Rockwell Automation Publication 2080-UM004C-EN-E - March 2015 23
Non-isolated Thermocouple and RTD Plug-in Modules – 2080-TC2 and 2080-RTD2 Appendix 3
Temperature Conversion – Data to Degree Celsius (°C)
To keep the precision of temperature value from the Thermocouple and RTD
plug-in modules, there is a general data mapping conversion in the firmware
before the actual temperature is sent to the Connected Components Workbench
software.
The following equation shows how the Connected Components Workbench
software data count is mapped from temperature Celsius degree by the firmware:
Connected Components Workbench software Data Count = (Temp (°C) +
270.0)*10;
This equation illustrates how the Connected Components Workbench data
count does not use full range of 0…65535 of data word.
Derive Actual Temperature °C From Connected Components Workbench
Data Count:
The following formula shows how to derive temperature Celsius degree from
temperature data word in the Connected Components Workbench software:
Temp (°C) = (Data - 2700)/10;
Examples:
1234 → (1234 - 2700)/10 → -146.6 °C
8000 → (8000 - 2700)/10 → 530.0°C
This conversion formula applies to all types of Thermocouple and
RTD sensors.
Underrange, overrange error reporting checking is not based on
Connected Components Workbench temperature data count, but the
actual temperature (°C) or the voltage going into the plug-in
module.
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