Overview; Introduction - Siemens Sirius 3RK3 System Manual

Overview

3.1

Introduction

The Modular Safety System (MSS) 3RK3 is a modular safety relay. Depending on the
version of the external wiring, applications can be implemented up to Category 4 in
accordance with EN 954-1 or SIL3 in accordance with IEC 61508 / PL e in accordance with
DIN EN ISO 13849-1:2006.
Application areas and use
● The MSS can be implemented in any protective application with more than three safety
functions.
● The modular safety relay enables you to interconnect several safety applications with
each other. In this way, you can set shutdown ranges, for example, and define other
dependencies.
● With suitable safety-related expansion modules, you can adapt the system flexibly to the
required safety application.
● The extensive fault and status diagnostics system makes it possible to find faults in the
system and to check signals from sensors. This helps reduce plant commissioning times
and downtime.
● Diagnostics data are transferred to higher-level bus systems (e.g. PROFIBUS DP) via an
optional interface module. This data is then available for further processing in the
programmable controller.
System components
The MSS consists of the following system components:
● Central unit
● Expansion modules
● Interface module
● Diagnostics module
● Parameterization software
● Accessories
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
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