3.2 Applications
The 3RK3 Modular Safety System is a modular safety relay. Depending on the version of the
external wiring with sensors and actuators, applications can be implemented up to SIL3 as per
EN 61508 or PL e as per EN ISO 13849‑1.
Application areas and use
• The MSS 3RK3 can be implemented in any protective application with three or more 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 dene other dependencies.
• With suitable safety-related expansion modules, you can adapt the system exibly to the
required safety application.
• With extensive fault diagnostic features and the provision of status information, faults can be
quickly located and the commissioning and down times of the system reduced.
• Test operation for support during commissioning. Hier signals can be forced to test the logic
processing or system sections already installed. That means that the signals in the logic can
be set to 1 or 0, irrespective of the real signal.
• Fault diagnostics and status information can be transferred to higher-level bus systems (e.g.
PROFINET IO) through an optional interface module.
• The 3RK3 central units with AS-i interface also perform the functions of an AS-i safety
monitor. These central units can read in safety-related, standard, AB, and CTT3 data on the
AS-i bus, control safe outputs on the AS‑i bus, and simulate safety-related standard and AB
slaves. Diagnosis of the system is possible through the AS‑i using the CTT2 protocol.
System components
The MSS 3RK3 consists of the following system components:
• Central unit
• Expansion modules
• Interface module
• Diagnostics display
• Parameterization software
• Accessories
Overview
3.2 Applications
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006 37
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