GE VersaMax - Page 305

10-8 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003 GFK-1504K
10
IC200ALG230
Analog Input Module, 12 Bit Voltage/Current 4 Channels
Count and Input Voltage
Volta
g
e
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
0 8192 16384 24576 32767
Unipolar
-32768 -16384 0 +16383 +32767
Bipolar
Count
Unipolar
Bipolar
2.5mV
5.0mV
24
16
8
0
0V
7.5mV
2.5mV = 8 counts
5.1225V
5.125V
16408
16400
16392
16384
5.12V
5.1275V
2.5mV = 8 counts
The following equations can be used to calculate counts values:
Bipolar voltage:
Counts = ( +Voltage In) x (3200)
Unipolar voltage:
Counts = ( +Voltage In) x (3200)
For a change in the reported count value to be seen, input current must be increased by at
least 2.5mV. If the module receives an increase less than 2.5mV, the previous count value
is still reported. For example:
Voltage Count
5.1200V 16384
5.1220V 16384
5.1225V 16392
Input Defaults
The module’s analog input (%AI) data can be configured to either hold last state or to go
to a configured value if an error causes the inputs to default.
If the module is autoconfigured, the input default is 0.
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