Siemens S5-135U/155U Manual De Usuario

7-9

System Manual
C79000-G8576-C199-06

The IM 301 is used to connect I/O modules and signal preprocessing modules
(IPs) to a CC in a distributed arrangement (allowing for possible
configurations) via an

EU 183U

EU 185U (only input/output modules)

expansion unit.

You can connect up to four EUs to a CC in distributed arrangement via the
IM 301. If you use the 721 connecting cable, the total cable length from the
CC to the last EU may be up to 200 m. The distributed connection is made
via the lower front connector of the module. Use the IM 310 interface
module in the EU to be connected in a distributed arrangement:

IM 301

EU 183U, 
EU 185U (only I/O
modules)

 IM 310

Apart from the distributed EUs, you can connect the following expansion
units in a centralized arrangement:

EU 183U

EU 184U

EU 187U

The centralized connection is made via the upper front connector of the
module. Use the following interface modules, according to the EU to be
connected in a centralized arrangement:

IM 301-5

 EU 184U, EU 187U

 IM 312-5

IM 301-3

 EU 183U

 IM 312-3

Unused centralized connections of the IM 301-3 and unused distributed
connections of the IM 301-3 and IM 301-5 must be terminated with
terminators. The same applies to the last IM 310.

You may only set module addresses in the EU which you are not yet using in
the CC. This applies to the normal (P) and extended (O) areas.

Interface Modules