Rockwell Automation Publication 1756-UM540E-EN-P - December 2017 189
Analog I/O Module Tag Definitions Appendix A
1756-IRT8I Module Tags
This section describes the tags associated with the 1756-IRT8I module.
Configuration Tags
The following table describes the Configuration tags associated with the
1756-IRT8I module.
Ch[x].CalLowReference BOOL Rising edge triggers the Low Calibration at the Low
Reference Point for the current C.Ch[x].InputRange tag
value.
A valid Low Reference signal must be connected to the
channel before setting this tag.
• 0 = Do not sample the Low
Reference Calibration Point.
• 1 = Sample the Low Reference
Calibration point on rising edge.
Ch[x].CalHighReference BOOL Rising edge triggers a High Calibration at the High
Reference Point for the current C.Ch[x]nputRange tag
value.
A valid High Reference signal must be connected to the
channel before setting tag.
• 0 = Do not sample the High
Reference Calibration Point.
• 1 = Sample the High Reference
Calibration point on rising edge.
Ch[x].SensorOffset REAL Compensates for any known error on the sensor or
channel to which the sensor is connected.
Any
(We recommend that you use a
small value in the channel’s
operating range.)
0.0 = default
Table 30 - 1756-IF8I Module - Output Tags (continued)
Tag Name Data Type Definition Valid Values
Each application’s series of tags varies but no input module application
contains any tags that are not listed here.
Table 31 - 1756-IRT8I Module - Configuration Tags
Tag Name Data Type Definition Valid Values
RemoteTermination BOOL Indicates CJC Sensor is connected remotely or locally.
• If the CJC sensor if connected remotely, we
recommend that you use an isothermal bar.
With an isothermal bar, the CJC sensor is the same for
all eight channels.
1492 IFMs use a built-in isothermal bar.
• If the CJC sensor is connected locally, thermal
gradients exist on the RTB because heat rises.
With an RTB, temperature differences exist between
the CJC sensors. Correction factors are applied
internally to account for the differences.
• 0 = CJC sensor is
connected locally via the RTB
• 1 = CJC sensor is connected
remotely (default)
CJDisable BOOL Removes cold junction compensation from Thermocouple
calculations.
By default module configuration, cold junction is
compensated for each Thermocouple channel returning
temperature.
• 0 = CJ compensation enabled
• 1 = No CJ compensation
CJOffset REAL User-defined offset value, measure in temperature units,
to add to the channel’s CJC sensor reading.
Default = 0.0 C
Ch[x].InputRange SINT Channel’s operating range. • 4 = -100…100 mV
• 6 = 0…500 Ω
• 7 = 0…1000 Ω
• 8 = 0…2000 Ω
• 9 = 0…4000 Ω
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