Siemens Automation System S7-400 User Manual

Page 19

Installing the S7-400

2-3

Automation System S7-400 Hardware and Installation

A5E00850741-01

Connecting the CR and ER(s)

To connect one or more ERs to a CR, you must fit one or more send IMs in the CR.

The send IMs have two interfaces. You can connect one chain of up to four ERs to
each of the two interfaces of a send IM in the CR.

Different IMs are available for local connection and remote connection.

Connecting with a 5 V Supply

For a local connection with the IM 460-1 and IM 461-1, the 5 V supply voltage is
also transferred via the interface modules. There must therefore be no power
supply module inserted in an ER connected to an IM 460-1/IM 461-1.

Up to 5 A may flow through each of the two interfaces of an IM 460-1. This means
that each ER connected via an IM 460-1/461-1 can be powered with a maximum of
5 A at 5 V. For further details, see the Reference Manual, Chapter 6.

Overview of the Connections

Observe the connection rules at the end of this section.

Local Connection

Remote Connection

Send IM

460-0

460-1

460-3

460-4

Receive IM

461-0

461-1

461-3

461-4

Max. number of connectable

EMs per chain

Max. distance

5 m

1.5 m

102.25 m

605 m

5 V transfer

Yes

Max. current transfer per inter-

face

5 A

Communication bus transmission

Yes