t.a.c. MPC-8AI Instruction sheet

Printed in U.S.A. 10/06 © Copyright 2006 TAC All Rights Reserved. F-24853-4
TAC
1354 Clifford Avenue
P. O. Box 2940
Loves Park, IL 61132-2940
www.tac.com
Application
The analog input module (MPC-8AI) is an expansion
module that plugs directly into any of the four option
slots available on the TAC MicroSmart Multi-purpose
Controller (MSC-MPC), providing additional analog
inputs to the MSC-MPC.
The MPC-8AI provides eight universal analog inputs
that can be configured as 1000 ohms Balco, 1000 ohm
platinum, 4-20 mA, 0-11 Vdc sensors, or status contact
inputs.
SPECIFICATIONS
Model No. MPC-8AI.
Agency Listings:
UL-916, Energy Management Equipment.
UL-873, Temperature Indicating and Regulating
Equipment.
UL-864, Smoke Control System Sub-assembly.
Complies with FCC Class “A” requirements.
Warning: Listed as a smoke control system sub-assembly.
Not to be used by itself or as part of a TAC MicroSmart
Control Network (RCM/NCM) in a smoke control application.
For smoke control applications, install in accordance with F-
25645, “TAC DMS Smoke Control Systems Manual”.
Analog Inputs: 8 universal inputs individually configurable
for any of the following:
1000 Ohm Platinum Temperature Sensor, -40 to +240
°F @0.1 °F resolution (-40 to 115 °C @ 0.06 °C
resolution).
1000 Ohm Balco Temperature Sensor, -28.6 to +240
°F @ 0.1 °F resolution (-33.6 °C to +115 °C @ 0.06 °C
resolution).
0-11 Vdc, 0.005 volt resolution.
4-20 mA, 0.01 mA resolution.
Contact Inputs, Used for status monitoring of dry
contacts.
Operating Environment: 32 to 122 °F (0 to 50 °C), 5-85%
RH (non-condensing).
Power Requirements: MPC-8AI derives all operating
power from associated MSC-MPC.
Dimensions: 5” x 6.25".
Weight:
Net, 12-1/2 oz.
Shipping Weight, 13 oz.
MPC-8AI
Multi-Purpose Controller
Analog Input Module
Installation Guidelines
FCC Guidelines
This equipment has been tested and found to comply with the
limits for a Class “A” digital device, pursuant to Part 15 of the
FCC rules.
These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated
in a commercial environment. This equipment generates,
uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual
may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Pre-Installation
Warning: To reduce risk of fire or electrical shock, install in
a controlled environment relatively free of contaminants.
Before beginning the installation process for the MPC-8AI,
visually inspect the unit for any obvious defects and to make
sure all parts are included. If any flaws are detected, contact
your local TAC office or authorized representative
immediately.

2© Copyright 2006 TAC All Rights Reserved. F-24853-4
Figure-1 TAC MicroSmart MPC-8AI Analog Input Module.

