Control Technologies 2646 MultiPro User manual

25 South Street, Hopkinton, MA 01748
This guide contains installation and applications information for the
MultiPro MC Dual Servo Automation Controller.
You program the MultiPro MC Dual Servo controller using CTCs state
programming language, uickstep for Windows. Using either an
RS-232 interface, you can run all programming and diagnostic functions
for the controller from your PC, as well as using them as a computer
communications port.
This guide is divided into the following sections:
Dimensions and Mounting Instructions for the MultiPro Controllers .... 2
Controller Description and Connections ................................................. 3
MultiPro MC Dual Servo Specifications ................................................. 6
MultiPro MC Dual Servo Power Connections ...................................... 10
Status Light Description......................................................................... 11
Connecting Digital Inputs ...................................................................... 12
Connecting Digital Outputs ................................................................... 13
Connecting and Programming Analog Inputs ........................................ 16
Connecting and Programming Analog Outputs ..................................... 20
Setting-up RS-232 Controller Communications .................................... 21
Programming a Servo ............................................................................. 23
Setting Up Registration for a Servo ....................................................... 30
Setting Up Electronic Following for a Servo ........................................ 36
Servo Hardware Considerations ............................................................ 39
Sample uickstep Programs .................................................................. 41
Special Purpose Registers for Servos .................................................... 46
Model 2646 MultiPro MC Dual
Servo Automation Controller
Copyright 1997 Control Technology Corporation. All rights reserved. Printed in USA.
This document is current as of the following revision levels:
Controller Firmware - 2.12
Controller Hardware - A
Control
Technology
Corporation
Installation Guide

2Model 2646 MultiPro MC Dual Servo Installation
Guide
Dimensions and Mounting Instructions for the MultiPro Controllers
The MultiPro has mounting ears, allowing it to be easily mounted to a flat surface (for
example, an NEMA-rated electrical enclosure) with four mounting bolts. You should
follow the guidelines described in this installation guide to ensure a successful design.
Mounting Considerations
When selecting a mounting location for the controller, care should be taken to provide
protection against various environmental factors:
The controller should not be exposed to flying metal chips (be careful during instal-
lation and subsequent machine construction work.), conductive dusts, liquids or
condensing humidity. In environments where these hazards may be present, the
controller should be housed in an NEMA 4 or NEMA 12 rated enclosure, as appro-
priate.
The controller is not intended for mounting in an environment requiring explosion
proof practices.
If possible, the controller should be mounted physically distant from devices produc-
ing electromagnetic interference (EMI) or radio frequency interference (RFI). This
includes motor starters, relays, large power transformers, ultrasonic welding appara-
tus, etc.
The following illustration shows the dimensions of your MultiPro controller
4.70 in
(119.4 mm)
5.90 in
(149.9 mm)
5.30 in
(134.6 mm)
4.00 in
(101.6 mm)
5.50 in
(139.7 mm)
MPDIMS
R0.10 in (2.54 mm)
Ref Point
R0.19 in (4.83 mm)
0.30 in
(7.62 mm)
Mounting Ear Detailed View
(use 4 mounting bolts)

