24 Volt ASi

Content

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 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 with a maximum cable length of 50 meters.

To top

24 Volt ASi Gateways

24 Volt ASi overview

Ideal for small and very small applications
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

To top

Maximum Cable Length

24 Volt ASi Gateway with 24 V standard power supply

24 Volt ASi Gateway 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.

To top