F-24853-4 © Copyright 2006 TAC All Rights Reserved. 3
Programming information is contained in this document. For
further details regarding software configuration, please refer
to the appropriate User’s Guide and the TAC MicroSmart
Operator Interface User’s Guide.
Included in This Package
The MPC-8AI is supplied with:
1. One N1-1092 MPC-8AI module circuit board.
2. Two 8-pin connectors (green, N100-410659), for
connection to analog inputs AI1-AI8.
Other Components
The MPC-8AI requires direct connection to a TAC MicroSmart
MSC-MPC Multi-purpose controller.
Options and Accessories
TS-5800 and TS-58000 series platinum RTD room
thermostats and remote sensors, and TS-8100 and TS-81000
series Balco sensors. See separate platinum RTD room
sensor data sheet for special models using RJ-11 jacks,
adjustable setpoints, and pushbutton/LED overrides.
Power Requirements
The MPC-8AI is powered on when connected to a functional
MSC-MPC. No additional power is required.
Caution: Disconnect power supply from associated MSC-
MPC controller before installing MPC-8AI to prevent electrical
shock and equipment.
More than one disconnect switch may be required to de-
energize this equipment before servicing.
Do not attempt to power the unit ON until installation is
complete.
Installation
The MPC-8AI is a module that fits into any of the four option
slots on the MSC-MPC. To install, remove power from the
MSC-MPC and insert the MPC-8AI into the desired option slot
on the MSC-MPC. Wiring instructions, diagrams, and
software assignments are provided below.
Note: When installing the MPC-8AI, be sure that the
controller is fully seated to the backplate before and after the
backplate is fastened to the enclosure.
Sensor Grounding
The shield wire for the room sensor should be grounded to
chassis where the wire enters the enclosure. This ensures
maximum protection from electrical noise and electrostatic
discharge.
Wiring Instructions and Setup Information
Temperature Sensing Inputs
The MPC-8AI allows two types of analog inputs for the
purpose of temperature sensing. They are:
– 1000 ohm platinum RTDs (-40 to +240 °F)
– 1000 ohm Balco RTDs (-30 to +240 °F)
Note: T99 Series temperature sensors cannot be used with
the MPC-8AI module.
Platinum RTD Inputs
The inputs provided for these sensors are terminals AI1 A&B
through AI8 A&B. The inputs are two-wire, twisted pair with
shield.
Inputs are not polarized, terminate one of the wires to terminal
A and the other wire to terminal B. Terminate the shield to
cabinet ground closest to the entry point of the wire into the
enclosure (cut off all additional wire). Cut and tape the shield
at the sensor end to prevent it from coming in contact with
junction box or other conductors. Refer below for wiring and
setup information.
Figure-2 Platinum RTD or Balco Resistance Temperature
Sensor.
Table-1 illustrates the numbering scheme and software
assignments of the platinum RTD inputs. When making these
assignments, the first entry is the option slot number on the
connected MSC-MPC controller and the second entry is the
number of the analog input being using.
For example, when plugged into option slot number 2, analog
input number 1 has an assignment of AI 21.

4© Copyright 2006 TAC All Rights Reserved. F-24853-4
Table-1 Software Assignments for Temperature Input.
INPNT = AI# (as shown below) /NOT
Wiring Length Error
The elements SCALE and OFSET are used to convert the
resistance reading to the proper engineering units. These
elements also provide a method of calibrating the sensor’s
displayed value to any desired value, thus correcting the
system for any errors that may result from wire length or other
variables.
Wiring length error can be eliminated by modifying the
element OFSET. Because the resistance of the wire will be
measured along with that of the sensor element, an error may
result.
AWG 24 wire has a resistance of 17 ohms per thousand feet.
If 50 feet of cable are used in a run, the resistance will be: 50’
x 2 (wires) x 17 ohms/1000’ = 1.7 ohms.
The sensor has a sensitivity of approximately 2.2 ohms per
degree. This 1.7-ohm error will result in a reading that is
approximately .77 higher than the sensor would read if the
wiring error were not present. To eliminate this error using the
element OFSET, simply subtract .77 from the value given in
the table for OFSET.
0-11 Vdc Analog Inputs
When configured as a voltage sensor input, the universal
analog input measures between 0 and 11 Vdc. The input
terminals provided for this range of voltage are terminals AI1-
AI8. Terminate the positive wire to terminal A and the negative
wire to terminal B. Terminal B is tied directly to ground on the
circuit board, so all voltages must be referenced to ground.
Differential and negative voltages must not be measured.
See Figure-5 below for wiring and setup information.
Figure-3 0-11 Volt Analog Input Wiring Information.
Option Slot # On The MSC-MPC Controller
AI# 1 2 3 4
AI1 AI 11 AI 21 AI 31 AI 41
AI2 AI 12 AI 22 AI 32 AI 42
AI3 AI 13 AI 23 AI 33 AI 43
AI4 AI 14 AI 24 AI 34 AI 44
AI5 AI 15 AI 25 AI 35 AI 45
AI6 AI 16 AI 26 AI 36 AI 46
AI7 AI 17 AI 27 AI 37 AI 47
AI8 AI 18 AI 28 AI 38 AI 48
SCALE OFSET CVTYP
1000 ohm Platinum RTD
Alpha = 0.00375
(American Alpha)
°F 346.4 -68.2 LIN L
°C 192.44 -55.67 LIN L
SCALE OFSET CVTYP
1000 ohm Platinum RTD
Alpha = 0.00385
(European Alpha)
TS-5800 Series
°F 337.4 -65.62 LIN L
°C 187.44 -54.23 LIN L
SCALE OFSET CVTYP
1000 ohm
Balco
TS-8000 Series
°F 312.81 -35.65 LIN 2
°C 173.78 -37.58 LIN 2

