Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 333)

Publication 1756-UM009C-EN-P - December 2010 333
Analog I/O Tag Definitions Appendix B
Floating Point Output Tags
Floating Point Output Tags
Tag Name Data Type Applicable
Modules Definition:
Ch0Data REAL All outputs The value the channel is set to output in engineering units based upon the
configured scaling for the channel.
Ch0DataEcho REAL All outputs The value the channel is currently outputting in engineering units based upon
the configured user scaling. Will match the requested output value, O tag
Ch0Data, unless: in Program mode, calibrating, beneath Low Limit, above High
Limit, currently ramping or In Hold.
OutGroupFault BOOL All outputs Indicates if a channel fault has occurred on any output channel.
Ch0NotANumber BOOL All outputs Bit indicating the received output value from the controller, O tag Ch0Data,
was an invalid IEEE floating point value. When an invalid value is received, the
output value holds its last known valid state.
Ch0InHold BOOL All outputs Bit that indicates if the output channel is currently holding until the Output
value sent to the module (O tag Ch0Data) matches the current output value
(I tag Ch0Data) within 0.1% of the channel’s full scale.
CH0RampAlarm BOOL All outputs Alarm bit that sets when the requested output value, Ch0ConfigRampToRun
set, and the difference between the new output value requested and the
current output exceeds the configured ramp limit, Ch0ConfigMaxRampRate.
The bit will remain set until ramping ceases unless the alarm is latched via
Ch0ConfigRampAlarmLatch.
Ch0LLimitAlarm BOOL All outputs Alarm bit that sets when the requested output value, Ch0Data, is below the
configured low limit, Ch0ConfigLowLimit, in which case the output will stop at
the configured low limit which the echo will reflect. Remains set until the
requested output moves above the low limit unless latched by
Ch0ConfigLimitAlarmLatch.
Ch0HLimitAlarm BOOL All outputs Alarm bit that sets when the requested output value, Ch0Data, is above the
configured high limit, Ch0ConfigHighLimit, in which case the output will stop
at the configured high limit which the echo will reflect. Remains set until the
requested output moves below the high limit unless latched by
Ch0ConfigLimitAlarmLatch.