Siemens SIMATIC S7-300 Reference Manual page 257

Programmable logic controllers module data

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Connecting Current Sensors

The necessary connecting cables, which result from the potential connection of the

analog input module and the sensors, are not drawn in the figures shown below.

In other words, you must continue to take note of and implement Section 4.8 with

its generally valid information for connecting sensors.

Abbreviations and mnemonics used in the figures below

The abbreviations and mnemonics used in the figures below have the following

Supply voltage of the sensors

The 2-wire transmitter receives its short-circuit-proof power supply via the

terminals of the analog input module.

This transmitter then converts the measured variable into a current. Two-wire

transmitters must be isolated sensors.

Four-wire transmitters have separate power supplies.

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Measuring lead (positive)

Measuring lead (negative)

Reference potential of the analog measuring circuit

Ground terminal

Terminal for 24 VDC supply voltage

Measuring lead for current input

Analog Modules

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