F-24853-4 © Copyright 2006 TAC All Rights Reserved. 5
Table-2 illustrates the numbering scheme and software
assignments of the eight 0-11 Vdc analog inputs. When
making these assignments, the first entry is the option slot
number on the connection MSC-MPC controller and the
second entry is the number of the analog input being used.
For example, when plugged into option slot number 2, analog
input number 1 has an assignment of AI 21.
Table-2 Software Assignments for 0-11 Vdc Analog
Input.
INPNT = AI# (as shown below) /NOT
Calculating SCALE and OFSET Using MOCALC
MOCALC comes standard with the DOS Configuration Tool
and is used to determine the proper values for SCALE and
OFSET when provided with the desired values to be displayed
from given input parameters. MOCALC is typically used to
calibrate the display in engineering units in accordance with
measurements taken. In some cases it can be used to correct
for tolerance errors in input or output readings.
To use MOCALC, several parameters must be measured
prior to running the program. First, the physical property to be
measured or controlled is sampled near the high end of its
scale and the corresponding bit value is recorded.Then
another reading is taken with the property at the low end of its
scale and the bit value displayed by the system is again
recorded. Once this information is determined, the MOCALC
program is able to calculate the appropriate values for SCALE
and OFSET. Note that the characteristics of the variable must
be linear to use MOCALC.
The sample calculations below are for a Belimo SM24
Actuator with the P500 feedback option that will be used to
control a valve from 0 to 100 percent open.
For the point to be calibrated, set OFSET = 0 and SCALE =
4096.
With the feedback wired, drive the actuator/valve fully open
(100%). Record the measured bit value displayed by the
system for this point. This is the “bit high value”. Next, drive
the actuator/valve fully closed (0%). Record the measured bit
value again. This is the “bit low value”.
You are now ready to execute the MOCALC program.
1. From the C:\XCM directory, type MOCALC and press
ENTER.
2. At the enter number prompt, type 1 to select Formulas for
Scale and OFSET.
3. At the Enter Number prompt, type 6 to select Formulas for
Bit High...Bit Low.
The program prompts you for the device range high and range
low values. These values are the range of the points display,
which in this case is from 0 to 100 percent (open). You will
also need to enter the recorded bit values when the actuator
was driven to these two positions. MOCALC will then compute
the proper SCALE and OFSET for the point to display linearly
across the actuator’s travel range.
Please Enter Device Range High Value
Number: 100
Please Enter Device Range Low Value
Number: 0
Please Enter Recorded BIT HIGH Value
Number: 3298
Please Enter Recorded BIT LOW Value
Number: 517
SCALE: 147.28
OFSET: -18.59
In the example above, the desired display range for the
actuator is 0 to 100 (percent open). The corresponding low
and high bit values were recorded as 517 and 3298,
respectively.
MOCALC determined SCALE to be 147.28 and OFSET to be
-18.59.
The formulas used by MOCALC are as follows:
SCALE = 4096 * (RANHI - RANLO)
(BITHI - BITLO)
OFSET = RANLO (SCALE * BITLO)
4096
Option Slot # On The MSC-MPC Controller
AI# 1 2 3 4
AI1 AI 11 AI 21 AI 31 AI 41
AI2 AI 12 AI 22 AI 32 AI 42
AI3 AI 13 AI 23 AI 33 AI 43
AI4 AI 14 AI 24 AI 34 AI 44
AI5 AI 15 AI 25 AI 35 AI 45
AI6 AI 16 AI 26 AI 36 AI 46
AI7 AI 17 AI 27 AI 37 AI 47
AI8 AI 18 AI 28 AI 38 AI 48
SCALE OFSET CVTYP
11 0 LIN 1

