SIEMENS
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Siemens IC 10 · 2017
AS-Interface
ASIsafe
Introduction
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Overview
ASIsafe – Safety is included
ASIsafe enables the integration of safety-related components,
such as EMERGENCY-STOP pushbuttons, protective door
switches or safety light arrays, in an AS-Interface network. These
are fully compatible with the familiar AS-Interface components
(masters, slaves, power supplies, repeaters, etc.) in accordance
with IEC 62026-2 and are operated in conjunction with them on
the yellow AS-Interface cable.
Tested safety
The transmission method for safety-related signals is released
for applications up to PL e according to EN ISO 13849-1 and up
to SIL 3 (IEC 61508/EN 62061).
Higher-level control
As usual, nodes on the AS-Interface bus are controlled in oper-
ation by the standard program of the higher-level SIMATIC (F)
CPU or by a SINUMERIK control.
Configuring safety functions
In order to implement safe functions, the information from the
safe and standard nodes must be combined logically and
further parameters set. The configuration of the safety functions
depends on which safety solution is being used:
•
AS-i safety solution with F-CPU:
In conjunction with the modular safety AS-i master, which is
formed by combining the CM AS-i master ST and
F-CM AS-i Safety ST modules in an ET 200SP station, all safety
functions and combinations are configured via STEP 7 and
processed in the controller (F-CPU) by the fail-safe program.
•
In the case of the AS-i safety solution with local evaluation
by MSS:
In conjunction with the Modular Safety System all safety
functions and combinations are configured using the
MSS ES software and processed in the MSS central unit.
AS-i safety solution with F-CPU
AS-Interface configuration with AS-i Master modules in the ET 200SP
The AS-i communication modules in the ET 200SP facilitate
the use of AS-Interface under fail-safe SIMATIC or SINUMERIK
controllers.
The allocation of tasks is as follows:
•
Acquisition of safety-related signals via safe input slaves on
the AS-Interface bus.
Further signals can be detected through other F-DI modules
of the SIMATIC.
•
Evaluation and processing of signals via the fail-safe SIMATIC
or SINUMERIK control
•
Reacting by means of safety output modules on the
AS-Interface bus or other SIMATIC F-DQ modules
Simple combination of the CM AS-i Master ST and F-CM
AS-i Safety ST modules in one ET 200SP station results in a
powerful, safety-oriented network transition between PROFINET
(or PROFIBUS) and AS-Interface, which can be expanded
further in a modular fashion with further I/O modules of the
ET 200SP.
Using these design methods, it is possible to create configura-
tions for virtually any application. Besides the single AS-i
master,
double, triple or generally multiple masters can be realized with
or without fail-safe functionality.
Safety-oriented
processing
Operational
control
Safety switch with tumbler
Field module
Load feeder with safe AS-i outputs
Digital K45 field module
3RA2 load feeder
Safe EMERGENCY-STOP
AS-Interface
power supply
AS-Interface
power supply
AS-Interface
power supply
Safe control
e. g. SIMATIC S7-1500F
or SIMATIC S7-300F
or SINUMERIK 840D sl
ET 200SP with
CM AS-i Master ST and
F-CM AS-i Safety ST
ET 200SP with
CM AS-i Master ST and
F-CM AS-i Safety ST
IC01_00288d
AS-Interface /
ASIsafe
PROFINET / PROFIsafe
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AS-Interface /
ASIsafe
AS-Interface /
ASIsafe
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© Siemens AG 2016