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When you have a non-floating configuration, you must make certain that the voltage drop on
cables and does not exceed 1 V. If 1 V is exceeded, the reference potentials could change
and the modules could malfunction.
Warning
If you use non-floating I/O modules, you must provide an external connection between
the chassis ground of the non-floating I/O module and the chassis ground of the CPU.
Example of a Floating Configuration with Digital Modules
Floating configuration is required in the following situations.
•
When you need to increase interference immunity in the load circuits
•
When load circuits cannot be interconnected
•
When you have AC load circuits
If you have a floating configuration, the PLC's control circuit and the load circuit must be galvanically
isolated.
Figure 3-23 shows a simplified connection of galvanically isolated I/Os.
Central
grounding point
Load power
supply
Figure 3-23.
Simplified Representation of a Galvanically Isolated Connection of the
I/Os to the S5-100U
EWA 4NEB 812 6120-02
PS
CPU
L+
M
L+
M
3-27
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