Siemens SIRIUS 3RK3 - System Components

Overview
3.3 System components
Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
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3.3 System components
Central unit
For every system configuration you require a central unit (e.g. 3RK3 Basic). For executing
the safety functions, the central unit contains the parameterization data in a plug-in memory
module. The expansion modules and/or an interface module or the diagnostics module are
connected to the central unit.
The following table lists the properties of the central unit:
Central unit Inputs / outputs Maximum number of expansion
modules
3RK3 Basic
Central unit with safety-
related inputs and outputs
8 fail-safe digital inputs
1 two-channel fail-safe relay output
1 two-channel fail-safe digital output
7
Expansion modules
You need expansion modules to adapt the MSS to the required application. You thereby
supplement the central unit with additional safety-related inputs and outputs, for example.
The following table lists the expansion modules and their properties:
Expansion module Description Inputs / outputs
4/8F-DI Safety-related expansion module 8 fail-safe digital inputs
2/4F-DI 1/2F-RO Safety-related mixed expansion module 4 fail-safe digital inputs
2 single-channel, fail-safe relay outputs
2/4F-DI 2F-DO Safety-related mixed expansion module 4 fail-safe digital inputs
2 two-channel fail-safe digital outputs
4F-DO Safety-related output module 4 fail-safe digital outputs
4/8F-RO Safety-related output module 8 fail-safe relay outputs
8DI Standard input module 8 digital standard inputs
8 DO Standard output module 8 digital standard outputs
Interface modules
You need interface modules for exchanging data between the MSS and higher-level bus
systems (e.g. PROFIBUS DP).
The DP interface is the interface module for MSS. It has the following properties:
● The DP interface forms the interface between the MSS and an automation system via
PROFIBUS DP.
● The interface module is connected to the central unit.
● A diagnostics module or a PC / PG can be connected to the interface module.