IM01_Industrial communications
Only one cable instead of hundreds!
Conventional wiring AS-Interface
AS-I is a system which transforms the conventional wiring of sensors and actuators in a net.
This net has a tree structure and the relations between elements are master-slave relations.
TO KNOW MORE
If you want to learn more, you can check the following webpage with information about this: http://www.automation.siemens.com/mcms/industrial-controls/en/industrialcommunication/as-interface/as-interface/Pages/default.aspx?tabcardname=Products&stc=wwiia305937

Standard AS-Interface according to EN 50295

Master-slave method (deterministic) access

Maximum cycle time 5/10 ms (31/62 slaves)

Transmission medium 2-wire cable without screen and with polarity reversal protection. Data and power over the same cable

Maximum number of slaves 62 slaves (max. 248 bits E, S 186 62 bit slaves)

Maximum Extension 300 m grid network (repeater / extender)

Topology Line, Tree, Star

According to AS-Interface Protocol

Communication Application process-level or field

Association of a large open number of manufacturers and users
IM01-Industrial communications / Unit 3 1

Cable profiling => Protection against reverse polarity
Cable special equipment => Self healing
Resistant variants against hostile materials: PUR (Polyurethane): Resistant against greasing materials TPE (thermoplastic elastomer): Resistant to gasoline or diesel
Deliverable Color: Yellow Details and Power - 30V
DC
Black Power supply 24V DC AS-i slave for use with the base modules FK-E. This wire is only necessary for output slaves
The red wire transport the positive connection
The blue wire transport the negative connection
100 m repeater to extend cable AS-i (max. 300 m)
Extender to increase the distance between a master (max. 100 m) and an AS-I segment
P.S . AS-i
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2
L1
3 4 5 6
N
Schirm
ASI
+
ASI
-
Max. 100m per segment
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
Schirm ASI
ASI
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
Schirm
ASI
ASI
SIEMENS
POWER SUPPLY
ASI ASI +
Schi rm
Schirm
ASI ASI
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1
L1
2 3 4 5 6
N
Schirm
ASI
+
ASI
-
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
Schirm
L1
ASI
ASI
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2
L1
3 4 5 6
N
Schirm
ASI
+
ASI
-
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
L1
Schirm ASI
ASI
Repeater
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
Schirm
ASI
ASI
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2 3 4 5 6
L1
N
Schirm
ASI
+
ASI
-
Repeater
Max. 100m per segment
P.S . AS-i
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2
L1
3 4 5 6
N
Schirm
ASI
+
ASI
-
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
L1
Schirm ASI
ASI
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
Schirm ASI
ASI
Repeater
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2 3 4 5 6
L1
N
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
Schirm ASI
ASI
Schirm
ASI
+
ASI
-
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
Schirm
L1
ASI
ASI
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
L1
Schirm ASI
ASI
Repeater
Repeater
POWER SUPPLY SIEMENS
ASI ASI +
Schi rm
Schirm
ASI ASI
Repeater
SIEMENS
POWER SUPPLY
ASI +
ASI -
Schi rm
1 2 3 4 5 6
L1
N
Schirm
ASI
+
ASI
-
SIEMENS
POWER SUPPLY ASI +
Schi rm ASI -
L1
Schirm
ASI
ASI
IM01-Industrial communications / Unit 3 2

The AS-I net needs the connections of a special power supply to the net. It has to give the adequate voltage of 24 to 30 V, but it also has to let the impulses of communications. Data and power are over the same cable.
IP20 AS-i 2,4A
IP20 AS-i 7A
Combi-NT IP20
AS-i 3,5A
+ 24V DC 4,5A
Dual-NT IP20
2x AS-i 3,5A
IP65 AS-i 2,4A
CP 242-2 per S7-200, until 2 CPs connecting for S7-200
CP 242-8 per S7-200
Master AS-i & slave DP in the same device
DP/AS-i Link 20
CP 142-2 per ET 200 X
Protecting IP65: until 6 Masters for device ET 200 X
Video about Industrial communications AS-i
IM01-Industrial communications / Unit 3 3

Devices of signal and commander
Decentralized Motor drivers
Optical barrier K80
Sensors of proximity BERO
In version 2.0 we can connect 31 slaves occupying the address 1 to 31. Leave As-I always reserved the address 0.
In version 2.1, it is extended to 61 slaves, and into the possibility of connecting analogical slaves.
Each slave must be programmed to take a certain direction, which can not be occupied by another slave. We need a programmer of
AS-I slaves, as shown in figure. This device also lets us test different characteristics in AS-I net as the voltage.
IM01-Industrial communications / Unit 3 4

An ASI module MASTER per S7200 occupies in memory from: AIW0, AQW0, IW2, QW2
Buttons:
SET: Detects connected slaves
Display: Displays the configuration
SLAVE ADRESSES
Buttons SET and Display
(under the tape)
Code: The first three columns indicate leds.
Other LEDs: Indicate where rows are configured slaves.
Green LED flashing: Slave address previously detected which is no longer present. Reconfigure with SET button.
Yellow LED SF CM: See code. It generally indicates the presence of a slave no configured
Red LED: Fault System
Example:
The first three LEDs indicate the presence of slaves in the column marked with code 001.
The LEDs indicate there row slave addresses 1, 2, 3.
With the DISPLAY button accessing we will code the columns 010, 011, to 111. At each code column we have six different directions. If a slave is one of them, we will appear on your LED row
IM01-Industrial communications / Unit 3 5

The picture shows a configuration with the following elements:

Master AS-I over PLC S7200

Power supply

Logo Slave (4 inputs and 4 outputs)

Slave (2 inputs and 2 outputs). In the two inputs two proximity sensors are connected. In the two outputs, a contactor with a motor and a LED are connected.
Output Slave 1
Power supply
AS-i wire
Slave 2
LOGO
Inputs Slave 1
Slave 1
PLC
Master AS-i
Each of the slaves connected to a master has 4 bits reserved in memory of inputs and 4 bits reserved in memory of outputs. In the former configuration we have:
SLAVE 0
(Reserved)
SLAVE 1
(Module 2I/O)
SLAVE 2 (Logo) SLAVE 3
X X IN2 IN1 Qa4 Qa3 Qa2 Qa1
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
OUT4 OUT3 X X Ia4 Ia3 Ia2 Ia1
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
The first memory position (inputs) is occupied in AIW0
The second memory position (outputs) is occupied in AQW0
IM01-Industrial communications / Unit 3 6

HIGHLIGHTS

AS-I lets us connect actuators and sensors in a net.

The relations between the elements are always Master-Slave.

PLC is the master, normally an additional module for a CPU.

We have a wide catalogue of slaves.

Each slave has to be programmed to work in an address: 1 to 62.

Each slave can connect a maximum of 4 inputs and 4 outputs.

AS-I net needs a special power supply. AS-I bus transports date and power.

Slaves which have outputs need another power supply to connect them. This power supply can be a standard one.
IM01-Industrial communications / Unit 3 7