GE VersaMax Manual page 305

10
IC200ALG230
Analog Input Module, 12 Bit Voltage/Current 4 Channels
Count and Input Voltage
Voltage
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
0
-32768
The following equations can be used to calculate counts values:
Bipolar voltage:
Unipolar voltage:
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:
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.
10-8 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
2.5mV = 8 counts
5.1275V
5.125V
16408
5.1225V
16400
5.12V
16392
16384
Unipolar
Bipolar
8192 16384 24576
-16384 0 +16383
Count
Counts = ( +Voltage In) x (3200)
Counts = ( +Voltage In) x (3200)
Voltage
5.1200V
5.1220V
5.1225V
2.5mV = 8 counts
2.5mV
0V
0
Unipolar
32767
Bipolar
+32767
Count
16384
16384
16392
7.5mV
5.0mV
24
16
8
GFK-1504K