Siemens SIMATIC ET 200M

Wiring
5-15
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
5.2.2 Wiring the Power Supply and IM 153-x
Power Cables
To wire the power supply, use flexible cables (see Table 5-2 on page5-13).
If you use only one cable per connection, you don’t need an end ferrule.
Jumper
Use the jumper when wiring the PS 307 power supply module to the IM 153-x. The
jumper comes with the power supply module.
Other 24 V Connections
Above the jumper on the power supply PS 307 there are still a number of free 24 V
connections for the supply to the S7-300 I/O modules.
Wiring the 24 V Connections with a Redundant Configuration with 2 IM 153-2
Note
If you reverse the polarity of L+ power supply when wiring the IM 153-2 in a
redundant configuration, short-circuiting will occur via the frame connection. The
reason for this: Both IM 153-2 have a common ground cable via the bus module
BM IM/IM.
With IM 153-2AA02/-2AB01:
In a redundant configuration we recommend that you fuse the L+ supply before
the IM 153-2 with 2.5 A.
With IM 153-2Bx00:
 In configurations with ungrounded reference potential (jumper between M and
functional ground removed, see Figure 5-3), an internal electronic fuse which
regenerates after approx. 30 seconds is triggered in the event of polarity
reversal.
 In configurations with grounded reference potential (jumper inserted between M
and functional ground), the short-circuit current flows through these jumpers
and the functional grounds in the event of polarity reversal.
The IM 153-2 is not damaged if fuse protection configured for the cross-section
of the connecting cable is provided upstream of the module.
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