 750
P 8 -9.00 to 9.00 HI°F -380 to 380
P 10 -10.00 to 10.00 HI°C -210.0 to 210.0
P 15 -16.0 to 16.0 -- --
Setting up System 450 outputs
About this task:
After you build and connect power to your control system
module assembly, the output numbers and output types
for your control system are automatically assigned in the
UI.
Note: You must set up the input sensors for your
control system before you can set up the outputs.
See Setting up System 450 Sensors for more
information.
To set up System 450 outputs in the UI:
1. Apply power to your module assembly. After the
Startup screen appears briefly (displaying the
control module firmware version), the Main screen
appears on the LCD.
2. In the Main screen, press any key to exit idle mode,
then press and hold Up and Down simultaneously
for 5 seconds to access the setup screens and to go
to the Sensor Setup Start screen.
3. At the Sensor Setup Start screen, press M
repeatedly to scroll through and select the desired
Output Setup Start screen. The Output Setup Start
screen indicates the output number and the output
type for the selected output.
4. To set up relay outputs, see Setting up a relay
output for setup information and procedures.
5. To set up analog outputs, see Setting up an analog
output for setup information and procedures.
6. To set up the backlight brightness, see Setting up
the LCD backlight brightness for setup information
and procedures.
Setting up a relay output
About this task:
This section provides information, procedures, guidelines,
and screen examples for setting up relay outputs on
System 450 control modules. See System 450 menu flow
examples for example menu flow of the Relay Output 1
setup in this section.
Note: The differential sensor, Sn-d, is used to set up
analog and relay outputs for Differential Control. See
Differential control for more information.
1. In the Relay Output Setup Start screen, press
Next to go to the output’s Sensor Selection screen.
The output numbers and the output type (relay
or analog) are determined by the module types
and configuration of your control system’s module
assembly and are automatically assigned when
you connect power to the module assembly. (See
Setting up a control system in the user interface.)
Note: You must set up the control system input
sensors before you can set up the outputs.
The following figure shows a Relay Output
Setup Start screen for Output 1.
Figure 13: Relay Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down
to select the sensor that the output references:
System 450 Series Control Modules with Analog Outputs Installation Guide 11

- For standard control action, select Sn-1, Sn-2,
or Sn-3.
- For standard control action with High Input-
Signal Selection, select HI-2 or HI-3.
- For differential control action, select Sn-d.
- For binary input control of Relay Outputs,
select bIn.
Then, press Next to save your sensor selection
and go to the Standard Relay ON Selection
screen or the Relay dON Selection screen. The
sensor you select here determines the output’s
setup parameters and values, including
condition type, unit of measurement, minimum
control band, default setup values, and setup
value ranges for several of the remaining
output setup screens. If a sensor is not selected,
the remaining output setup screens do not
appear. If a sensor is already selected for the
output, the Sensor Selection screen does not
appear here and the Relay ON Selection (ON or
dON) screen appears instead.
Note:
- You must select a sensor in this Sensor
Selection screen and the selected sensor
must be already set up in the System 450
UI. (See Setting up System 450 Sensors.)
- On System 450 control modules, the
functional sensors Sn-d and HI-2 are
available, if Sn-1 and Sn-2 are the same
Sensor Type. If Sn-1, Sn-2, and Sn-3 are
the same Sensor Type, the functional
sensor HI-3 is also available.
In the following figure, the top screen example
shows the initial Sensor Selection screen for
Relay Output 1 before a sensor is selected. The
remaining screen examples show some of the
sensors that may be available for selection. For
the Output Relay example, Sn-2 is selected as
the Sensor for Output 1 as shown in the second
screen.
Figure 14: Sensor Selection screens
3. In the Standard Relay ON Selection screen for a
relay output of Sn-1, Sn-2, Sn-3, HI-2, or HI-3, press
Up or Down to select the value at which the output
relay turns on. Relay ON is defined as relay LED On
(lit), relay contacts N.O. to C are closed, and N.C. to
C contacts are open. Then, press Next to save your
selection and go to Relay OFF Selection screen.
