24 Volt ASi

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What is AS-Interface?
24 Volt ASi Gateways
Maximum Cable Length
Ideal for a Handful of Slaves
Save with 24 Volt ASi

What is AS-Interface?

AS-Interface is a globally standardized fieldbus system (EN 50295 and IEC 62026-2). It is a system that links sensors and actuators to a controller over a common data transmission path.

Data and power through a single cable

The abbreviation ASi stands for Actuator-Sensor Interface. This interface connects the modules in the lowest process level in automation systems with each other. The usual cable trees are replaced here by a single electrical cable – the ASi cable. This cable carries both data and power.

The four ASi components

Leading manufacturers around the world support this simple wiring system. It consists of four components: the master , the slaves , a power supply and the yellow ASi cable . Each slave has a unique address assigned to it which the master used to exchange in- and output data.

Power for ASi

ASi modules are generally powered by an additional power supply having a rating of 30 volts.

Small systems can eliminate the power supply

Bihl+Wiedemann now offers masters which can be connected to already present standard 24 V power supplies, without the need for an additional ASi power supply. This is an ideal solution for small machines having three to 15 slaves and a maximum cable length of 50 meters.

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24 Volt ASi Gateways

24 Volt ASi overview

Ideal for small and very small applications (around 3-15 slaves)
No additional ASi power supply needed
Can be powered directly by the 24 V already present in the control cabinet
Maximum 4 A available for ASi
Up to 50 m ASi cable length
Interfaces with all common fieldbus systems

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Maximum Cable Length

ASi with 24 V standard power supply

ASi with 30 V power supply

V = R × I
Voltage = Resistance × Current

The longer the ASi cable, the greater the resistance. This means for 24 Volt ASi that a cable length of 50 meters should not be exceeded, since otherwise the voltage drops too low.

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