Wiring Of Fail-Safe Modules - Siemens SIMATIC Operating Instructions Manual

Wiring

4.2 Wiring of Fail-Safe Modules

All voltage sources, for example, internal 24 V DC load voltage supplies, external 24 V DC
load voltage supplies and 5 V DC bus voltage, must be electrically connected externally.
This prevents voltage additions in the individual voltage sources that would cause the fault
voltage U
Make sure that the cable cross section is sufficient for the electrical connection, in
accordance with the ET 200pro configuration guidelines (see
Device
Power Supply Requirements for Compliance With the NAMUR Recommendation
Note
To comply with NAMUR recommendation NE 21, IEC 61131-2 and EN 298, only power
packs or power supplies (230 V AC --> 24 V DC) with a power loss ride-through of at least
20 ms can be used. The latest information about PS components can be accessed on the
Internet at:
https://mall.ad.siemens.com
These requirements also apply to power packs or power supplies not produced in ET 200pro
or S7-300/400 designs.
4.2 Wiring of Fail-Safe Modules
Same Wiring Procedure as ET 200pro
Fail-safe electronic modules and connection modules are part of the ET 200pro range of
modules. They are wired in the same way as standard modules in an ET 200pro.
For more information about wiring modules, refer to the
manual.
When assigning the F-DI module signals, remember that signals should only be routed
within a cable or a non-metallic sheathed cable if:
• A short circuit in the signals does not conceal a serious safety risk.
• Signals are supplied by different sensor supplies of this F-DI module.
Applicable Mounting Rails
Only racks for ET 200pro can be used for installing ET 200pro with fail-safe modules (see
ET 200pro Distributed I/O Device
28
WARNING
to be exceeded, even in the event of potential differences.
m
manual).
WARNING
ET 200pro Distributed I/O Device
manual).
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
ET 200pro Distributed I/O