Siemens SIMATIC PCS 7 Operating Instructions

2.3.4 Configuration of the ET 200PA SMART with isolated modules
Definition
In a configuration with isolated modules, the reference potentials are electrically isolated from
the control circuit (M
internal
) and load circuit (M
external
) (refer also to the following figure).
Application area
You use electrically isolated modules for:
● all AC load circuits
● DC load circuits with separate reference potential, e.g.
– DC load circuits, the encoders for which have different reference potentials (e.g. if
grounded encoders are used far away from the controller and an equipotential bonding
isn´t possible)
– DC load circuits, the positive pole (L +) of which is grounded (battery circuits).
Isolated modules and grounding concept
You can use isolated modules irrespective of whether of not the reference potential of the
ET 200PA SMART is grounded.
Configuration with isolated modules
The following figure shows the potential relations of an ET 200PA SMART configuration with
isolated input and output modules.
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Assignment planning
2.3 Configuring the electrical structure
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB 29

Siemens SIMATIC PCS 7 Specifications

General

Brand	Siemens
Model	SIMATIC PCS 7
Category	Control Systems
Language	English