6© Copyright 2006 TAC All Rights Reserved. F-24853-4
4-20 mA Inputs
Any of the universal analog inputs may also be configured as
a 4-20 mA current signal input, as shown in Figure-6.
When configured as a 4-20 mA input, an externally powered
device must be used. The MPC-8AI does not provide panel
power.
Figure-4 4-20 mA Wiring Information.
Table-3 illustrates the numbering scheme and software
assignments of the eight 4-20 mA analog inputs. When
making these assignments, the first entry is the option slot
number on the connected MSC-MPC controller and the
second entry is the number of the analog input being used.
For example, when plugged into option slot number 2, analog
input number 1 has an assignment of AI 21.
Table-3 Software Assignments for 4-20 mA Analog Input.
INPNT = AI# (as shown below) /NOT
Note: To calculate SCALE and OFSET for these devices,
use the MOCALC instructions covered previously in this
document.
Contact Inputs
Any of the universal inputs on the MPC-8AI is capable of
monitoring a single normally open or normally closed contact
input (excluding pulse inputs). This input utilizes a 1K ohm,
1%, 1/4-watt supervision resistor installed with the input
device. The device is terminated to the appropriate AI
connector terminals.
When Configured as a Normally Open Contact Input
Figure-5 Normally Open Contact Input Wiring Information.
Conditions are as follows:
STOP when contact is open
RUN when contact is closed
TROUBLE when conductor is open
The software assignment required for the corresponding
hardware address of the selected contact input is shown in
Table-4 below.
Table-4 Assignments for AIs used as Normally Open
Input.
INPNT = AI# (as shown below) /REV/RUN
Option Slot # On The MSC-MPC Controller
AI# 1 2 3 4
AI1 AI 11 AI 21 AI 31 AI 41
AI2 AI 12 AI 22 AI 32 AI 42
AI3 AI 13 AI 23 AI 33 AI 43
AI4 AI 14 AI 24 AI 34 AI 44
AI5 AI 15 AI 25 AI 35 AI 45
AI6 AI 16 AI 26 AI 36 AI 46
AI7 AI 17 AI 27 AI 37 AI 47
AI8 AI 18 AI 28 AI 38 AI 48
SCALE OFSET CVTYP
20 0 LIN H
Option Slot # On The MSC-MPC Controller
AI# 1 2 3 4
AI1 AI 11 AI 21 AI 31 AI 41
AI2 AI 12 AI 22 AI 32 AI 42
AI3 AI 13 AI 23 AI 33 AI 43
AI4 AI 14 AI 24 AI 34 AI 44
AI5 AI 15 AI 25 AI 35 AI 45
AI6 AI 16 AI 26 AI 36 AI 46
AI7 AI 17 AI 27 AI 37 AI 47
AI8 AI 18 AI 28 AI 38 AI 48

F-24853-4 © Copyright 2006 TAC All Rights Reserved. 7
When Configured as a Normally Closed Contact Input
Figure-6 Normally Closed Contact Input Wiring Information.
Conditions are as follows:
STOP when contact is closed
RUN when contact is open
TROUBLE when conductor is shorted
The software assignment required for the corresponding
hardware address of the selected contact input is shown in
Table-5 below.
Table-5 Assignments for AIs used as Normally Closed
Contact Inputs.
INPNT = AI# (as shown below) /NOT
Option Slot # On The MSC-MPC Controller
CI# 1 2 3 4
AI1 AI 11 AI 21 AI 31 AI 41
AI2 AI 12 AI 22 AI 32 AI 42
AI3 AI 13 AI 23 AI 33 AI 43
AI4 AI 14 AI 24 AI 34 AI 44
AI5 AI 15 AI 25 AI 35 AI 45
AI6 AI 16 AI 26 AI 36 AI 46
AI7 AI 17 AI 27 AI 37 AI 47
AI8 AI 18 AI 28 AI 38 AI 48

Copyright 2006, TAC
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-24853-4
www.tac.com
TAC
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940