Note: The value ranges and minimum control
band are determined by the Sensor Type
selected for the sensor that the output
references and are enforced in the Relay ON
and Relay OFF Selection screens.
In the Differential Relay dON Selection screen
for a relay output of Sn-d, press Up or Down
to select the differential value at which the
output relay turns on. The dON value is a
differential value that represents the intended
difference in the condition (temperature,
pressure, or humidity) between Sn-1 and Sn-2
(Sn-1 minus Sn-2) at which the relay is turned
on. Depending on the intended control action
and the physical location of Sn-1 and Sn-2
sensors in the condition process, dON may be
a positive or negative value. Press Next to save
your selection and go to Relay dOFF Selection
screen.
Note: The unit of measurement, resolution
increment, minimum control band, and
range of usable values for dON and dOFF are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.)
In the following figure, the top screen example
shows an ON value of 78 (°F) selected for Relay
Output 1. The bottom screen example shows a
dON value of 30 (psi) selected for Relay Output
1.
Figure 15: Standard Relay ON Selection and Differential
Relay dON Selection screens
Relay outputs that reference a hard-wired
sensor (Sn-1, Sn-2, or Sn-3) set up with the bIn
(binary input) Sensor Type are controlled by the
binary input contacts state (open or closed).
The ON and OFF screens are not available. The
ON and OFF values are not used to control relay
outputs that reference a binary input sensor. If
you select and save a sensor set up as a binary
input in Step 2, the ON Delay (ONd) screen
appears. Go to Step 5.
System 450 Series Control Modules with Analog Outputs Installation Guide12

4. In the Standard Relay OFF Selection screen for a
relay output of Sn-1, Sn-2, Sn-3, HI-2, or HI-3, press
Up or Down to select the value at which output
relay turns off. Relay OFF is defined as relay LED
Off, relay contacts N.C. to C are closed, and N.O.
to C contacts are open. Then, press Next to save
your selection and go to Relay-ON Delay Time
Selection screen.
Note: The value ranges and minimum control
band are determined by the Sensor Type
selected for the sensor that the output
references and are enforced in the Relay ON
and Relay OFF Selection screens.
In the Differential Relay dOFF Selection
screen for a relay output of Sn-d, press Up or
Down to select the differential value at which
output relay turns off. The dOFF value is a
differential value that represents the intended
difference in the condition (temperature,
pressure, or humidity) between Sn-1 and Sn-2
(Sn-1 minus Sn-2) at which the relay is turned
off. Depending on the intended control action
and the physical location of Sn-1 and Sn-2
sensors in the condition process, dOFF may be
a positive or negative value. dOFF is defined
as relay LED Off, relay contacts N.C. to C are
closed, and N.O. to C contacts are open. Press
Next to save your selection and go to the
Relay-ON Delay Time Selection screen.
Note: The unit of measurement, resolution
increment, minimum control band, and
range of usable values for dON and dOFF are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.)
In the following figure, the top screen example
shows an OFF value of 75 (°F) selected for Relay
Output 1. The bottom screen example shows a
dOFF value of 32 (psi) selected for Relay Output
1.
Figure 16: Standard Relay OFF Selection and Differential
Relay dOFF Selection screens
Relay outputs that reference a hard-wired
sensor (Sn-1, Sn-2, or Sn-3) set up with the bIn
(binary input) Sensor Type are controlled by the
binary input contacts state (open or closed).
The ON and OFF screens are not available. The
ON and OFF values are not used to control relay
outputs that reference a binary input sensor. If
you select and save a sensor set up as a binary
input in Step 2, the ON Delay (ONd) screen
appears. Go to Step 5.
5. In the Relay-On Delay Time Selection screen,
press Up or Down to select the time value (in
seconds) that the output relay delays turning on
after the process condition reaches and maintains
the Relay-On value. The Relay-On Delay time range
is 0 to 300 seconds. Then, press Next to save your
selection and go to the Relay-Off Delay Time
Selection screen.
