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1.7
Brief description
The actuator-sensor interface (AS-i) has established itself as a system for networking
primarily binary sensors and actuators at the lowest level of the automation hierarchy.
The high number of installed systems, the ease of use and the reliable operating
behaviour also make the AS-i interesting in the area of machine safety.
The safe AS-i system is intended for safety applications up to Category 4 in
accordance with EN 954-1. Mixed operation of standard components and safe com-
ponents is possible.
Notice!
A brief description of the safe AS-i transmission can be found in Chapter 12 at the end
of this operating manual.
The AS-i safety monitor monitors within an AS-i system the safe slaves which have
been assigned according to the configuration specified by the user with the configura-
tion software. Depending on the device model, up to two dependent or independent
OSSDs, each with external device monitoring circuit, are available. In the event of a
stop request or a defect, the AS-i safety monitor safely switches off the system in
protective operation mode with a maximum reaction time of 40ms.
a
f
g
a
=
Standard PLC with standard
AS-i master
b
=
Standard I/O-module
c
=
Safety monitor
d
=
Safety E-STOP push button
e
=
Safety I-module
Fig. 1.7-1: Safe and standard components in an AS-i network
Multiple AS-i safety monitors can be used within an AS-i system. In this way, a safe
slave can be monitored by multiple AS-i safety monitors.
c
b
h
ASM1, ASM1E
d
i
f
=
AS-i power supply unit
g
=
Safety light barrier
h
=
Safety light grid
i
=
Standard I/O-module
j
=
Safety position switch
e
j
71
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