SIEMENS
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Siemens IC 10 · 2017
SIRIUS 3RK3 Modular Safety System
General data
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Overview
SIRIUS 3RK3 Modular Safety System
The 3RK3 Modular Safety System (MSS) is a freely parameteriz-
able 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 modules
•
Diagnostics modules
•
Parameterization software
• Accessories
Central units
MSS Basic
The 3RK3 Basic central unit is used wherever several safety
functions need to be evaluated and the wiring parameterization
of safety relays would involve significant cost and effort. It reads
in inputs, controls outputs and communicates through an inter-
face module with higher-level control systems. An application's
entire safety program is processed in the central unit. The 3RK3
Basic central unit is the lowest expansion level and fully
functional on its own, without the optional expansion modules.
MSS Advanced
The 3RK3 Advanced central unit is the logical expansion of the
Basic central unit – to include the functionality of an AS-i safety
monitor. In addition to having a larger volume of project data and
scope of functionality it can be integrated in AS-Interface and
therefore make use of the many different possibilities offered by
this bus system. The function can be optionally activated 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 con-
nection of AS-i outputs, EMERGENCY STOP command devices,
position switches with and without tumbler, or light curtains.
Safety-related 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 subse-
quent modifications. They are now possible by simply read-
dressing, meaning that rewiring is no longer necessary.
The AS-i bus is connected directly to 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 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 modules
The DP interface module is used for transferring diagnostics
data and device status data to a higher-level PROFIBUS
network, e.g. for purposes of visualization using HMI. When
using the Basic central unit, 32-bit cyclic data can be ex-
changed with the control system. 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 modules
Actuated sensors or faults, e.g. cross-circuit, are indicated
directly on the diagnostics display. The fault is diagnosed di-
rectly in plain text by the detailed alarm message. The device is
fully functional upon 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 configuration and the parameterized logic is created
automatically.
More information
Home page,
see www.siemens.com/sirius-mss
Industry Mall,
see www.siemens.com/product?3RK3
© Siemens AG 2016