Siemens SIMATIC S7-400 Hardware And Installation Manual page 107

9. Connect the 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
Figure 4-19
10.Plug the terminator into the lower female connector of the receive IM in the last
ER of the chain (see Reference Manual , Chapter 7).
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Receive IM
Connection Between a Send IM and Two Receive IMs
Wiring the S7-400
Receive IM
Terminator
4-45