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Siemens IC 10 · 2017
AS-Interface
ASIsafe
SIRIUS 3RK3 Modular Safety System
2
■
Overview
MSS ASIsafe basic (left) and
MSS ASIsafe extended with two expansion modules (right)
The Modular Safety System (MSS) is the centerpiece of ASIsafe
Solution local. It allows a safety-related response to signals from
the ASIsafe nodes connected in the AS-i network, such as safety
input modules, EMERGENCY-STOP pushbuttons or safety
switches.
The MSS thus supports safety-related applications up to
Category 4 according to EN ISO 13849-1 or SIL 3 according to
IEC 62061.
Safe disconnection takes place via the local safety outputs of
the MSS or via the distributed safe AS-Interface outputs in the
AS-Interface network.
The safety functions are configured within the MSS using the
SIRIUS Safety ES software. The configuration can be transmit-
ted directly in the MSS via the system interface with the aid of a
PC cable or memory module. If the DP interface module is used,
transmission via PROFIBUS DP is also possible.
The MSS supports a large number of different safety functions.
These can be tailored to individual needs in the form of ready-
made function blocks.
The safety functions supported include the following:
• EMERGENCY-STOP
•
Safety shutdown mat
•
Protective door monitoring
•
Protective door tumbler mechanism
•
Approval switches
•
Two-hand operator controls
•
ESPE monitoring
• Muting
•
Mode selector switches
■
Application
All the MSS that can be used for the AS-Interface bus support
the same safety functions. Differences exist in the number of
inputs/outputs and expansion modules that can be connected,
and hence in the number of independent enabling circuits.
Several MSS can be used on the same AS-Interface bus.
AS-Interface is available in the following versions:
MSS ASIsafe basic
•
A total of up to ten independent (2-channel) enabling circuits
- Two of these enabling circuits via safety outputs integrated
into the central unit
- And another eight enabling circuits via ASIsafe,
e.g. with distributed AS-i safety outputs
MSS ASIsafe extended
•
A total of up to 20 independent (2-channel) enabling circuits
- Two of these enabling circuits via safety outputs integrated
into the central unit
- In addition, up to eight enabling circuits via a maximum of
two expansion modules
- And another ten enabling circuits via ASIsafe,
e.g. with distributed AS-i safety outputs
MSS Advanced
•
A total of up to 50 independent (2-channel) enabling circuits
- Two of these enabling circuits via safety outputs integrated
into the central unit
-
In addition, up to 36 enabling circuits via a maximum of nine
expansion modules
- and another 12 enabling circuits via ASIsafe,
e.g. with distributed AS-i safety outputs
Expandability
All versions above can be expanded by adding a DP interface
module and a diagnostics module. In addition, various safety
and non-safety expansion modules can be selected for the MSS,
and these can be used in any combination;
see page 11/37
.
Comparison of the three MSS versions
--
Not available
MSS 3RK3
ASIsafe basic
ASIsafe extended
Advanced
Number of indepen-
dent (2-channel)
enabling circuits
2 ... 10
2 ... 20
2 ... 50
Inputs
2 F-DI and 6 DI
4 F-DI and 4 DI
(expandable)
8 F-DI
(expandable)
Outputs
1 F-DO and
1 F-RO
1 F-DO and 1 F-RO
(expandable)
Number
Expansion modules
--
Up to 2
Up to 9
Connection to ASIsafe
Number of safe
AS-i outputs
Up to 8
Up to 10
Up to 12
Number of safe
AS-i inputs
Up to 31
© Siemens AG 2016