Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 159)

Publication 1756-UM009C-EN-P - December 2010 159
Non-isolated Analog Output Modules (1756-OF4 and 1756-OF8) Chapter 7
1756-OF4 and 1756-OF8
Module Fault and
Status Reporting The 1756-OF4 and 1756-OF8 modules multicast status and fault data to the
owner-listening controller with their channel data. The fault data is arranged in
such a manner as to let you choose the level of granularity for examining fault
conditions.
Three levels of tags work together to provide increasing degree of detail as to
the specific cause of faults on the module.
The table lists tags that can be examined in ladder logic to indicate when a fault
occurs.
Tag Description
Module Fault
Word This word provides fault summary reporting. Its tag name
is ModuleFaults.
Channel Fault
Word This word provides underrange, overrange and communications fault
reporting. Its tag name is ChannelFaults.
Channel Status
Words This word provides individual channel underrange and overrange fault
reporting for process alarms, rate alarms and calibration faults. Its tag
name is ChxStatus.
IMPORTANT
Differences exist between floating point and integer modes as
they relate to module fault reporting. These differences are
explained in the following two sections.