Siemens SIMATIC User Manual

Principles of analog value processing
4.6 Wiring and connecting thermocouples
S7-300 Module data
256 Manual, 06/2017, A5E00105505-AJ
Connection of the reference junction
If all thermocouples connected to the module's inputs share a common reference junction,
compensate the circuit as follows:
Figure 4-16 Connection of thermocouples to reference junction
Additional information
You can find additional information on the compensating box and connection to an analog
module on the Internet. (
https://support.industry.siemens.com/cs/ww/en/view/18272332
)

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)