Note: Beginning with firmware Version 4.00,
the Relay-On Delay feature can be used to delay
the output relay from going to the On state
after the On value is reached at the referenced
input sensor. The condition change must reach
or exceed the output's Relay-On value for the
entire duration of the Relay-On Delay, before
the output relay goes On. This feature can be
used to prevent controlled equipment such
as actuators from being exercised every time
the condition momentarily spikes to the Relay-
On value, reducing wear on the controlled
equipment.
The following figure shows an ONd value of 30
(seconds) selected for Output 1.
Figure 17: Relay-On Delay Time Selection screen
6. In the Relay-Off Delay Time Selection screen,
press Up or Down to select the time value (in
seconds) that the output relay delays turning off
after the process condition reaches and maintains
the Relay Off value. The Relay-Off Delay time range
is 0 to 300 seconds. Then, press Next to save your
selection and go to the Minimum Relay ON Time
Selection screen.
Note: Beginning with firmware Version 4.00,
the Relay-Off Delay feature can be used to
delay the output relay from going to the Off
state after the Off value is reached at the
referenced input sensor. The condition change
must reach or exceed the output's Relay-Off
value for the entire duration of the Relay-Off
Delay, before the output relay goes Off. This
feature is used to prevent controlled equipment
such as actuators from being exercised every
time the condition momentarily spikes to
the Relay-Off value, reducing wear on the
controlled equipment.
The following figure shows an OFFd value of 0
(seconds) selected for Output 1.
Figure 18: Relay-Off Delay Time Selection screen
System 450 Series Control Modules with Analog Outputs Installation Guide 13

7. In the Minimum Relay ON Time Selection screen,
press Up or Down to select the minimum time
that the output relay is required to stay on after
reaching the Relay ON value. The minimum ON
Time range is 0 to 300 seconds. Then, press Next to
save your selection and go to the Minimum Relay
OFF Time Selection screen.
The following figure shows an ONT value of 0
(seconds) selected for Output 1.
Figure 19: Minimum Relay ON Time Selection screen
8. In the Minimum Relay OFF Time Selection screen,
press Up or Down to select the minimum time
that the output relay is required to stay off after
reaching the Relay OFF value. Minimum OFF Time
range is 0 to 300 seconds. Press Next to save
your selection and go to the Sensor Failure Mode
Selection screen.
The following figure shows an OFFT value of
120 (seconds) selected for Output 1.
Figure 20: Minimum Relay OFF Time Selection screen
9. In the Sensor Failure Mode Selection screen,
press Up or Down to select the output’s mode of
operation if the referenced sensor or sensor wiring
fails. Press Next to save your sensor failure mode
selection and go to the Edit Sensor screen.
For outputs that reference functional sensors
HI-2, HI-3, or Sn-d, the failure of any of the
referenced hard-wired sensors results in a
functional sensor failure condition. The output
operates in the selected Sensor Failure mode
until the failure is remedied. Sensor Failure
mode selections for relay outputs include:
-ON = Output relay remains on during sensor
failure.
-OFF = Output relay remains off during sensor
failure.
The following figure shows OFF selected as the
Sensor Failure mode for Output 1.
Figure 21: Sensor Failure Mode Selection screen
10. If you do not need to change the output’s sensor,
simply press Next in the Edit Sensor screen to
save the current sensor selection and return to the
Relay Output Setup Start screen.
To change the sensor the output references,
press Up or Down in the Edit Sensor screen
to select the new sensor that the output
references. Then press Next to save the new
sensor selection and return to the Relay ON
Selection screen (ON or dON). If the new
sensor has a different Sensor Type from the
previously referenced sensor, repeat the output
setup procedure for the output.
Note: If you change the sensor that an output
references to a sensor with a different Sensor
Type, the default setup values for the output
change, and you must set the output up again.
This relay output is now set up in the System
450 UI.
The following figure shows Sn-2 is selected
Sensor for Output 1.
Figure 22: Edit Sensor screen
11. After you have set up this relay output, you can
go to another setup screen or return to the
main screens. In the Relay Output Setup Start
screen, press M to scroll through the remaining
Output Setup Start screens and return to the
Sensor Setup Start screen, or press Up and Down
simultaneously to return to the System 450 Main
screens.