3
Control Technology Corporation
+24V
+5V
STAT
24 VDC IN
GND
1
5
9
13
INPUTS
1
5
9
13
OUTPUTS
COMM
RS-232
REF
GND
1+
GND
2+
3+
GND
4+
5+
GND
6+
7+
GND
8+
GND
01
03
05
07
GND
REF
GND
1-
GND
1-
3-
GND
4-
5-
GND
6-
7-
GND
8-
GND
02
04
06
08
GND
ANALOG I/O
1
5
DEDICATED
OUTPUTS
1-2
3-4
5-6
7-8
RET
RET
+24
+24
1
2
C
O
M
M
A
N
D
S
E
N
C
O
D
E
R
S
1
2
1
2
I
N
P
U
T
S
KILL
FLIM
RLIM
STOP
HOM
REG
KILL
FLIM
RLIM
STOP
HOM
REG
TM
MultiPro MC Dual Servo
2646F1
Controller Description and Connections
Po er connector: Provides
24 VDC to the controller.
Po er indicator: This light
is lit hen the po er is on
hether or not the
controller is in operation. It
also indicates that the logic
supply is present.
Status light: Indicates
soft are or hard are
faults. Refer to the section
Status Light Description for
additional information.
Digital input connector:
Provides access to the 16
inputs. Inputs are numbered
1 through 16.
Digital output connector: Provides
access to 16 of the controllers 24
outputs. The outputs are
numbered 1 thought 16.
Led indicators: Each
digital input and output has
an LED indicator. An LED
indicator lights up hen its
associated input or output
is active.
Servo command connector: Provides
access to the analog output for
commanding a servo drive and the relay
outputs for enabling a servo drive.
Servo encoder connectors:
Provides a connection to
the quadrature encoders.
Dedicated input connectors:
Provides access to the 6
dedicated inputs on the servo
board as ell as, providing
+24 for po ering external
sensors.
RS-232 channels: Provides
both programming and
data communications via a
personal computer using
Quickstep and CTCMON.
Refer to the section,
Setting up RS-232
Controller Communications
for more information
Dedicated digital output
connector: Provides
access to the digital
outputs. The dedicated
digital outpus are mapped
one-to one ith the analog
inputs.
Analog input/output
connector: Provides
access to the analog inputs
and outputs.
Led indicators: Each
digital input and output has
an LED indicator. An LED
indicator lights up hen its
associated input or output
is active.

4Model 2646 MultiPro MC Dual Servo Installation
Guide
Controller Description and Connections
Pin 1 Pin 2
Pin 25 Pin 26
2647P2
Pin 1 Pin 2
Pin 33 Pin 34
2647P1
Pin No. Signal Pin No. Signal
1 Input 1 2 Return
3 Input 2 4 Return
5 Input 3 6 Return
7 Input 4 8 Return
9 Input 5 10 Return
11 Input 6 12 Return
13 Input 7 14 Return
15 Input 8 16 Return
17 Input 9 18 Return
Pin No. Signal Pin No. Signal
1 Output 1 2 Output 14
3 Output 2 4 Output 15
5 Output 3 6 Output 16
7 Output 4 8 Return
9 Output 5 10 Return
11 Output 6 12 Return
13 Output 7 14 Return
Pin No. Signal Pin No. Signal
19 Input 10 20 Return
21 Input 11 22 Return
23 Input 12 24 Return
25 Input 13 26 Return
27 Input 14 28 Return
29 Input 15 30 Return
31 Input 16 32 Return
33 +24 VDC 34 Return
Digital Input Connector Wiring
Pin No. Signal Pin No. Signal
15 Output 8 16 No pin
17 Output 9 18 +24 VDC
19 Output 10 20 +24 VDC
21 Output 11 22 +24 VDC
23 Output 12 24 +24 VDC
25 Output 13 26 N/C
Digital Output 1-16 Connector Wiring
Pin 1
Pin 39
Pin 2
Pin 40
2644P2
2644P1
Pin 1
Pin 15
Pin 2
Pin 16
Pin No. Signal Pin No. Signal
1 10 V ref 2 10 V ref
3 Return 4 Return
5 A input 1+ 6 A input 1-
7 Return 8 Return
9 A input 2+ 10 A input 2-
11 A input 3+ 12 A input 3-
13 Return 14 Return
15 A input 4+ 16 A input 4-
17 A input 5+ 18 A input 5-
19 Return 20 Return
Dedicated Digital Outputs 1-8 Connector Wiring
Pin No. Signal Pin No. Signal
1 D output 1 2 D output 2
3 D output 3 4 D output 4
5 D output 5 6 D output 6
7 D output 7 8 D output 8
9 Return 10 Return
11 Return 12 Return
13 +24 VDC 14 +24 VDC
15 +24 VDC 16 +24 VDC
Pin No. Signal Pin No. Signal
21 A input 6+ 22 A input 6-
23 A input 7+ 24 A input 7-
25 Return 26 Return
27 A input 8+ 28 A input 8-
29 Return 30 Return
31 A output 1 32 A output 2
33 A output 3 34 A output 4
35 A output 5 36 A output 6
37 A output 7 38 A output 8
39 Return 40 Return
Analog Input/Output Connector Wiring

