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Analog Modules

4-64

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Connecting thermocouples with temperature compensation to the

SM 331; AI 8 x TC

All 8 inputs are available as measurement channels when the thermocouples are

connected via reference junctions that are controlled at 0 °C or 50 °C.

Backplane

bus

ADUs

L+

M+

M-

M+

M-

M+

M-

Copper

wire

Reference junction

controlled at

0C or 50C

Logic

Figure 4-26 Connecting thermocouples via a reference junction to the

SM 331; AI 8 x TC

Siemens 6ES7 305-1BA80-0AA0 Reference Manual

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