Siemens SIMATIC S7-300 Reference Manual page 315

Programmable logic controllers module data

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Terminal Connection Diagram and Block Diagram of the

The following figure shows some examples of connections for the different types of

measurements on channels 4 to 7. Basically, these connection examples apply to

all channels (channel 0 to 7).

Figure 4-39 Module View and Block Diagram of the Analog Input Module SM 331; AI 8

When connecting the voltage and current sensors, make sure that you do not

exceed the maximum permitted common-mode voltage U

inputs. So to prevent measuring errors, interconnect the individual M– terminals.

It is not necessary to interconnect the M– terminals when measuring resistors and

resistance temperature detectors.

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

backplane bus

SM 331; AI 8 x 13 bits

Internal supply

Analog Modules

Connection example

of 2 V between the

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