The following figure shows a Relay Output
Setup Start screen for Output 1.
Figure 23: Relay Output Setup Start screen
Setting up an analog output
About this task:
Analog outputs provide an analog signal to control equipment in your application based on the input from a standard
fixed setpoint sensor (Sn-1, Sn-2, or Sn-3) or a High Input Signal Selection sensor (HI-2 or HI-3).
Note: The differential sensor, Sn-d, is used to set up analog and relay outputs for Differential Control. See
Differential control for more information.
System 450 Series Control Modules with Analog Outputs Installation Guide14

Analog outputs provide an auto-selecting analog signal that is proportional to the sensed input condition.
The System 450 analog output senses the impedance of the controlled equipment’s analog input circuit and
automatically delivers either a 0–10 VDC or 4–20 mA signal to the controlled equipment.
Figure 24 shows an example of the analog output setup values and the resulting output signal in a typical space
heating application (SP > EP and OSP < OEP).
Figure 24: Control ramp example for a typical heating application (SP > EP and OSP < OEP)
The control action between the input signal and the output signal can be set up four ways, depending on the values
selected for the Setpoint (SP), End Point (EP), Percent Output Signal Strength at Setpoint (OSP), and Percent Output
Signal Strength at End Point (OEP). The LCD displays different Control Ramp icons for the four control actions. Table
6 shows the four Control Ramp icons and the associated analog output setup value relationships.
System 450 Series Control Modules with Analog Outputs Installation Guide 15

Table 6: Analog output control ramp icons
Control ramp displayed
on LCD Control action
Set the analog output value relationships for the
desired control action and control ramp
SP < EP
OSP < OEP
SP > EP
OSP < OEP
SP > EP
OSP > OEP
SP < EP
OSP > OEP
Setting up the Integration Constant, Update
Rate, and Output Deadband
About this task:
The System 450 Integration Constant (I-C), the Update
Output Signal Rate (UP-R), and the Output Signal Strength
Deadband (bNd) are powerful tools for controlling the
analog outputs and your application’s process loops.
Depending on your control system application, setting
up the I-C, UP-R, or bNd values to those other than
the factory-default values can significantly change the
behavior of an analog output. Refer to the System 450
Series Modular Control Systems with Standard Control
Modules Technical Bulletin (LIT-12011459) for more
information.
Important: If you set the I-C, UP-R, or bNd values
to something other than the default value, you
should operate and observe the affected analog
outputs and process loops through the entire range
of control. Failure to observe and adjust an analog
output set up to use the I-C, UP-R, or bNd features
can result in unexpected behavior and out of range
conditions in the affected process loops.
This section provides information, procedures,
guidelines, and screen examples for setting up
analog outputs on System 450 control modules. See
System 450 menu flow examples for example menu
flow of the Analog Output 3 set up in this section.
1. In the Analog Output Setup Start screen, press
Next to go to the output’s Sensor Selection
screen. The output numbers and the output type
(relay or analog) are determined by the module
types and configuration of your control system’s
module assembly and are automatically assigned
when you connect power to the module assembly.
(See Setting up a control system in the user
interface.)
Note: You must set up the system’s sensors
before you can set up the outputs.
The following figure shows the Analog Output
Setup Start screen for Output 3.
System 450 Series Control Modules with Analog Outputs Installation Guide16

Figure 25: Analog Output Setup Start screen
2. In the Sensor Selection screen, press Up or Down
to select the sensor that the output references:
- For standard control action, select Sn-1, Sn-2,
or Sn-3.
- For standard control action with High Input-
Signal Selection, select HI-2 or HI-3.
- For differential control action, select Sn-d.
The sensor you select here determines
the output’s setup parameters and values,
including condition type, unit of measurement,
minimum proportional band, default setup
values, and setup value ranges for several of the
remaining output setup screens. If a sensor is
not selected here, the output’s remaining setup
screens do not appear. If a sensor is already
selected for the output, the Sensor Selection
screen does not appear here, and the Setpoint
Selection (SP or dSP) screen appears instead.
