Siemens SIMATIC ET 200AL System Manual page 204

Safety-related shutdown of ET 200AL IO-Link
modules
Introduction
The following structure describes how to shut down ET 200AL IO-Link modules in a fail-safe
manner.
In the configuration shown in the diagram below (e.g. with the safety shutdown device
3SK1), all digital outputs that are connected to the 2L+ and 2M supply (24 V switched) of the
ET 200AL IO-Link modules are switched to the safe OFF state. This step achieves the safety
class SIL2/Category 3/PL d.
Principle of operation
The higher-level safety shutdown device (e.g. 3SK1) disconnects the supply 2L+ and
2M switched. The digital outputs of the ET 200AL IO-Link modules operated on the 2L+ and
2M (24 V switched) supply are switched to the safe state.
There are two ways to connect the 2L+ and 2M supply voltage to an IO-Link module.
• Via the IO-Link master Port Class B
• Via the M12-L plug for the supply voltage
IO-Link I/O modules
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