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The AO module value representation is as follows:
In 0-20 mA current
outputs
In 0- 10 V voltage
outputs
AO Calibration
The upper and lower limits of analog outputs can be calibrated - either as current (20mA upper
limit and 4mA lower limit) or voltage (10V upper limit and 2V lower limit). Default upper
and lower calibration limits are provided from the factory. See Module Status and Diagnostics
for details.
Keep Last Value (KLV) and Predefined Value (PDV)
Each output can be configured to KLV or to a PDV. This value is maintained in the event of
AO module failure or communication failure with the CPU.
The predefined value can also be used during normal operation to force a value that masks the
actual output value.
I/O Legacy Resolution Parameter
In systems with both ACE3600 RTUs and legacy (MOSCAD/MOSCAD-L) RTUs, some
MOSCAD/MOSCAD-L applications can be upgraded to ACE3600 without modifying the
references to analog values in the applications ('C' or ladder). The I/O Legacy Resolution
STS advanced parameter sets the Analog I/O bit resolution to either Actual (ACE3600) or
Legacy (MOSCAD/MOSCAD-L).
For values and restrictions, see Appendix A: Site Configuration Parameters in the ACE3600
STS User Guide.
Decimal Value
0
4000
8000
16000
Decimal Value
0
4000
8000
16000
13-4
Analog Output Module
Output
Current
0
5 mA
10 mA
20 mA
Output
Voltage
0 V
2.5 V
5 V
10 V
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