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Siemens Simatic S7-400 User Manual

Page 274

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Analog Modules

5-58

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Connecting Thermocouples and Resistance Thermometers

Connect the resistance thermometer to channel 0 of the module. Make sure that
you parameterize the “RTD on Channel 0“ reference junction in STEP 7 for each
channel that has a thermocouple connected to it.

If all thermocouples connected to the inputs of the module have the same
comparison point, you compensate as follows:

M

+

M

M

+

M

Reference
junction

Incoming line (Cu)

Equalizing line (same
material as
thermocouple)

M

I

I

C+

C–

M

+

RTD on Channel 0

Figure 5-20

Connection of Thermocouples of the Same Type with External Compensation
by Means of a Resistance Thermometer, Connected to Channel 0

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