Configuration With Non-Isolated Modules - Siemens CPU 313C Hardware And Installation Manual

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When non-isolated modules are installed, the reference potentials of the control
circuit (M
([DPSOH
For operation with an SM 334 AI 4/AO 2 analog I/O module you must connect one
of the grounding terminals M
The figure below shows a sample configuration of an S7-300 CPU with non-
isolated modules.
L1
N
PE
L+
M
external
DC 24 V load power supply
Figure 5-10 Configuration with non-isolated modules
5-22
) and analog circuit (M
internal
analog
S7-300 CPU
PS
µ P
L1
L+
M
N
M
Ground bus
in cabinet
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
) are not electrically isolated.
analog
to the CPU's chassis ground.
4AI/2AO
D
A
M
+
2
1 mm
V
A
U
internal
Data
M
internal
D
A
analog
+
A5E00105492-03