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Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual Page 84

Et 200s distributed i/o system - fail-safe modules.
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Fail-Safe Modules
7.3 PM-E F pp DC24V PROFIsafe power module
Switching the P2 Voltage Bus
The power module is capable of fail-safe switching the P2 voltage bus by means of two
series-connected relay contacts in accordance with SIL2/Category 3/PLd or SIL3/Category
4/PLe. P2 is available as P on the terminal module, and P1 as M.
Power Module Supplies for Standard ET 200S Modules
Always connect the 24 VDC supply for the standard ET 200S modules on the PM-
E F pp DC24V PROFIsafe. Otherwise, the outputs of DO modules may exhibit safety
critical behavior.
When supplying standard DO modules, always use the terminal modules to supply the
actuators (actuator feedback on the DO module).
Redundant ground conductor required
The ground conductor to the terminal module for PM-E F pp DC24V PROFIsafe must be
installed twice for safety reasons. Any interruption of a single ground conductor would
prevent the safety-related shutdown of voltage bus P2.
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07


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