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Siemens IK PI · 2015
AS-Interface
Introduction
Communication overview
4
■
Overview
AS-Interface is an open, international standard according to
EN 50295 and IEC 62026-2 for process and field communica-
tion. Leading manufacturers of actuators and sensors all over
the world support the AS-Interface. Interested companies are
provided with the electrical and mechanical specifications by
the AS-Interface Association.
AS-Interface is a single master system. For automation systems
from Siemens, there are communications processors (CPs) com-
munications modules (CMs) and network transitions (links) that
control the process or field communication as masters, and ac-
tuators and sensors that are activated as AS-Interface slaves.
■
Benefits
A key feature of AS-Interface technology is the use of a shared
two-conductor cable for data transmission and the distribution of
auxiliary power to the sensors/actuators. A power supply unit
which meets the requirements of the AS-Interface transmission
method and has an external data decoupling module if required
is used for the distribution of auxiliary power. The AS-Interface
cable used for the wiring is mechanically coded and hence pro-
tected against polarity reversal and can be easily contacted by
the insulation piercing method.
Elaborately wired control cables in the control cabinet and mar-
shalling racks can be replaced by AS-Interface.
The AS-Interface cable can be connected to any points thanks
to a specially developed cable and connection by the insulation
piercing method.
With this concept you become extremely flexible and achieve
high savings.
■
Application
I/O data exchange
The AS-i master transmits automatically the inputs and outputs
between the control system and the digital and analog
AS-Interface slaves.
Slave diagnostics information is forwarded to the control system
when required.
The latest AS-Interface masters according to the AS-Interface
Specification V3.0 support integrated analog value processing.
This means that data exchange with analog AS-Interface slaves
is just as easy as with digital slaves.
Command interface
In addition to I/O data exchange with binary and analog
AS-Interface slaves the AS-Interface masters provide a number
of other functions through the command interface.
Hence it is possible, for example, for slave addresses to be is-
sued, parameter values transferred or configuration information
read out from user programs.
For more information see
http://support.automation.siemens.com/WW/view/en/51678777.
Control and
monitoring system
Telecontrol and
substation control
Remote access,
e.g. via
teleservice
Control and
monitoring system
Field device for
intrinsically safe area
Coupler
Field devices
Code
reading
systems
RFID
system
Telecontrol and
substation
control
S7-1200 with
CP 1242-7
Compact
starter
Compact
starter
Compact
feeder
Field devices
Field device
Power
supply
Signalling column
Power
supply
Code
reading
systems
IO-Link
master
RFID
system
Compact
starter
Protection and
monitoring
devices
Protection and
monitoring
devices
IO-Link
module
IO-Link
module
RFID system
RFID system
PC/PG/IPC
Controller
Industrial Ethernet
PROFIBUS
PROFIBUS PA
Laptop
Motion Control
Systems
Notebook
SINAMICS
Drives
Numeric
Control
Mobile
Panel
SIMOCODE
pro
PROFINET
ASM456
Controller
PC/PG/IPC
Controller
Security
Link
Drives
PC/PG
Mobile
Panel
IWLAN
Controller
Database
Server
DP-Slave Motion Control
Systems
Controller
LOGO!
Slaves Slaves
AS-Interface
Link
RF180C
Access
Point
Link
Industrial Ethernet
Switches
IWLAN
RCoax Cable
G_IK10_XX_20002
Controller
Numeric Control
Controller
Access
Point
Client
Module
PC
Wireless
Devices
Access
Point
IKPI_04_en.book Seite 2 Montag, 6. Oktober 2014 11:32 11
© Siemens AG 2014
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