Note:
- You must select a sensor in this Sensor
Selection screen and the selected sensor
must be already set up in the System 450
UI. (See Setting up System 450 Sensors.)
- On System 450 control modules, the
functional sensors Sn-d and HI-2 are
available if Sn-1 and Sn-2 are the same
Sensor Type. If Sn-1, Sn-2, and Sn-3 are
the same Sensor Type, the functional
sensor HI-3 is also available. The Binary
Input sensor is not available for analog
outputs.
Then press Next to save your sensor selection
and go to the Setpoint Selection screen.
In the following figure, the top screen example
shows the initial Sensor Selection screen for
Analog Output 3 before a sensor is selected.
The remaining screen examples show some of
the sensors that may be available for selection.
For the analog output example, Sn-1 is the
selected Sensor for Output 3 as shown in the
second screen.
Figure 26: Sensor Selection screen
3. In the Setpoint Selection screen for an analog
output that references Sn-1, Sn-2, Sn-3, HI-2, or
HI-3, press Up or Down to select the output’s
Setpoint value. The Setpoint is the target value that
the controlled system drives toward and, along
with End Point, defines the output’s proportional
band. Press Next to save your Setpoint value
selection and go to the End Point Selection screen.
Note: An output’s minimum proportional
band (between Setpoint and End Point) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
In the Differential Setpoint Selection screen
for an analog output that references Sn-
d, press Up or Down to select the output’s
Differential Setpoint value. The Differential
Setpoint (dSP) is the target value that the
controlled system drives towards and along
with Differential End Point (dEP), defines the
output’s proportional band. The dSP value is a
differential value that represents a (selected)
difference in the condition (temperature,
pressure, or humidity) between Sn-1 and
Sn-2 (Sn-1 minus Sn-2). Depending on the
intended proportional control action and the
physical location of Sn-1 and Sn-2 sensors in
the condition process, dSP may be a positive
or negative value. Press Next to save your
Differential Setpoint value selection and go to
the End Point Selection screen.
Note: The unit of measurement, resolution
increment, minimum proportional band, and
range of usable values for dSP and dEP are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.) The output’s minimum
proportional band (between dSP and dEP) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
In the following figure, the top screen example
shows a Setpoint value of 225 (psi) selected for
Output 3. The bottom screen example shows a
dSP value of 30 (psi) selected for Output 3.
System 450 Series Control Modules with Analog Outputs Installation Guide 17

Figure 27: Setpoint and Differential Setpoint Selection
screens
4. In the End Point Selection screen for an analog
output that references Sn-1, Sn-2, Sn-3, HI-2, or
HI-3, press Up or Down to select the output’s
End Point value. The End Point is the value that
the controlled system drives away from (toward
Setpoint) and, along with Setpoint, defines the
output’s proportional band. Press Next to save
your End Point value selection and go to the
%Output Signal Strength at Setpoint Selection
screen.
Note: An output’s minimum proportional
band (between Setpoint and End Point) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
In the Differential End Point Selection screen
for an analog output that references Sn-
d, press Up or Down to select the output’s
Differential End Point value. The Differential
End Point (dEP) is the target value that
the controlled system drives away from
(toward Differential Setpoint) and along
with Differential Setpoint (dSP), defines the
output’s proportional band. The dEP value is a
differential value that represents a (selected)
difference in the condition (temperature,
pressure, or humidity) between Sn-1 and
Sn-2 (Sn-1 minus Sn-2). Depending on the
intended proportional control action and the
physical location of Sn-1 and Sn-2 sensors in
the condition process, dEP may be a positive
or negative value. Press Next to save your
Differential End Point value selection and go
to the %Output Signal Strength at Setpoint
Selection screen.
Note: The unit of measurement, resolution
increment, minimum proportional band, and
range of usable values for dSP and dEP are
determined by the Sensor Type selected for
Sn-1 and Sn-2. (See Table 3 and Table 5 for
more information.) The output’s minimum
proportional band (between dSP and dEP) is
automatically enforced in the output’s Setpoint
and End Point Selection screens.
In the following figure, the top screen example
shows an End Point value of 235 (psi) selected
for Output 3. The bottom screen example
shows a dEP value of 25 (psi) selected for
Output 3.
