Spectrum Controls 1756sc-IF8u - Manual (Page 62)

50 ControlLogix ™ Universal Analog Input Module
Input Tags The following fault and status reporting and module data sections allow
monitoring of faults, status, and input data from the module. These tags
can be found withing the IF8U_Input controller tag.
Fault and Status
Reporting Tags The 1756-IF8u module multicasts status/fault data to the owner/listening
controller with its channel data. The fault data is arranged in such a
manner as to allow the user to choose the level of granularity he desires
for determining 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 following tags
can be examined in ladder logic to indicate when a fault has occurred:
Channel Fault Word
- This word provides underrange, overrange, and
communications fault reporting. It’s tag name is .ChannelFaults.
Module Fault Word
- This word provides fault summary reporting. Its
tag name is .ModuleFaults.
Channel Status Words
- These words provide individual channel
underrange and overrange fault reporting for process alarms, rate alarms
and calibration faults. Its tag name is .ChannelStatus.
.ChannelFaults
Bits 0-7, corresponding to channels 0-7 respectively, will be set if the
channle is over range or under range.
Any bits set in ChannelFaults sets the ModuleFaults word, InGroupFault
and AnalogGroupFault bits.
All bits of the .ChannelFaults tag will be set (16#FFFF) when a
communication fault has occured and its owner controller
.Ch0Fault
.Ch1Fault
.Ch2Fault
.Ch3Fault
.Ch4Fault
.Ch5Fault
.Ch6Fault
.Ch7Fault
Ch(x)Fault
- Individual channel fault status bit. This indicates an
overrange or underrange condition on the channel. These bits are also set
by the controller if communications are lost with the I/O module.