Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 193
Analog I/O Module Tag Definitions Appendix A
Ch[x].Fault BOOL Quality of channel data. • 0 = Good
• 1 = Bad
Ch[x].Uncertain BOOL Channel data can be imperfect. • 0 = Good
• 1 = Uncertain
Ch[x].Underrange BOOL Indicates the channel data is beneath the absolute
minimum for this channel.
For example, when the channel operates in the
-100…100 mV input range, the absolute minimum on
the channel is -101.00 mV. If the input signal is -102.00
mV, this tag is set to 1.
• 0 = Channel is not beneath the
absolute minimum
• 1 = Channel is beneath the
absolute minimum
Ch[x].Overrange BOOL Indicates the channel data is above the absolute
maximum for this channel.
For example, when the channel operates in the
-100…100 mV input range, the absolute maximum on
the channel is 101.00 mV. If the input signal is 102.00 mV,
this tag is set to 1.
• 0 = Channel is not above the
absolute minimum
• 1 = Channel is above the
absolute minimum
Ch[x].LLAlarm BOOL Triggered when the I.Ch[x].Data tag value is less than the
C.Ch[x].LLAlarmLimit. 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].LAlarm BOOL Triggered when the I.Ch[x].Data tag value is less than the
C.Ch[x].LAlarmLimit 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].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 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.
• 0 = Invalid Low Reference signal
has not been sampled on this
channel
• 1 = Invalid Low Reference signal
has been sampled on this
channel
Table 32 - 1756-IRT8I Module - Input Tags (continued)
Tag Name Data Type Definition Valid Values
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