Siemens SIMATIC ET 200AL System Manual page 9

Table of contents
Preface ................................................................................................................................................... 3
1 ET 200AL Documentation Guide .......................................................................................................... 10
2 System overview ................................................................................................................................. 14
2.1 What is the SIMATIC ET 200AL distributed I/O system? ........................................................ 14
2.2 What are fail-safe automation systems and fail-safe modules? ............................................ 17
2.3 Components ...................................................................................................................... 19
3 Application planning ........................................................................................................................... 21
3.1 Hardware configuration ..................................................................................................... 21
3.2 Configuration variants with ET-Connection ......................................................................... 22
3.2.1 ET 200AL with ET-Connection ............................................................................................ 22
3.2.2 Hybrid configuration ET 200AL/ET 200SP with ET-Connection ............................................. 24
4 Mounting ............................................................................................................................................. 26
4.1 Basics ................................................................................................................................ 26
4.2 Mounting modules ............................................................................................................ 27
5 Connecting .......................................................................................................................................... 31
5.1 Rules and regulations for operation .................................................................................... 31
5.2 Additional rules and regulations for the operation of the ET 200AL with fail-safe
modules ............................................................................................................................ 35
5.2.1 Safety extra-low-voltage (SELV, PELV) for fail-safe modules ................................................ 35
5.2.2 Requirements for sensors and actuators for fail-safe modules ............................................. 36
5.2.3 Crosstalk of digital input/output signals .............................................................................. 38
5.3 Operation of the ET 200AL on grounded/non-grounded infeed ........................................... 39
5.4 Electrical configuration of the ET 200AL ............................................................................. 42
5.5 Connecting ET 200AL to functional earth ........................................................................... 47
5.5.1 Mounting ET 200AL modules on conductive substrate ........................................................ 47
5.5.2 Mounting ET 200AL modules on non-conductive substrate ................................................. 48
5.6 Connecting cables for ET 200AL ......................................................................................... 50
5.7 Wiring ............................................................................................................................... 51
5.8 ET 200AL marking .............................................................................................................. 56
5.8.1 Factory markings ............................................................................................................... 56
5.8.2 Optional markings ............................................................................................................. 57
5.8.3 Mounting identification labels ............................................................................................ 58
6 Configuring .......................................................................................................................................... 59
Distributed I/O system
System Manual, 08/2021, A5E31861578-AJ
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