Analog Output Modules - Motorola V186 - Cell Phone - GSM System Planner Manual

Analog Output Modules

The Analog Output (AO) modules have four optically-isolated analog output channels for
controlling user devices (see Figure 1). Each channel has two possible outputs: 0-20 mA
Interface industry standard current output and 0-5 V Interface industry standard voltage
output. Only one of the outputs can be enabled in a particular channel - either current or
voltage.
The module's digital to analog converter resolution is 14 bit. The Analog Output
channels are optically isolated from the module internal logic circuits. The modules are
fully calibrated and can be tested and recalibrated in the field.
Each analog output has three status LEDs, Vout, Iout, and CAL which represent the
calibration status of each output for voltage/current.
The AO Module Configuration includes:
AO Type - The analog outputs can be set to voltage, current, or raw data.
AO Value - The analog outputs can be set to a numeric value (in the range of 0 to
16000) or either in voltage or current according to the output type. The values for
voltage are 0 to 10 V and the values for current are 0 to 20 mA.
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.
"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.
Sleep Mode - Each AO module can be switched by the user application program
to Sleep Mode. In Sleep Mode, the module does not function and the power
consumption is minimized. During Sleep mode the user application program will
get the predefined values for each output.
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).
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