Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 164)

164 Publication 1756-UM009C-EN-P - December 2010
Chapter 7 Non-isolated Analog Output Modules (1756-OF4 and 1756-OF8)
Module Fault Word Bits – Integer Mode
In integer mode, Module Fault word bits (bits 15…11) operate exactly as
described in floating point mode. The table lists tags that are found in the
Module Fault Word.
Channel Fault Word Bits – Integer Mode
In integer mode, Channel Fault word bits (bits 7…0) operate exactly as
described in floating point mode for calibration and communications faults.
During normal operation, these bits are only set for an open wire condition.
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:
• enable output clamping.
• are checking for a open wire condition (0 …20 mA configuration only).
Tag Description
Analog Group
Fault This bit is set when any bits in the Channel Fault word are set. Its tag
name is AnalogGroupFault.
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 ‘000F’ for all bits on the 1756-OF4 module
‘00FF’ for all bits on the 1756-OF8 module
A communications fault occurred
between the module and its
owner-controller ‘FFFF’ for all bits on either module