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Control Technology Corporation
2219P3
Pin1 Pin 2
2219P1
Pin 1
Pin 5
2219P2
Pin 9
Pin 1
Servo Command Connector Wiring
Pin No. Connection
5 An log comm nd output
4 An log comm nd return
3 Drive kill rel y (norm lly open)
2 Drive kill rel y common
1 Shield
Servo Encoder Connector Wiring
Pin No. Connection
1 Ch nnel A+
2 Ch nnel A-
3 Not used
4 Not used
5 Index -
6 5 VDC return
7 +5 VDC for encoder
8 Ch nnel B+
9 Ch nnel B-
10 Index +
Servo Dedicated Input Connector Wiring
Pin No. Connection
1Strt
2 Kill comm nd
3 Forw rd limit
4 Reverse limit
5 Home
6 Registr tion input
7 +24 VDC
8 +24 V return
Contact shape
for command
input connector
CNT1
Contact shape
for encoder
connector
CNT3
Contact shape
for dedicated
input connector
CNT2

6Model 2646 MultiPro MC Dual Servo Installation
Guide
C U Specifications
CPU Characteristics Min Typ Max
Ambient Temperature
operating 0 50 °C
storage -20 80 °C
Voltage Range 22 24 27 VDC
Current Requirement@ 24VDC .2 .3 Amp
CPU Power Requirements (5V) 0.2 0.25 Amp
User Memory Capacity (11 yr. Lithium-cell RAM) 24K Bytes
These controllers use a 80C196 processor running at 18.432 MHz
CPU Typical Performance Specifications Typ
Sense input, jump to new step, change output 1 ms
Perform multiplication (between volatile registers) 1 ms
Time delay duration, 10 ms programmed 11.0 ms
Time delay duration, 1 . programmed 1.002 sec
Internal count rate
up to 3 inputs being counted 500 Hz
4 to 6 inputs being counted 250 Hz
7 to 9 inputs being counted 166 Hz
Note: Performance specifications shown are with one task running. RS-232 communications may
degrade count by up to 10%.
Controller Resource Summary
Multi-Tasking (number of tasks) 28
Volatile Registers (32-bit) 488
Non-Volatile Registers (32-bit) 500
Data Table Elements (16-bit, Nonvolatile) 8000
Input-linkable Counters 8
Flags 32
Program Steps 1024
Servo Specifications
Abosolute Maximum Ratings Min Max
Command load resistance 2 kΩ
Encoder input voltage 0.0 +5.0 VDC
Encoder (+5 V.) supply output current 500 mA
(total - both axes)
Ambient temperature (operating) 0 50 °C
Specifications Min Typ Max
Command outputs nominal voltage range -10.0 +10.0 VDC
Differential encoder inputs
Nominal input range 0.0 +5.0 VDC
Open-circuit voltage (Ii = 0 mA) 5.0 5.38 VDC
Logic-low current (Vi = 0 V.) 1.1 1.2 mA
Auxiliary Inputs (except Registration)
Off voltage (Ii = 0 mA) - Note 2 24.0 26.4 VDC
On current (Vi = 0 V.) 2.12 mA
MultiPro MC Dual Servo Specifications

7
Control Technology Corporation
Servo Specifications cond.)
Threshold
low-to-high 14.0 VDC
high-to-low 12.5 VDC
Registration Auxiliary Input
Off voltage (Ii = 0 mA) 24.0 26.4 VDC
On current (Vi = 0 V.) 2.28 mA
Threshold
low-to-high 5.1 VDC
high-to-low 4.9 VDC
Performance Specifications Min Typ Max
Maximum velocity setting 1 4,000,000 Steps/sec
Resolution of max. velocity setting 1 Steps/sec
Accel and decel settings 1 130,000,000 Steps/sec2
Resolution of accel/decel setting 1 Steps/sec2
Position range (absolute mode) -2,147,483,648 2,147,483,647 Steps
Relative motion command range -2,147,483,648 2,147,483,647 Steps
Position registration accuracy +1 Count
Notes:
1. Specifications shown above are at 25° C., unless otherwise noted.
2. Dependent on controller auxiliary supply voltage (24 V. typ).
3. PID parameters are programmed as relative values in the range of 0 to 255. Acceleration (Aff) and
Velocity feedforward (Vff) range from 0 to 32767.
4. In Performance Specifications, the term Step refers to one edge transition on either encoder input for
that axis.
5. Ratio Range for both axis following and ratio control is +1 to 32767 minimum and +32767 to 1
maximum. Depending on the application, high ratios may result in
instability.
Analog Input/Output Specifications
Absolute Maximum Ratings Min Max
Maximum analog input voltage +15 VDC
Minimum analog output load resistance 2.0 kΩ
Maximum output current
Precision 10 volt reference output 25 mA
Digital outputs (per output 500 mA
Analog isolation - voltage withstand (one minute duration max.) 1500 volts
Analog Output Specifications Min Typ Max
Output voltage range -10.000 10.000 VDC
Output resolution 2.44 mV
Output settling time
-10.000 to +10.000 V .2 ms
0 to 5.000 V .1 ms

