Rockwell Automation Publication 1756-RM011A-EN-P - June 2016 15
Chapter 3
Hardware Specifications and Considerations
Backplane Power
Current Draw
Depending on the module, configuration, and operating conditions, 8-channel
modules can draw more backplane power than their 6-channel counter parts.
Calculate the expected backplane current of an 8-channel module before
replacing a 6-channel module to ensure you are within the limits of your power
supply.
Backplane Current Draw at 5.1V
All 8-channel modules are equal to or less than the 5.1V current draw of their
6-channel counterpart, therefore there are no issues at 5.1V.
Backplane Current Draw at 24V
All 8-channel modules require more current at 24V than their 6-channel
counterpart, therefore you must recalculate the load on your power supply to
be sure you are within limits.
Topic Page
Backplane Power 15
Calibration 16
RPI and RTS Values of 6- Channel vs. 8- Channel Modules 16
Cold Junction Compensation on Thermocouple Modules 17
Using an External Loop Supply with the 1756-IF6CIS 17
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