Specifications

AS-Interface
ASIsafe
Introduction
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Siemens IK PI · 2012
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■ Overview
Secure communication and standard communication on AS-Interface
Safety is included
The ASIsafe concept supports the integration of safety-related
components, such as EMERGENCY-STOP switches, protective
door switches or safety light arrays, in the AS-Interface network.
These are fully compatible with the familiar AS-Interface compo-
nents (masters, slaves, power supplies, repeaters, etc.) in ac-
cordance with IEC 62026 and are operated in conjunction with
them on the yellow AS-Interface cable.
A failsafe controller or a special master is not required. The mas-
ter regards safety slaves like all other slaves and receives the
safety data solely for information purposes. All existing
AS-Interface networks can thus be expanded.
ASIsafe makes sure that a maximum response time of 40 ms can
be achieved. This is the time between the signal being applied
to the input of the safe slave and the output on the safety monitor
being switched off. With distributed disconnection through a
safe AS-i output, the response time is extended by the time
(30 ms) which the safe AS-i output requires in addition to the
disconnection to a total of 70 ms (worst case).
Tested safety
The system was tested and approved by TÜV (Germany), NRTL
(USA) and INRS (France). The transmission procedure for
safety-oriented signals is configured for implementing applica-
tions up to Category 4 according to EN 954-1, up to PL e accord-
ing to EN ISO 13849-1 and up to SIL 3 according to
IEC 62061/IEC 61508.
Design
The design of the safety systems is identical to the wiring of
AS-Interface as it is known today.
The family of safe AS-Interface products includes the safety
monitor which monitors or disconnects the safe stations. The
range of safe stations comprises the safety modules and the
safety-related sensors with integrated interface. Sensors, moni-
tors and safe AS-i outputs can be connected to any points of the
AS-Interface network. Also, several monitors can be used on
one network.
The ASIsafe components and their signal flows
Standard PLC
Standard-Master
Standard-
Slave
Safety monitor
Safe slave with
EMERGENCY STOP
Power
supply unit
Signal evaluation of slave/safety monitor
AS-i POWER
AS-Interface
NSA0_00005f
Standard
slave
Standard
slave
Standard
slave
AS-i
power
supply unit
Standard PLC and
standard master
Extended ASIsafe diagnostics (through regular I/O transfer)
AS-Interface cable
Signal evaluation of safe input slave/ safety monitor/
or safe disconnect signal to the safe AS-i output
Safe
input slave
Safety monitor
Safe AS-i
outputs
The components of ASIsafe
Standard PLC and
standard AS-i master:
Central installation
at the PLC and
distributed installation
using DP-AS-i Links is
possible.
Safety monitor:
The safety monitor
evaluates all safe inputs on
the AS-i bus and ensures
safe disconnection.
Safe input slave:
Safe signals are made
available through the safe
slaves and e. g. to the
safety monitor for
evaluation.
Safe AS-i outputs:
The disconnection signal
from e. g. the safety
monitor can be used via
ASIsafe for the safety-
oriented disconnection of
distributed safe AS-i
outputs.
NSB0_01509c
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© Siemens AG 2011