58 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Chapter 3 1756-IF8I Isolated Analog Input Module
Fault and Status Reporting
The 1756-IF8I module multicasts fault and status data with channel data to the
owner and listening controllers. The data is returned via module tags that you can
monitor in your Logix Designer application.
With some exceptions, as noted in the following table, the 1756-IF8I module
provides the fault and data status in a channel-centric format.
The following table lists the fault and status tags for the 1756-IF8I module
available in the Logix Designer application.
Data Type Tag Name Triggering Event That Sets Tag
Fault
Fault
(1)
The owner-controller loses its connection to the module.
Ch[x].Fault The channel data quality is bad.
Ch[x].Underrange The channel data is beneath the absolute minimum for this channel.
Ch[x].Overrange The channel data is above the absolute maximum for this channel.
Status
CIPSyncValid
(1)
Indicates whether the module is synchronized to a valid CIP Sync time master on the backplane.
CIPSyncTimeout
(1)
Indicates whether a valid time master on the backplane has timed out.
CIPSyncOffsetJump
(1)
Indicates a significant jump, that is, 1 ms or greater, in the CST and CIP Sync times sent from the Time Master to the
module. (The Time Master sends the CST and CIP Sync times to the module every second.)
When a significant jump occurs, this tag value becomes 1 but changes to 0 a second later unless another jump
occurred.
Ch[x].Uncertain The channel data can be imperfect.
Ch[x].LLAlarm The I.Ch[x].Data tag value is less than the C.Ch[x].LLAlarmLimit tag value, the O.Ch[x].LLAlarmEn tag is set and alarms
are enabled for the channel.
Ch[x].LAlarm The I.Ch[x].Data tag value is less than the C.Ch[x].LAlarmLimit tag value, the O.Ch[x].LAlarmEn tag is set and alarms
are enabled for the channel.
Ch[x].HAlarm The I.Ch[x].Data tag value is greater than the C.Ch[x].HAlarmLimit tag value, the O.Ch[x].HAlarmEn tag is set and
alarms are enabled for the channel.
Ch[x].HHAlarm The I.Ch[x].Data tag value is greater than the C.Ch[x].HHAlarmLimit tag value, the O.Ch[x].HHAlarmEn tag is set and
alarms are enabled for the channel.
Ch[x].RateAlarm The absolute change between consecutive channel samples exceeds the C.Ch[x].RateAlarmLimit tag value.
This alarm only applies to enabled Process alarms.
Ch[x].CalibrationFault Channel is not calibrated or the last attempted Calibration for this channel failed.
Ch[x].Calibrating The channel is currently being calibrated.
Ch[x].CalGoodLowRef A valid Low Reference signal has been sampled on this channel.
Ch[x].CalBadLowRef An invalid Low Reference signal has been sampled on this channel.
Ch[x].CalGoodHighRef An valid High Reference signal has been sampled on this channel.
Ch[x].CalBadHighRef An invalid High Reference signal has been sampled on this channel.
Ch[x].CalSuccessful Calibration on this channel is complete and the Calibrating state has been exited.
Ch[x].RateOfChange The change in channel data since last sample in Engineering Units/Second.
Ch[x].Data The channel data in scaled Engineering Units.
Timestamp
(1)
A 64-bit Timestamp that indicates when all eight channels were last sampled in terms of CIP Sync time.
RollingTimestamp
(1)
16-bit timestamp that ‘rolls’ from 0…32,767 ms. Compatible with existing PID instruction to automatically calculate
sample deltas.
(1) This tag provides module-wide data and affects all channels simultaneously.
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