Rockwell Automation 1756-OF8H ControlLogix HART Analog I/O Modules - Manual (Page 65)

Rockwell Automation Publication 1756-UM533C-EN-P - February 2011 65
1756-IF8H HART Analog Input Module Chapter 4
1756-IF8H Module Fault Word Bits
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 to
isolate the fault.
Table 7 lists tags that can be examined in ladder logic to indicate
when a fault has occurred.
1756-IF8H Channel Fault Tags
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 nonzero value is a quick way to check for Under or Overrange
conditions on the module.
Table 8 lists the conditions that set all Channel Fault word bits.
Table 7 - Tags That Can Be Examined in Ladder Logic
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 CalFault.
Table 8 - Conditions That Set All Channel Fault Word Bits
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 16#00FF
A communication fault occurred between the module and its owner-controller 16#FFFF