Siemens S7-400 - page 96

Wiring the S7-400
4-36 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
7. Openthe cover of the first receive IM (interface module in the ER).
8. Plugthe free end of the connecting cable into the upper male connector
(receive interface) of the receive IM and screw the connector on.
9. Connectthe remaining receive IMs by connecting one send interface (lower
female connector X2) to one receive interface (upper male connector X1) in
each case.
Send IM Receive IM ReceiveIM
Terminator
Figure 4-23 Connection Between a Send IM and TwoReceive IMs
10.Plug the terminator into the lower female connector of the receive IM in the last
ER of the chain (see Reference Manual Module Specifications, Chapter 6).