Siemens SIMATIC Distributed I/O System DP/ASi Link Spécifications Page 70

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Installation
4-6
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
Use the rails for module change during operation (only these can take the
active bus modules).
Close unused slots with the backplane bus cover. Close the last bus module
with the bus module cover. The bus module cover is included with the BM
PS/IM and IM/IM bus modules. The backplane bus cover has to be ordered
(see Appendix A).
Example:
Bus module 2 40
(...7HB)
Backplane bus
cover
Bus module
cover
If you use the ET 200M in an intrinsically safe area, use an explosion-proof
partition preferably between the modules in the intrinsically safe area and the
modules in the non-intrinsically safe area.
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