8Model 2646 MultiPro MC Dual Servo Installation
Guide
Analog Input/Output Specifications cond.)
Analog Input Specifications Min Typ Max
Differential input range -10.000000 +10.000000 VDC
Common mode voltage range -10 +10 VDC
Input resistance 10 MW
Input resolution (15 bit) .00305 %FS
Input accuracy .00305 %FS
(25 °C, 8-sample filtering)
Input conversion time 2.083 ms
(asynchronous)
Input filter settings 2.083 533.248 ms
(default = 1 sample)
Threshold triggering response 2.25 ms
(Analog input to digital output response)
Dedicated Digital Output Specifications Typ Max
On voltage (Io = 500 mA) .6 1.2 VDC
Off leakage (applied V = 24 VDC) 1 100 µA DC
Maximum output current*500 mA DC
*All digital outputs are short circuit and over-current protected.
Digital Input/Output Specifications
Input/Output Absolute Maximum ratings Min Typ Max
Applied input voltage 0 27.0 VDC
Applied output voltage 0 24.0 VDC
Output Current
Single output 500 mA DC
Total limit 5 Amp DC
Digital Output Specifications Outputs 1 -16) Typ Max
Output on voltage (Io = 500 mA) 0.8 1.8 VDC
Output off leakage (applied V = 24 V) - Note 3 0.01 0.75 µA
Digital Input Specifications Min Typ Max
Input off voltage (Ii = 0 mA) 24.0 26.4 VDC
Input on current (Vi = 0 V) -2.10 -2.85 mA
Input on current threshold (Vi = 8 V typ) -1.0 -1.85 mA
Input off current -250 µA
(typ leakage current allowable)
Notes:
1. Under normal operation, no external input voltage is applied  inputs should be externally switched
to the input common.
2. An on-board protection diode returns to +24 V from each output.
3. In the off state, unconnected outputs are internally pulled to +5 V through a diode and an LED
indicator.
4. All Power Requirements are worst-case, with all inputs and/or outputs activated.
5. Specifications shown above are at 25° C., unless otherwise noted.
MultiPro MC Dual Servo Specifications

9
Control Technology Corporation
RS-232 Specifications
Absolute Maximum Ratings Max
Current draw from on-board +5 V supply 110 mA (DC)
Operating Characteristics Min Typ Max
RS-232 Transmitters 9 12 V DC
RS-232 Receivers 3 12 V DC
Notes: Specifications shown above are at 25° C., unless otherwise noted.

10 Model 2646 MultiPro MC Dual Servo Installation
Guide
MultiPro MC Dual Servo Power Connections
Connecting DC ower
The MultiPro MC Dual Servo contains an internal power supply which provides a +5
VDC isolated voltage for the operation of the controller.
The controllers power supply requires 24 VDC for proper operation. Power is applied
to the controller via the power connector on the top of the controller. The controllers
power system derives its operating voltage from the external 24 volt supply.
GND
PW1
Internal
24V
Power
Supply
Line
External
300 mA + Output
Load Requirements
24 VDC In
The Importance of roper Grounding
As with any electronic equipment, the controllers ground should follow a direct, low-
impedance path to the plants power source. If possible, this path should not be share by
any machinery which injects a large amount of electrical noise into the ground.
For further consideration regarding noise protection, refer to the Application Note,
Re ucing Noise Susceptibility. Application notes may be obtained at no charge from
your distributor or directly from CTC.

