Siemens SIMATIC ET 200M Operating Instructions Manual page 46

Assignment planning
3.5 Configuring the mechanical structure
• 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 bus module BM PS/IM or BM
IM/IM. The backplane bus cover has to be ordered.
①
②
Figure 3-8
• To use the ET 200M in the intrinsically safe area, use the explosion-proof partition -
preferably between the modules in the intrinsically safe area and the modules in the non-
intrinsically safe area.
Greater number of modules with the IM 153-2BAx2 and IM 153-4AA0x
A maximum of 12 modules can be operated with the IM 153-2BAx2 and IM 153-4AA0x
interface module, compared to 8 modules previously.
Restrictions
Use of the high-accuracy time stamp (1 ms accuracy) is only possible with 8 modules. In this
case, a maximum of 8 input modules can be inserted after the IM 153-2BAx2 interface
module in the ET 200M.
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Bus module cover
Backplane bus cover
Example: Bus module 2 x 40 (...-7HB00-)
Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M