Compensation By Means Of Dynamic Reference Temperature - Siemens SIMATIC ET 200AL System Manual

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Thermocouples

5.3 Compensation for the reference junction temperature

Compensation by means of dynamic reference temperature

Function principle

This compensation type allows you to handle the reference junction temperature for

temperature compensation in the user program. You can derive the temperature value from

any other module of the station. The reference junction temperature is transferred via data

records using the instruction WRREC (SFB 53).

The structure of the data records is detailed in the device manual for each module.

STEP 7 project with the following contents:

● User program with WRREC (SFB 53) instruction for transferring the data records with

reference temperature

● Analog module for acquisition of the process temperature using thermocouple (TC)

● Analog module for measuring the process temperature using thermal resistor (RTD)

Analog value processing

Function Manual, 06/2014, A5E03461439-AC

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