11
Control Technology Corporation
Status Light Description
The status light on the MultiPro can indicate one of the following conditions:
Software fault: A periodic flashing light on the MultiPro indicates a program
software fault. This means the controller was unable to execute due to an applica-
tion problem within the program. To determine what type of software fault has
occurred, you can view the program status using uickstep for Windows program
monitoring utility, CTCMON.
If a program software fault occurs, the controller is idle and all setable resources,
such as outputs, registers or flags, are left in the state they were in prior to the
software fault. You can program register 13009 to turn off a specific output in the
event of a software fault. Refer to the list of special purpose registers for more
information.
Hardware fault: A steady red light indicates that the internal watch dog timer has
disabled the controllers CPU. If this occurs, the controllers outputs are also
disabled. Try cycling the power, re-downloading your uickstep program, or both.
If the fault continues, your controller may have to be returned to Control Technology
Corp. for repair. For further details, contact our Technical Support department
before returning your controller.
When powering-up the controller, the status light is a steady red light during the first
second of operation.

12 Model 2646 MultiPro MC Dual Servo Installation
Guide
Connecting Digital Inputs
The 16 digital inputs require only a switch closure to the Return (the common for the
controllers 24 Volt supply) to actuate. Each input is internally self-powered from the 24
Volt power supply through a current limiting resistor, and is optoisolated from the
controllers logic.
Input
Input
Input
Digital Inputs
DI1
The controller senses when any of the inputs have been pulled down to return by a
switch closure, and a Monitor instruction or any other programmed instruction referring
to a general-purpose input can use this information.
Using Solid State Sensors
You can connect many types of electronic sensors to the inputs. You can connect three
wire Hall-effect sensors, proximity sensors, and phototransistors without any additional
circuitry. These devices should be specified as having sinking-type open-collector
outputs (NPN) and must be capable of withstanding at least +24 volts on their output
terminals when in the off state. The sensor must also be able to sink the required input
current, i.e., 2.1 mA, when on.
NOTE: Do not use two-wire solid state sensors.
Electronic sensors typically require an external power source for powering their internal
circuitry. The following illustration shows how to connect a solid state sensor.
Digital
Input
Hall-Effect
Sensor
+ 24 VDC
Return
Input
Out
+
-
DI2

13
Control Technology Corporation
Connecting Digital Outputs
Using Open-collector Outputs
The MultiPro MC Dual Servo provides 24 outputs for driving external loads, such as
solenoid valves, indicators, solid-state relays and other low-power DC loads. These
outputs are in the form of open-collector transistors capable of switching loads up to 0.5
Amp DC
This type of output gets its name from the fact that the collector terminal of the output
transistor is left open, or unconnected, to allow greater flexibility in its use.
An open-collector output, shown schematically below, performs roughly the same
function as a switch contact with one side of the switch connected to ground. When the
output is turned off, no current can flow through the transistor. This is the equivalent of
the switch contact being open, because the device being controlled is turned off.
Main +24 V
Power Supply +
Open-Collector
Transistor Solenoid
+ 24 VDC
Output
-
+
Power Supply
Input Connector
Base 1N4004
Diode
-
DI3
When the output is turned on, current is allowed to flow through the transistor, just as
though a switch contact had been closed. The controlled device turns on in response to
the flow of current.
To connect a device to an open-collector output, one terminal of the device is connected
to the open-collector output (if the device is polarized, the negative [-] terminal is
connected to the output). The remaining terminal of the device is connected to the
positive side of the power supply.
IMPORTANT! Control Tech recommends that you place a suppression diode across inductive loads.
Use a 1N4004 diode or equivalent. The diode should go as close to the load as pos-
sible, as shown in the illustrations.
Care should be taken not to exceed the rated current of the power supply being used.
When calculating the current requirements of your system, you only need to consider the
maximum number of output devices to be turned on simultaneously plus .3 AMPs for the
MultiPro+ in your calculation.

