Application

The 3RK3 modular safety system (MSS) is a freely parameterizable modular safety relay. Depending on the external circuit version, safety-related applications up to Performance Level e according to EN ISO 13849-1 or SIL 3 according to IEC 62061 can be realized.

The modular safety relay enables the interconnection of several safety applications.

The comprehensive error and status diagnostics provides the possibility of finding errors in the system and localizing signals from sensors. Plant downtimes can be reduced as the result.

The MSS comprises the following system components:

• Central units
• Expansion modules
• Interface module
• Diagnostics module
• Parameterization software
• Accessories

Central units

MSS Basic

The 3RK3 Basic central unit is used wherever multiple safety functions need to be evaluated and the wiring parameterization of safety relays would involve great cost and effort. It can input entries, trigger outputs and communicate via an interface module with higher-level control systems. The central unit processes the entire safety program of an application. The 3RK3 Basic central unit, as the smallest expansion level, is able to function as a standalone application, without the optional expansion modules installed.

MSS Advanced

The 3RK3 Advanced central unit is the next higher expansion of the Basic central unit for AS-i safety monitor functionality. It integrates expanded functionalities and project data volume in addition to the AS-Interface, which facilitates using the multitude of options available for this bus system. You have the option of activating its use in the central unit.

The service-proven insulation piercing method of AS-Interface enables not only the distributed expansion of the project data volume using safe AS-i outputs, safe AS-i sensors and other
 MSS Advanced or safety monitors (F cross traffic) but also a highly flexible adaptation of the application, e.g. very fast connection of AS-i outputs, EMERGENCY STOP command devices, position switches with and without tumbler, or light curtains.

Safety-orientated disconnection using MSS or by distributed means using safe AS-i outputs and the formation of switch-off groups can be realized very easily. The same applies for any subsequent modifications. They are now possible by simply readdressing, meaning that rewiring is no longer necessary.

The AS-i Bus is connected directly at the central unit.

MSS ASIsafe

The MSS ASIsafe basic and MSS ASIsafe extended central units are a logical development of the AS-i safety monitors based on the 3RK3 Modular Safety System.

Like MSS Advanced, MSS ASIsafe detects – in a comparable way to the safety monitors – safe sensor technology on the AS-i bus and switches actuators off in a safety-related manner via a configurable safety logic. It stands out by virtue of its greater project data volume, wider range of functions and the possibility of increasing the the integrated I/O project data volume by means of expansion modules from the MSS system family. In this case the range of functions, such as the number and type of the logic elements that can be interconnected, is equivalent to that of MSS Advanced.

Expansion modules

With the optional expansion modules, both safety-related and standard, the system is flexibly adapted to the required safety applications.

Interface module

The DP Interface module transfers diagnostic and device status data into a higher-level PROFIBUS network, e. g. to facilitate its display on a HMI. 32-bit cyclic data is exchanged via the Basic central unit and controls. If an Advanced/ASIsafe central unit is used, the number is doubled to 64-bit cycle data. In acyclic mode, both central units can call up diagnostic data.

Diagnostics module

Actuated sensors or faults, e.g. cross-circuit, are indicated directly on the diagnostics display. The fault is diagnosed directly in plain text by the detailed alarm message. The device is fully functional at delivery. No programming is required.

Parameterization software

Using the SIRIUS Safety ES graphical parameterization tool it is very easy to create the safety functions as well as their logical links on the PC. You can define disconnection ranges, ON-delays, OFF-delays and other dependencies for example.

SIRIUS Safety ES also offers comprehensive functions for diagnostics and commissioning. Documentation of the MSS hardware layout and the parameterizable logic is drawn up automatically.

System design with Basic central unit

System design MSS with Advanced central unit

System design MSS as a combination of various central units with AS-Interface

Article No. scheme

Note:

The Article No. scheme shows an overview of product versions for better understanding of the logic behind the article numbers. For your orders please use the article numbers quoted in the selection and ordering data.