Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 113)

Publication 1756-UM009C-EN-P - December 2010 113
Sourcing Current Loop Input Module (1756-IF6CIS) and Isolated Analog Voltage/Current Input Module (1756-IF6I) Chapter 5
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 can be examined in ladder logic to indicate when a fault
has occurred:
Channel Fault Word Bits – Floating Point Mode
During normal module operation, bits in the Channel Fault word are set if any
of the respective channels has an Under or Overrange condition. Checking this
word for a non-zero value is a quick way to check for Under or Overrange
conditions on the module.
The table lists the conditions that set all Channel Fault word bits.
Your logic can monitor the Channel Fault Word bit for a particular input to
determine the state of that point.
Tag Description
Analog Group
Fault This bit is set when any bits in the Channel Fault word are set. Its tag
name is AnalogGroupFault.
Input Group Fault This bit is set when any bits in the Channel Fault word are set. Its tag
name is InputGroup.
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.
Conditions for Channel Fault
Word Bits Displays
A channel is being calibrated. ’003F’ for all bits.
A communication fault occurred
between the module and its
owner-controller. ’FFFF’ for all bits.