Configuring
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
4-23
Connecting the reference potential of the load voltage
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
extern
for the various configuration versions.
Table 4-9 Connecting the load voltage reference potential
Installation Non-isolated modules Isolated modules Remarks
grounded Connect M
external
with M
on the CPU
Connect or do not connect
M
external
to the common
grounding line
-
ungrounded Connect M
external
with M
on the CPU
Connect or do not connect
M
external
to the common
grounding line
ungrounded operation
of CPU31xC and
312 IFM is not
possible
4.8.6 Overview: Grounding
CPU 31xC
The figure below shows you the complete assembly of an S7-300 with CPU 31xC
with a power supply from TN-S mains.
Apart from powering the CPU, the PS 307 also supplies the load current for the 24
VDC modules.
Note: The arrangement displayed does not correspond with the physical
arrangement; it was merely selected to give you a clear overview.
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