Siemens Automation System S7-400 - Manual (Page 95)

Wiring the S7-400
4-35
Automation System S7-400 Hardware and Installation
A5E00850741-01
4.20 Interconnecting the CR and ER(s)
Interconnecting the Interface Modules
When you assemble an automation system comprising a CR and one or more ERs,
you connect the racks via the connecting cables of the interface modules.
To interconnect the interface modules:
1. Ensure that all the connecting cables needed for the programmable controller
are ready. Allow for the maximum cable lengths permitted for your assembly
(see Chapter 2) and check that you have the correct cables
(see Reference Manual Module Specifications, Chapter 6).
2. Start with the send IM (the interface module in the central rack).
3. Open the cover of the send IM.
4. Plug the male connector of the first connecting cable into one of the female
connectors of the send IM and screw-tighten it.
Figure 4-22 Plugging a Connecting Cable into a Send IM
5. If you wish to interconnect two ERs segments to this send IM, plug the
connector of the second connecting cable into the second port of the send IM.
6. Close the cover of the send IM.