Siemens SIMATIC ET 200AL, System Manual

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Analog value processing
Function Manual, 06/2014, A5E03461439-AC
65
Connecting transducers
4
4.1 Overview
Introduction
This chapter describes the basic procedure for wiring transducers to analog inputs.
Information on specific wiring options is available in the manual of each module.
For more information, e.g. on cable routing and shielding or potential equalization,
etc., refer to the function manual for Configuring interference-free controllers
( http://support.automation.siemens.com/WW/view/en/59193566 ).
Transducers that can be wired to analog inputs
You can wire the following transducers to the analog input modules, depending on the type
of measurement:
● Voltage transducers
● Current transducers
– 2-wire transducers
– 4-wire transducers
● Resistance transducers
– 4-wire connection
– 3-wire connection
– 2-wire connection
● Thermocouples
Isolated transducers and non-isolated transducers
Transducers are available in various models:
● Isolated transducers are not connected locally to the ground potential. Floating operation
is possible.
● Non-isolated transducers are connected locally to the ground potential.
Non-isolated transducer connections are connected to the conductive enclosure.
Note: All non-isolated transducers must have a galvanic connection to each other and be
locally connected to the ground potential.