Wiring And Fitting Modules; Introduction; Safe Functional Extra Low Voltage For Fail-Safe Modules - Siemens PM-E F pm DC24V PROFIsafe Installation And Operating Manual

Et 200s distributed i/o system - fail-safe modules
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Wiring and Fitting Modules

4.1

Introduction

In order to prevent hazardous risks to persons or to the environment, you must not under
any circumstances override safety functions or implement any measures that cause safety
functions to be bypassed or that result in the bypassing of safety functions. The
manufacturer is not liable for the consequences of such manipulation or for damages that
result from failure to heed this warning.
This chapter
This chapter covers the special features involved in wiring and fitting fail-safe modules.
Information about this subject that applies to both ET 200S with fail-safe modules and ET
200S with standard modules can be found in the
instructions.
4.2

Safe Functional Extra Low Voltage for Fail-Safe Modules

Safe Functional Extra-Low Voltage
Fail-safe modules must be operated with safe functional extra-low voltage (SELV, PELV).
This means that these modules, even in the event of a fault, can only have a maximum
voltage of U
U
m
You can find additional information about safe functional extra-low voltage in the data
sheets, for example, of the applicable power supplies.
All system components that can supply electrical energy in any form whatsoever must fulfill
this condition.
Each additional power circuit (24 VDC) installed in the system must be operated on safe
functional extra-low voltage (SELV, PELV). Refer to the relevant data sheets or contact the
manufacturer.
Sensors and actuators with an external power supply can also be connected to F-modules.
Make sure here, too, that power is supplied to these components from safe functional extra-
low voltage. The process signal of a 24 VDC digital module may not exceed a fault voltage
U
m
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
WARNING
WARNING
. The following applies for all fail-safe modules:
m
< 60.0 V
in the event of a fault.
ET 200S Distributed I/O System
4
operating
33

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