Siemens Simatic SM331 - Wiring of the Analog Module

Electrical connection
5.3 Wiring of the analog module
SM331; AI 8x12 Bit Getting Started part 1: 4 -20mA
Getting Started, 11/2006, A5E00253410-02
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Wiring principles of a 4-wire current transducer
Unlike a 2-wire transducer, this transducer has its own power supply.
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Figure 5-3 Wiring: 4-Wire current transducer
5.3.3 Wiring of the analog module
Tasks
The wiring of the analog module consists of the following tasks:
● Connecting the power supply (red cable)
● Connecting the 2-wire current transducer (green cables)
● Terminating unused channels with a resistor
● Connecting the 4-wire current transducer (green cables)
● Connecting the 4-wire current transducer (green cables)
● Connecting to ground and short-circuiting the other unused channels (blue wires)