14 Model 2646 MultiPro MC Dual Servo Installation
Guide
Connecting Multiple devices
When powering multiple devices from the same power source, each device is connected
with one of its leads attached to an independent output, and the other lead connected to
the positive terminal of the power source. The following diagram shows four solenoid
valves being controlled by outputs 1 through 4. All outputs are powered by the power
supply which is powering the controller.
Solenoid
Controller
+24 VDC
Output 2
Output 3
Output 4
1N4004 Diode
Output 1
DI4
Connecting to a Second External Power Supply
It is also possible to power some of the devices from a second external power supply,
while powering others from the supply powering the controller. To do this, you must
connect each device being controlled to the positive terminal of the appropriate power
supply. Refer to the diagram on the next page. When connecting to an external power
supply, do not to connect the positive terminals of the two supplies together, either
directly or indirectly.
IMPORTANT! Control Tech recommends that you place a diode across inductive loads. Use an
IN4004 diode or equivalent. The diode should go as close to the load as possible, as
shown in the illustrations.
Controller Outputs
-+
Solenoid
Output
External
Power Supply
Return
Main +24 V
Power Supply --
Power Supply
Input Connector
+
+
1N4004 Diode
DI5
Cathode of
Protection
Diode
Connecting Digital Outputs

15
Control Technology Corporation
WARNING: Each output has a protection diode with its cathode connected to the + 24 VDC power
supply at the input connector. This diode prevents damage to the output when connected
to an inductive load. If a separate power supply is used for the external devices, as
shown above, a current path exists between the two supplies through the devices being
controlled. Under normal operation this practice is okay. However some power supplies
when powered down, tend to offer a low impedance with respect to power supply return.
If in the above configuration, the main power supply is powered down and the external
one is not, the current from the external supply can energize the device connected to the
output, turning it on. To prevent this, make sure that both supplies are powered up and
down together.
-+
Solenoid
Output 1
Second
External
Power Supply
Return
+24 VDC
Output 2
Output 3
Output 4
Controller
Output 5
Main +24 V
Power Supply --
Power Supply
Input Connector
+
+
1N4004
Diode
DI6
IMPORTANT! Do not use an external power supply with an output voltage greater than the output
voltage rating of the outputs.
Do not connect the positive [+] terminals of the power supplies together! Damage to one
of the supplies may result.
Notice, in the diagram above, the connection between the negative [-] terminal of the
external power supply and the return terminal on the controllers output connector. This
is necessary to provide a complete circuit for the current travelling through the device
being controlled.

16 Model 2646 MultiPro MC Dual Servo Installation
Guide
Connecting Analog Inputs
All analog inputs are optically-isolated from the controller CPU logic to reduce ground-
looping and increase noise immunity. These illustrations show wiring configurations for
the following connections:
A differential signal
A single-ended signal
 A potentiometer
Connecting a Differential Signal
Analog Device Analog Input +
Analog Input -
Analog Inputs
2220-4
NOTE: All shields are located on the controller side and run to ground.
Connecting a Single-ended Signal
Analog Device Analog Input +
Analog Input -
Analog Inputs
2220-5
Analog Ground
Connecting to a Potentiometer
5 kΩ
Potentiometer Analog Input +
Analog Input -
Analog Inputs
2220-6
Analog Ground
10 VDC Reference
Connecting and Programming Analog Inputs

17
Control Technology Corporation
Specifying Digital Filter Length
Use registers 18501-18508 to specify the digital filter length for the MultiPros analog
inputs. Enter a value in one of these registers to specify the total number of samples
processed by the MultiPro. These samples are continuously averaged for use in your
uickstep program. The default value is 1, or unfiltered. A single sample period for an
analog conversion is 2.0833 ms. CTC recommends that you set the filter length value to
8 (2.0833 * 8 = 16.67 ms, or a 60 Hz rate). If the value is set to 8 or a multiple of 8, it
helps reject any 60 Hz noise that may be present on your system.
NOTE: The analog inputs are designed to operate asynchronously. This allows you to specify
larger filter lengths without affecting the controllers performance.
Setting Up Input Thresholds
You can configure each analog input to control an associated digital output that is based
on reaching pre-defined setpoints. The digital outputs are mapped one-to-one with the
analog inputs. When an analog input reaches a pre-defined setpoint value, the controller
turns the associated digital output ON or OFF.
You can dynamically adjust the setpoints from your uickstep program by using
CTCMON or with an operator interface. The dedicated digital outputs are configured as
open-collector transistors that are available for driving DC loads. Each output can handle
up to 0.5 A and provides overcurrent and short-circuit protection.
Registers 19001-19008 and 19501-19508 set the threshold setpoints for the dedicated
digital outputs. The way they are used depends on how you want to control the output.
For example, the illustration below shows that the first output remains OFF until the
voltage level on analog input 1 meets or exceeds 6 VDC. If the voltage falls below 4
VDC, the output turns back OFF. In this example, the hysteresis area ranges between
4-6 VDC to prevent the output from toggling ON or OFF when the voltage reaches the
edge of the setpoint.
6.000 VDC
4.000 VDC
Register 19501 = 6,000,000
Register 19001 = 4,000,000
Output On
Output Off
Hysteresis Area
2220-2

