Configuration With Non-Isolated Modules - Siemens S7-300 Installation Manual

&RQILJXULQJ
1RQLVRODWHG PRGXOHV
In configurations with non-isolated modules, the reference potentials of the control
circuit (M
figure below ).
([DPSOH RI QRQLVRODWHG PRGXOHV
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.
PS
L1
L1
N
N
PE
Ground bus in cabinet
L+
M
external
DC 24 V load power supply
Figure 5-10 Configuration with non-isolated modules
5-24
) and load circuit (
internal
analog
S7-300 CPU
µ P
L+
M
M
1mm
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
external) are not electrically isolated (see the
M
to the CPU's chassis ground.
4AI/2AO
D
A
M
analog
+
2
V
A
U
internal
Data
M
internal
D
A
+
A5E00203919-01