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FUJI AS-Interface_AS-i Slave Slaves
Slaves
An AS-i slave is basically the distributed I/O terminals (modules) of a programmable controller (PLC). The AS-i slave recognizes data bits (DO) transmitted from the master and returns its own data (DI) in response.
Most conventional I/O terminals have 16 or more inputs and outputs. This has caused extra I/Os, and resulted in many unused I/Os. The AS-i slave is advantageous as shown below because it distributes control with a small block of four I/O points per slave.
- Enables more efficient I/O use by eliminating extra inputs and outputs.
- Eliminates the need for many sensors of different cable lengths in distributed control because slaves are positioned close to the sensors. This ensures more efficient management of inventory and ordering.

Various AS-i slaves are available from a number of AS-i device manufacturers; such as motor starters, multi-layer indicator lamps, and operator panels as intelligent nodes, as well as digital, analog, and air valve slaves.
A variety of enclosure ratings, such as IP67 (waterproof, connector connection), IP40 (dustproof, connector connection), and IP20 (terminal connection), are available to fit operating conditions.

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