AS-Interface contact blocks

Indstead of up to 10 cable lines per pushbutton or switch, AS-Interface requires only twpo wires which are connected by insulation piecing (IDC technology) and looped through to all the assigned slaves. Up to 62 pushbuttons and switches can be connected to one 2-conductor cable. This saves work, cuts installation times, reduces the number of potential errors and, in case of need, can easily be changed or extended.

Due to the flexible AS-Interface network structure, the SCHLEGEL slaves can be connected to any position. Each control and signalling device means a separate node with individual address in the AS-Interface system.

Product configurator

Slave characteristics

Certified AS-Interface slave with two input functions and one dimmable output to accept a pluggable LED with T5,5K socket

Output with short-circuit and overload protection

Up to max. 62 slaves can be connected to one single AS-Interface cable

Input data ports D2 and D3

The LED can be dimmed in 4 steps while toggling between two brightness levels is possible via the outputs D0 and D1

Same size as the standard contact blocks of the "A...“ type series - Failure-safe operation even under extreme environmental conditions (e.g. welding plants, frequency converters)

Combination with 2- and 3-position selector and key switches is possible

AS-Interface profile S-B.A.E (extended address mode)

Output data ports D0 and D1

Easy connection via 2-pole IDC connector

Blockschaltbild

In this picture you can see a block diagram of an AS-Interface.

Data bits of the outputs and inputs

General

Pushbutton head

In this picture you can see the switch positions of an AS-Interface.

Selector/key switch,
with 2 positions (one-piece plunger)

In this picture you can see an AS-Interface with two positions.

Selector/key switch,
with 3 positions (2-piece plunger)

In this picture you can see an AS-Interface with three positions.

Note

For the use of 2-position selector and key switches with 2 plungers: As the switch head and ASI slave can be snapped together turned by 90°, the following basic positions must be observed for a clear assignment of the input bits (DI2, DI3):

ASI slave connections upward

Locating lug upward

LED brightness control

For the brightness control of the LED (4-step dimming) the pulse-duty factor of the pulse-width modulated voltage (PWM) can be adjusted by a parameter request of the master. The output current is reduced in four steps (individually for each output D0/D1), namely from 100% to 50%, 25% or 12.5% of the continuous current.

Due to the individual LED control via the outputs D0 or D1, it is possible to toggle between two different brightness levels. This is achieved via the "Write Parameter Call".

On this picture you can see parameters of an AS-Interface.

Norms and standards

AS-Interface, the standard of the lower field level, complies with the European norm EN 50295 and the worl standard IEC 62026-2.

Certification and AS-Interface Logo: The reliable function and failure immunity of the SCHLEGEL slaves were tested by an authorised laboratory. All certified products are bearing the AS-Interface Certification Logo.

AS-Interface specification, version 2.11, revision 1

CSA

Connection of slaves

The slaves are connected (by insulation piercing) to the flexible equipment wire via a 2-pole, reverse polarity protected connector (3.96 mm) with lock mechanism and strain relief.

Cable requirements

The connecting cable must meet the following requirements:

Colour coding: brown: ASI+ / blue: ASI-

Insulation: medium hard PVC insulation, suitable for insulation piercing (IDC technology)

Single conductor size: AWG 18 (0.8...1.0 mm²)

Outer diameter: min 1.0, max. 2.28 mm

Operating temperature: -30°C <= T <= 90°C

Approvals: VDE 0881 / MIL-W-1687 8D / UL 1007 or 1061 or 1095

Connection to AS-Interface profile cable

Depending on the case of application, there are different possibilities to connect a double-core flexible wire (AWG18) to the AS-Interface profile cable.

Addressing of slaves

Each AS-Interface slave gets an individual address allowing the master to identify it. Possible addresses are from 1A to 31A and 1B to 31B (A/B slaves, version 2.1). The address 0 has a special function. Depending on the technology that is used, addressing of the slaves is done either before or after the assembly.

Addressing possibilities

The slaves are connected (by insulation piercing) to the flexible equipment wire via a 2-pole, reverse polarity protected connector (3.96 mm) with lock mechanism and strain relief.

Addressing cable + addressing device: The easiest way to assign the addresses is to use a hand-held addressing device which is directly connected to the slave via the SCHLEGEL addressing cable "ASI_PK500M12". The arrangement of the devices at the AS-Interface cable is independent from the assignment of the addresses.

Addressing with AS-Interface controller / PLC Various producers of controllers/PLC support the following addressing possibilities :

• Automatic addressing of the complete system
• Individual addressing via the connected master
• Individual addressing via PC with implemented software

Notes

Avoid double addressing!

A/B slaves (V2.1) cannot utilise the 4th output data bit because it is used to change over to the B slaves.

A/B can be operated with AS-Interface 2.0 masters, provided the following is strictly observed:
• Only "A" addresses are used
• The 4th data bit must permanently be "0"
• The 4th parameter bit must be "1"