Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 149)

 
Document: 553633
ICSTT-RM405f-EN-P
Issue 07
5-51
Configuring Analogue Outputs
You can wire analogue output channels to the following variable type and data
structures:
 REAL (the <variable_name> gives the commanded state)
 T9K_AO_Compact (provides three elements)
 T9K_AO_Full (seven elements)
The structures provide additional information about the output, such as line fault
status and discrepancy status.
Note: The controller writes its analogue outputs once per application cycle; the
analogue output variables are also updated once per application cycle.
The State Variable for Analogue Outputs
The state variable for an analogue output is an unsigned integer with a value from 1 to
7 representing the following:
1 = no-vfield: the field supply voltage is at or below 18V dc and the commanded
current is less than 0.4mA for that channel.
Note: When the state variable is 1, the field voltage (<tagname.V>) is reported as
0mV.
2 = off: the reported raw count value is less than 102 (0.4mA).
3 = no-load: the controller cannot detect a load connected to the channel field wiring,
or the loop voltage cannot be detected. This occurs when the commanded current is
greater than 0.4mA, the raw count value is less than 51 (0.2mA) and the measured
voltage is less than 1000mV.
4 = on: the raw count value is 102 or greater (>=0.4mA).
5 = compliance fault: there is not enough loop voltage available to sustain the
commanded output current to within the safety accuracy specification (i.e. 1% full scale
or 0.2mA) and the commanded current is greater than 102 Counts (0.4 mA). Note
that the output will provide as much current as is available and will not initiate a fail-
safe action or report a channel fault.
6 = reverse-polarity: the measured voltage is less than -1000 mV.
7 = faulted.