Specifications

AS-Interface
Introduction
System overview
Communication overview
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Siemens IK PI · 2012
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■ Overview
System components
To implement the communication, a system installation has the
following main components:
• Master interface modules for central control units such as
SIMATIC S7, ET 200 M distributed peripherals, or network
transitions from PROFIBUS/PROFINET to AS-Interface
• Power supply units, if required in combination with a data
decoupling module for the power supply to the slaves
• AS-Interface shaped cables
• Network components such as repeaters and extension plugs
(cannot be used for AS-i Power24V networks)
• Modules for connection of standard sensors/actuators
• Actuators and sensors with integrated AS-i slave
• Safety modules for transmitting safety-oriented data through
AS-Interface
• Addressing units for setting the slave addresses during
commissioning
Example of a configuration with the system components
Features
24 V DC
power
supply
AS-Interface
power supply
AS-Interface
power supply
Analog and digital
K20, K45, K60 field modules
Safe position
switch with
door interlock
3RK1 safety
monitor
3RK3 Modular
Safety System
3RA2 load
feeders
3RA6
compact
starters
SIRIUS
M200D motor
starters or
G110D
frequency
converters
Load feeders
with safe
AS-i outputs
Safe
EMERGENCY-STOP
and field module
Signaling
columns
Pushbuttons
Indicator lights
Safe and standard control cabinet
modules S22.5 and S45
DP/AS-i F-Link
SIMATIC/
SIMOTION
DP/AS-i Link Advanced
DP/AS-i Link 20E
S7-300
CP343-2(P)
S7-200
CP243-2
PROFINET
AS-Interface
AS-Interface
Industrial Ethernet
PROFIBUS DP
IE/AS-i Link PN IO
G_IK10_XX_20027e
S7-300
CP343-2(P)
Standard EN 50295 / IEC 62026-2
Topology
Line, star or tree structure
(same as electrical wiring)
Transmission medium
Unshielded two-conductor cable
(2 x 1.5 mm
2
) for data and auxiliary power
Connection methods
Contacting of the AS-Interface cable
by insulation piercing method
Maximum cable length
100 m without a repeater
200 m with extension plug
300 m with two repeaters connected in series
600 m with extension plugs and two repeaters
connected in parallel
Larger cable lengths are possible when additional
repeaters are connected in parallel
Maximum cycle time 5 ms with full expansion using standard
addresses, 10 ms with full expansion using A/B
addresses, profile-specific for Spec. 3.0 slaves
Number of stations
per AS-Interface line
31 slaves acc. to AS-Interface Spec. V2.0;
62 slaves (A/B technology) acc. to
AS-Interface Spec. V2.1 and V3.0,
integrated analog value transmission
Number of binary
sensors and actuators
Max. 124 DI/124 DO according to Spec. V2.0;
max. 248 DI/186 DO according to Spec. V2.1;
max. 496 DI/496 DO according to Spec. V3.0
Access control
Cyclic polling master slave method, cyclic data
transfer by host (PLC, PC)
Error safeguard
Identification and repetition of faulty message
frames
Kap_06_en.book Seite 3 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011