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Expansion of Basic System with External I/Os
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 5-23 shows a simplified connection of galvanically isolated I/Os.
1L+
1M
Figure 5-23. Simplified Representation of a Floating, External I/O Connection
5-26
S5-95F
basic unit
L1
N
•
•
•
•
S5-95F
+9 V
•
Data
GND
2L+
2M
•
EWA 4NEB 812 6210-02
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