Siemens SIMATIC ET 200AL System Manual page 29

Connecting
5.2 Operation of the ET 200AL on grounded/non-grounded infeed
ET 200AL in the overall configuration
The figure below shows the ET 200AL distributed I/O system in the complete electrical
configuration using the example of an interface module.
①
②
③
④
Figure 5-1
28
Main switch
Short-circuit and overvoltage protection
Fuses for cable protection (automatic circuit breaker for 4 A)
When configuring the ET 200AL distributed I/O system with non-grounded reference potential,
no connection is made between 1M, 2M and FE.
Electrical configuration
Distributed I/O system
System Manual, 08/2019, A5E31861578-AG