Application Planning; Forming Potential Groups With Fail-Safe Modules - Siemens SIMATIC ET 200SP Product Information

Application planning

2.1

Forming potential groups with fail-safe modules

Introduction
ET 200SP distributed I/O systems can be configured using fail-safe and non-fail-safe
modules. This chapter provides an example of a mixed configuration comprising fail-safe and
non-fails-safe modules.
Assembly example for ET 200SP with fail-safe and non-fail-safe modules
Generally speaking, it is not necessary to operate fail-safe and non-fail-safe modules in
separate potential groups. You can divide the modules into fail-safe and non-fail-safe
potential groups and mount them.
The following diagram shows an assembly example with fail-safe and non-fail-safe modules
within a single ET 200SP.
①
②
③
④
⑤
⑥
⑦
⑧
⑨
Figure 2-1
ET 200SP distributed I/O system
Product Information, 07/2013, A5E32288220-AA
Interface module IM 155-6 PN HF
F-module
Non-fail-safe module
Power module F-PM-E 24VDC/8A PPM ST
Mixed fail-safe and non-fail-safe potential group with BaseUnits BU15..D and BU15..B.
You achieve SIL3/Cat.4/PLe for the fail-safe modules.
Non-fail-safe potential group with BaseUnits BU15..D and BU15..B.
Fail-safe potential group with BaseUnits BU20..D and BU15..B.
Through disconnection of the power bus, and thus of the non-fail-safe modules, up to
SIL2/Cat.3/PLd is possible.
Server module
P1/P2 power buses
ET 200SP assembly example with fail-safe modules
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