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Product overview
Definitions of terms AS-Interface
Term
Master
Safety monitor
Slave
AS-iMon
Tab. 2 Definitions of terms AS-Interface
Brief description AS-i
The actuator-sensor interface (AS-i) is a system for networking sensors and actuators at the lowest
level of the automation hierarchy. It is a manufacturer-independent, open bus system and enables
data and power transmission on just one line. This simple application enables an economical design
with reliable operating performance at the same time. The network topology of the AS-i system is
arbitrary and easily expandable.
A AS-i network consists of a control unit, a so-called master, and the associated sensor and actuator
components, the slaves. The master polls all configured slaves cyclically and exchanges the input and
output data with them. A telegram consists of 4-bit user data. The master communicates with the par-
ticipants using a serial transmission protocol.
With AS-i Safety at Work, a certified standard has been developed that enables the use of safety-
related components, e. g. MS6(N)-SV-...-E-ASIS in the AS-i system. The safe AS-i system is intended
for safety applications up to category 4 according to EN ISO 13849-1PL e. Mixed operation of standard
components and safety-related components is possible. The AS-i master considers the safety-related
slaves like all other slaves and integrates them into the network. The transmission protocol and the
lines of the AS-i system are designed in such a way that they can also transmit safety-oriented tele-
grams.
The AS-i safety monitor is the central safe element and monitors the safety-related slaves assigned to
it within a AS-i system. The safety function is achieved by the additional signal transmission between
the safety-related slaves and the AS-i safety monitor. This transmission takes place using a special
security protocol.
In the event of a stop request or a defect, the AS-i safety monitor safely switches off the system in pro-
tective mode with a reaction time of max. 40 ms.
Festo — MS6(N)-SV-...-E-ASIS — 2019-05a
Description
Component for data transmission that controls the logical and temporal beha-
viour on the AS-i line.
Component that monitors the safety-related slaves and the correct function-
ing of the network. The AS-i safety monitor is configured and commissioned
via a PC/notebook with the configuration software AS-iMon.
Component for data transmission that is addressed cyclically by the master
via its address and only then generates an answer.
Configuration software for the AS-i network
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