Installing the S7-400
2-3
AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Connecting the CR and ER(s)
Toconnect one or more ERs to a CR, you must fit one or more send IMs in the CR.
The send IMs have two interfaces. Youcan connect one chain of up to four ERs to
each of the two interfaces of a send IM in the CR.
DifferentIMs areavailable for local connection and remote connection.
Connecting witha5VSupply
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 5A 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 RemoteConnection
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 4144
Max. distance 5m 1.5m 102.25 m 605 m
5 V transfer No Yes No No
Max. current transfer per inter-
face -- 5A -- --
Communication bus transmission Yes No Ye s No