18 Model 2646 MultiPro MC Dual Servo Installation
Guide
The next example shows that the first output remains ON until the voltage level on analog
input 1 meets or exceeds 6 VDC. If the voltage falls below 4 VDC, the output turns back
ON. In this example, the hysteresis area ranges between 4-6 VDC to prevent the output
from toggling ON or OFF when the voltage reaches the edge of the setpoint.
6.000 VDC
4.000 VDC
Register 19001 = 6,000,000
Register 19501 = 4,000,000
Output Off
Output On
Hysteresis Area
2220-3
The program sample below configures analog input 1. When the value exceeds 3 VDC,
digital output 1 turns ON. When the value falls below 2.5 VDC, the output turns OFF.
This process is handled locally and does not affect the uickstep programs execution
time.
[10] DIGITAL_OUTPUT_THRESHOLDS
;;;
;;; Register 19001 sets the minimum threshold for analog
;;; input 1 as 2.500000. Register 19501 sets the maximum
;;; threshold for analog input 1 as 3.000000.
;;;
------------------------------------------
<NO CHANGE IN DIGITAL OUTPUTS>
------------------------------------------
store 2500000 to Reg_19001
store 3000000 to Reg_19501
goto next
Your uickstep program can check the status of an output at any time. The dedicated
outputs are accessed through registers 18001-18008, which have read/write capability.
A value of 0 indicates that the output is OFF and a 1 means it is ON. You can use an IF
instruction to determine the outputs ON/OFF state. You can also toggle the output ON or
OFF by storing a 0 or 1 to the approriate register.
In the following example, the program jumps to the next step when dedicated output 1 is
ON.
[56] CHECK_DEDICATED_OUTPUT
;;;
------------------------------------------
<NO CHANGE IN DIGITAL OUTPUTS>
------------------------------------------
if Reg_18001=1 goto next
Connecting and Programming Analog Inputs

19
Control Technology Corporation
The following example turns on dedicated output 3 and turns off output 8.
[446] CHANGE_DEDICATED_OUTPUTS
;;;
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<NO CHANGE IN DIGITAL OUTPUTS>
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store 1 to eg_18004
store 0 to eg_18008
goto next
Disabling the Thresholding Feature
You can disable the thresholding feature in one of the following ways:
1. Store a number greater than 10,000,000 to register 19501 (for analog input 1) or to
register 19508 (for analog input 8).
2. Store a number less than -10,000,000 to register 19001 (for analog input 1) or to
register 19008 (for analog input 8).
Alternate Access to Analog Inputs
Registers 8501-8508 provide alternate access to the analog inputs. All values are
expressed in millivolts and can range from -10,000,000 to +10,000,000 (-10 to +10
VDC). The following example checks the value on an analog input and proceeds to the
next step if the value is greater than 9.150000 VDC:
if Reg_8504>9150000 goto next

20 Model 2646 MultiPro MC Dual Servo Installation
Guide
Connecting and Programming Analog Outputs
Connecting Analog Outputs
The MultiPro has eight bipolar (+10 volts) analog outputs with a resolution of 13 bits.
The following illustration shows the wiring configurations for an analog output:
Analog Device Analog Output
Analog Outputs
2220-7
Analog Ground
NOTE: All shields are located on the controller side and run to ground.
Alternate Access to Analog Outputs
Registers 8001-8008 provide alternate access to the analog outputs. The following
examples check the value on an analog output and change the value of an output. All
values are expressed in millivolts.
The following example checks the value of analog output 1 and proceeds to the next step
when the value is reached:
if eg_8001 > 1259 goto TU N_OFF_VALVE
This example has the controller send 4.500 VDC out analog output 6.
store 4500 to eg_8006