6
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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
