186 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Appendix A Analog I/O Module Tag Definitions
Ch[x].HAlarm BOOL Triggered when the I.Ch[x].Data tag value is greater than
the C.Ch[x].HAlarmLimit tag value.
If latched, this tag remains set until unlatched or if the
I.Ch[x].Data tag value is within Deadband.
• 0 = Alarm is not triggered
• 1 = Alarm is set
Ch[x].HHAlarm BOOL Triggered when the I.Ch[x].Data tag value is greater than
the C.Ch[x].HHAlarmLimit tag value.
If latched, this tag remains set until unlatched or if the
I.Ch[x].Data tag value is within Deadband.
• 0 = Alarm is not triggered
• 1 = Alarm is triggered
Ch[x].RateAlarm BOOL Triggered when the absolute change between
consecutive channel samples exceeds the
C.Ch[x].RateAlarmLimit tag value.
If latched, this tag remains set until it is unlatched.
• 0 = Alarm is not triggered
• 1 = Alarm is triggered
Ch[x].CalibrationFault BOOL Indicates that the channel is not calibrated or the last
attempted calibration for this channel failed.
If the last calibration failed, this tag is cleared, that is, set
to 0, when power is cycled to the module.
• 0 = Calibration did not fail
• 1 = Calibration failure
Ch[x].Calibrating BOOL Indicates the channel is currently being calibrated. • 0 = Channel is not being
calibrated
• 1 = Channel is being calibrated
Ch[x].CalGoodLowRef BOOL Indicates that a valid Low Reference signal has been
sampled on this channel.
• 0 = Valid Low Reference signal
has not been sampled on this
channel
• 1 = Valid Low Reference signal
has been sampled on this
channel
Ch[x].CalBadLowRef BOOL Indicates that an invalid Low Reference signal has been
sampled on this channel.
You must correct this condition to successfully calibrate
the module.
If calibration is aborted with an invalid Low Reference
signal, the I.Ch[x].CalibrationFault tag is set for this
channel until a successful calibration is performed or a
reset or RIUP occurs.
• 0 = Invalid Low Reference signal
has not been sampled on this
channel
• 1 = Invalid Low Reference signal
has been sampled on this
channel
Ch[x].CalGoodHighRef BOOL Indicates that a valid High Reference signal has been
sampled on this channel.
• 0 = Valid High Reference signal
has not been sampled on this
channel
• 1 = Valid High Reference signal
has been sampled on this
channel
Ch[x].CalBadHighRef BOOL Indicates that an invalid High Reference signal has been
sampled on this channel.
You must correct this condition to successfully calibrate
the module.
If calibration is aborted with an invalid High Reference
signal, the I.Ch[x].CalibrationFault tag is set for this
channel until a successful calibration is performed.
• 0 = Invalid High Reference
signal has not been sampled on
this channel
• 1 = In
valid High Reference
signal has been sampled on this
channel
Ch[x].CalSuccessful BOOL Indicates calibration on this channel is complete and the
Calibrating state has been exited.
This tag remains set after valid calibration for 1000
samples.
• 0 = Calibration was not
successful
• 1 = Calibration was successful
and calibrating state has been
exited.
Ch[x].RateOfChange REAL Change in channel data since last sample in
Engineering Units/Second.
Value representing the rate
of change
0.0 = default (This value indicates
no change occurred since sample.)
Table 29 - 1756-IF8I Module - Input Tags (continued)
Tag Name Data Type Definition Valid Values
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