Figure 28: End Point and Differential End Point Selection
screens
5. In the Output Signal Strength at Setpoint
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at Setpoint (OSP)
value. Select the strength of the signal that the
output generates when the sensed condition is at
the Setpoint value. The signal strength range is 0
to 100 (%). Press Next to save your selection and
go to the %Output Signal Strength at End Point
Selection screen.
The following figure shows an OSP value of 10
(%) selected for Output 3. Therefore Output 3
generates 10% of the total signal strength (1
V or 5.6 mA) when the input is at the Setpoint
value of 200 (psi).
Figure 29: Output Signal Strength at Setpoint Selection
screen
6. In the Output Signal Strength at End Point
Selection screen, press Up or Down to select the
output’s %Output Signal Strength at End Point
value. Select the strength of the signal that the
output generates when the sensed condition is at
the End Point value. The signal strength range is 0
to 100 (%). Press Next to save your selection and
go to the Integration Constant Selection screen.
The following figure shows an OEP value of 90
(%) selected for Output 3. Therefore Output 3
generates 90% of the total signal strength (9 V
or 18.4 mA) when the input is at the End Point
value of 250 (psi).
Figure 30: Output Signal Strength at End Point Selection
screen
7. In the Integration Constant Selection screen,
press Up or Down to select the output’s
Integration Constant for proportional plus integral
control. An integration constant allows you to set
up proportional plus integral control for this analog
output. Proportional plus integral control can drive
the load closer to Setpoint than proportional only
control. Press Next to save your selection and go to
the Output Update Rate Selection screen.
System 450 Series Control Modules with Analog Outputs Installation Guide18

Note: Initially, you should select the I-C value
of 0 (zero) for no integration constant. Refer
to the System 450 Series Technical Bulletin
(LIT-12011459) for more information on
proportional plus integral control and setting
an integration constant in the System 450 UI.
The following figure shows an I-C value of 0
(zero) selected for Output 3.
Figure 31: Integration Constant Selection screen
8. In the Output Signal Update Rate Selection
screen, press Up or Down to select the output’s
Output Signal Update Rate. Select the time interval
in seconds at which the output updates the
output signal strength. The selected Output Signal
Update Rate is the minimum time that the output
maintains a constant signal strength (regardless of
the input signal) before updating the output signal
in response to the referenced input signal. The
Output Signal Update Rate value range is 1 to 240
(seconds). Press Next to save your selection and go
to the Output Signal Deadband Selection screen.
Note: Beginning with firmware Version
4.00, the Output Update Rate is used to
reduce excessive cycling or repositioning
of controlled equipment, such as valve and
damper actuators. The Output Signal Update
Rate feature can be used in conjunction with
the Output Signal Deadband feature.
The following figure shows an Output Update
Rate value of 1 (second), which is the default
and lowest update rate you can select.
Figure 32: Output Signal Update Rate Selection screen
9. In the Output Signal Deadband Selection screen,
press Up or Down to select the output’s Output
Signal Deadband.
Select the Output Signal Deadband value (as a
percent of the output signal strength range) to
establish a deadband around the analog output
signal strength. The analog output responds
to a changing input signal and updates the
output signal strength whenever the input
signal moves outside of the selected Output
Signal Deadband.
At each update of the output signal, the control
determines if the calculated (input-induced)
output signal strength is within the selected
Output Signal Deadband or not. If the input-
induced change of the output signal strength
is within the selected Output Signal Deadband,
the output signal strength is not updated
and remains unchanged. If the input-induced
change of the output signal falls outside the
Output Signal Deadband, the output signal
strength is updated to the new signal strength
value and the selected Output Signal Deadband
is applied to the new signal strength value. The
Output Signal Deadband range is 0 to 50% of
the OSP to OEP range.
Press Next to save your selection and go to the
Sensor Failure Mode Selection screen.
Note: Beginning with firmware Version
4.00, the Output Signal Deadband is used
to reduce excessive cycling or repositioning
of controlled equipment, such as valve and
damper actuators.The Output Signal Deadband
feature can be used in conjunction with the
Output Signal Update Rate feature.
