Siemens S7-300 Installation And Operating Manual page 301

Configuration of ET 200M with safety protector on the active backplane bus
The bus module for the safety protector increases the width of ET 200M by 80 mm. You can
still install eight to twelve signal modules. Note that you need the mounting rail for "Module
replacement during operation" (order no. 6ES7195-1GX00) for the installation. The example
below shows a configuration with seven signal modules.
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①
Power supply
②
IM 153-2
③
Standard signal modules
④
Bus module for safety protector
⑤
Safety protector
⑥
Fail-safe signal modules
Figure 10-4 Configuration of ET 200M with safety protector on the active backplane bus
Note
Measures to be taken for overvoltage protection in safety mode:
 Always insert the standard signal modules on the left side of the safety protector; fail-safe
 Ground the mounting rail.
 Bond the safety protector to functional ground. Interconnect pins 19 and 20 on the 20-pin
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
3 4
signal modules are inserted on its right side.
front connector of the safety protector with the mounting rail using one cable each of the
shortest possible length (conductor cross-section = 1.5 mm
5 6
Safety protector
10.3 Configuration Variants
).
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