Siemens Simatic S7-300

Priniples of analog value processing
4.4 Connecting current transducers
S7-300 Automation System Module data
4-8 Manual, 08/2006, A5E00105505-04
4.4 4.4 Connecting current transducers
Introduction
This chapter contains a description of wiring current transducers and points to which
particular attention must be paid.
Current transducers which can be wired up
● As 2-wire transducer
● As 4-wire transducer
Wire 2-wire transducer with supply via module
The 2-wire transducer is wired to a short circuit-proof supply voltage at the terminals of the
analog input module.
This transducer converts the measured variable into a current. 2-wire transducers must be
electrically isolated.
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Figure 4-6 Wire 2-wire transducers to electrically isolated AI