Siemens ISI EN 50295 Brochure page 3

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Function
Operating modes
In general, the master interfaces distinguish between the follow-
ing operating modes:
I/O data transfer
The inputs and outputs of the binary AS-Interface slaves are
read and written in this operating mode.
Analog value transmission
The AS-Interface masters according to the Complete
AS-Interface Specification V2.1 support integrated analog value
processing. This means that data exchange with analog
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Design
Process or field communication
AS-Interface is used wherever individual actuators and sensors
are physically distributed throughout the machine (e.g. in a bot-
tling plant or on a production line).
AS-Interface replaces complicated wiring harnesses and con-
nects binary and analog actuators and sensors, such as proxim-
ity switches, valves or indicator lights, to a controller (e.g. SI-
MATIC) or PC.
Example of a system configuration
AS-Interface slaves (according to analog profile 7.3 or 7.4) is just
as easy as with digital slaves.
Command interface
In addition to the I/O data exchange with binary and analog AS-
Interface slaves, the AS-Interface masters offer a range of addi-
tional functions through the command interface.
This means that, from user programs, slave addresses can be
assigned, parameter values can be transferred and diagnostic
information can be read out.
In practice this means: The installation runs without problems
because data and power are transported through a single com-
mon cable. No specialist know-how is required for installation
and startup. In addition, the simple installation and clear struc-
turing of the wiring and special cable design not only consider-
ably reduce the risk of faults but also reduce service and main-
tenance costs.
AS-Interface
Introduction
Configuration examples
Siemens IK PI · 2004 6/3
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