Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 182)

182 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Appendix A Isolated Analog I/O Module Tag Definitions
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.
IMPORTANT Each application’s series of tags varies but no input module application
contains any tags that are not listed here.
Table 23 - 1756-IRT8I Module - Configuration Tags
Tag Name Size 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 8 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 = 1…500 Ω
• 7 = 2…1000 Ω
• 8 = 4…2000 Ω
• 9 = 8…4000 Ω