Safety-Related Shutdown; Safety-Related Shutdown Of Et 200Eco Pn M12-L - Siemens SIMATIC ET 200eco PN M12-L System Manual

Safety-related shutdown

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Safety-related shutdown of ET 200eco PN M12-L

Introduction
The setup below describes how you shut down ET 200eco PN M12-L standard modules in a
fail-safe manner.
With the illustrated setup (e.g. with safety relay 3SK1 or electronic module ET 200SP F-PM-E),
all outputs that are connected to load voltage 2L+/2M (24 V switched) of the
ET 200eco PN M12-L standard modules are switched to the safe OFF state. The
ET 200eco PN M12-L standard modules are operated at supply voltage 1L+/1M. Supply
voltage 1L+/1M is electrically isolated from load voltage 2L+/2M.
The maximum performance level achieved by the illustrated setup is SIL2/Category 3/PL d.
The component with the lowest safety standard determines the maximum performance level
a system achieves.
Principle of operation
A higher-level electromechanical safety relay (e.g. 3SK1) or an electronic fail-safe module
(e.g. ET 200SP F-PM-E) isolates the load voltage 2L+/2M (24 V switched). The outputs of the
ET 200eco PN M12-L standard modules operated at 2L+/2M (24 V switched) are switched to
the safe state. The outputs connected to 1L+/1M (24 V non-switched) are not intended for
functional switching and therefore cannot be shut down safely.
You can also integrate I/O devices that are operated exclusively at supply voltage 1L+/1M
(non-switched) in the setup of your distributed I/O system. These I/O devices must be enabled
as reaction-free modules. Reaction-free modules relay the load voltage 2L+/2M and are not
affected by a shutdown. The following schematic circuit diagrams illustrate this.
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Distributed I/O system ET 200eco PN M12-L
System Manual, 11/2023, A5E48753295-AG
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