Siemens SIMATIC S7-400 Hardware And Installation Manual page 203

Figure 8-9 Module Assembly Comprising CPU and Expansion Modules
Warning
!
The connector pins can be damaged.
If the modules are not exactly lined up for interconnecting, the pins can be
damaged.
Line up the modules precisely when interconnecting.
Latching Modules with Connecting Terminals
Latch the interconnected modules with the two enclosed connecting terminals
(Figure 8-10), in order to protect them against being shifted or becoming skewed.
To do this, proceed as follows:
1. As shown in Figure 8-11, slide a connecting clip from above between the two
modules to be secured until the bent clip ends touch the housing cover of the
modules.
2. Align the connecting clips so that each bent clip end is situated over a grid hole
of the module housing cover. Here, the first bent terminal end should be over
the fifth notch space, counting from the back of the modules.
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Assembling the M7-400
Level surface
8-21