The following figure shows an Output
Deadband value of 0 (%), which is the default
value and disables the Output Deadband
feature.
Figure 33: Output Signal Deadband Selection screen
10. In the Sensor Failure Mode Selection screen,
press Up or Down to select the output’s mode of
operation if the sensor or sensor wiring fails.
Select the output’s mode of operation if a
referenced sensor or sensor wiring fails. For
outputs that reference functional sensors
HI-2, HI-3, or Sn-d, the failure of any of the
referenced hard-wired sensors results in a
functional sensor failure condition. The output
operates in the selected Sensor Failure mode
until the failure is remedied. Sensor Failure
mode selections for analog outputs include:
-ON = Output generates the selected OEP
signal strength during sensor failure.
-OFF = Output generates the selected OSP
signal strength during sensor failure.
Press Next to save your selection and go to the
Edit Sensor Selection screen.
The following figure shows OFF selected as the
Sensor Failure mode for Output 3.
Figure 34: Sensor Failure Mode Selection screen
11. In the Edit Sensor Selection screen if you are not
changing the output’s sensor, press Next to save
the current sensor selection and return to the
Analog Output Setup Start screen.
To change the sensor the output references,
press Up or Down to select the new sensor
System 450 Series Control Modules with Analog Outputs Installation Guide 19

that the output references. Then, press Next
to save the new sensor selection and return to
the Setpoint Selection screen (SP or dSP). If the
new sensor has a different Sensor Type from
the previously referenced sensor, repeat the
output setup procedure for the output.
Note: If you change the sensor that an output
references to a sensor with a different Sensor
Type, the default setup values for the output
change, and you must set the output up again.
The following figure shows Sn-2 as the selected
Sensor for Output 3.
Figure 35: Edit Sensor Selection screen
12. After you have set up this analog output, you
can go to another setup screen or return to the
main screens. In the Analog Output Setup Start
screen, press M to scroll through the remaining
Output Setup Start screens or the Backlight
Brightness Setup Start screen, or press Up and
Down simultaneously to return to the System 450
Main screens.
The following figure shows the Analog Output
Setup Start screen for Output 3.
Figure 36: Analog Output Setup Start screen
Setting up the LCD backlight brightness
About this task:
Beginning with firmware version 4.00, the LCD backlight
brightness can be adjusted in the UI. This section provides
information, procedures, guidelines, and screen examples
for setting up the backlight brightness on System 450
control modules. See System 450 menu flow examples for
example menu flow of the backlight set up in this section.
1. In the Backlight Setup Start screen, press Next to
go to the Edit Backlight Low Level screen.
Figure 37: Backlight Setup Start screen
The Backlight Brightness level feature allows
you to adjust the backlight intensity. The
selected backlight low level value is applied
when the control is in idle mode. When you
enter the programming menus to set up the
control or press any key, the LCD automatically
goes to the selected backlight high level value.
2. In the Backlight Low Level screen, press Up
or Down to select the backlight brightness low
level value. The backlight low level defines the
brightness of the backlight during regular or idle
mode, when you are not making adjustments to
the control. Press Next to save your selection and
go to the Edit Backlight High Level screen. The
following figure shows the Backlight low level set to
OFF.
Figure 38: Backlight Low Level screen
3. In the Backlight High Level screen, press Up
or Down to select the backlight brightness high
level value. The high level defines the brightness
when you are making configuration changes to the
control and interacting with the UI. The backlight
high level can be set to values 1 through 10; it
cannot be turned completely off. Press Next to
save your selection and return to the Backlight
Setup Start screen. The following figure shows the
Backlight high level set to 10.
Figure 39: Backlight High Level screen
4. After you have set up the backlight brightness
level, you can go to the Sensor Setup Start screen
or return to the main screens. In the Backlight
Setup Start screen, press M to return to the
Sensor Setup Start screen, or press Up and Down
simultaneously to return to the System 450 Main
screens.
Figure 40: Backlight Setup Start screen
System 450 Series Control Modules with Analog Outputs Installation Guide20