Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 181)

Publication 1756-UM009C-EN-P - December 2010 181
Isolated Analog Output Modules (1756-OF6CI and 1756-OF6VI) Chapter 8
Module Fault Word Bits – Floating Point Mode
Bits in this word provide the highest level of fault detection. A nonzero
condition in this word reveals that a fault exists on the module. You can
examine further down to isolate the fault.
The table lists tags that are found in the Module Fault Word:
Channel Fault Word Bits – Floating Point Mode
During normal module operation, Channel Fault word bits are set if any of the
respective channels has a High or Low Limit Alarm. Checking this word for a
nonzero condition is a quick way to check for High or Low Limit Alarm
condition on a channel.
The table lists the conditions that set all Channel Fault word bits:
Your logic should monitor the Channel Fault bit for a particular output, if you
either:
• set the high and low limit alarms outside your operating range.
• disable output limiting.
Tag Description
Analog Group
Fault This bit is set when any bits in the Channel Fault word are set. Its tag
name is AnalogGroupFault.
Output Group
Fault This bit is set when any bits in the Channel Fault word are set. Its tag
name is OutputGroupFault.
Calibrating This bit is set when any channel is being calibrated. When this bit is
set, all bits in the Channel Fault word are set. Its tag name
is Calibrating.
Calibration Fault This bit is set when any of the individual Channel Calibration Fault bits
are set. Its tag name is CalibrationFault.
This condition sets all Channel
Fault word bits And causes the module to display the
following in the Channel Fault word bits
A channel is being calibrated ’003F’ for all bits
A communications fault occurred
between the module and its
owner-controller ’FFFF’ for all bits