Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 78)

78 Publication 1756-UM0009C-EN-P - December 2010
Chapter 4 Non-isolated Analog Voltage/Current Input Modules (1756-IF16, 1756-IF8)
1756-IF16 Module Fault and
Status Reporting The 1756-IF16 module multicasts status and fault data to the owner/listening
controller with its 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 an 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
has occurred:
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 communication fault
reporting. Its tag name is ChannelFaults. When examining the Channel
Fault Word for faults, remember the following:
• 16 channels are used in single-ended wiring.
• Eight channels are used in differential wiring.
• Four channels are used in high-speed differential wiring.
• All bytes start with bit 0.
Channel Status
Words These words, one per channel, provide 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.