Connection Of The Load Voltage Reference Potential - Siemens CPU 313C Hardware And Installation Manual

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Numerous output modules require an additional load voltage for switching control
devices.
The table below shows how to connect the load voltage reference potential M
for the various configuration versions.
Table 5-9
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grounded
ungrounded Connect M
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03

Connection of the load voltage reference potential

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Connect M with M
external
on the CPU
with M
external
on the CPU
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Connect or do not connect
M to the common
external
grounding line
Connect or do not connect
M to the common
external
grounding line
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external
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-
Ungrounded
installation with
CPU31xC not possible
5-25