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FUJI AS-Interface_What is AS-i?
Features
Flexible wiring method
• AS-i enables highly flexible wiring. Three kinds ofnetwork topology, tree, line, and star, are available.
Conventional wiring and cable quantities can be greatlyreduced.
No terminating resistors are required.



High-speed response
• The data transmission time (cycle time) is approx. 5ms.when connecting 31 slaves, 10ms when connecting 62 slaves.
• Self diagnosis is performed simultaneously on slaveconfiguration information.




Reduced installation and wiring time
• A single AS-i cable (2-core) can send data and supply power. Waterproof-type slaves and AS-i cables can be easily connected by tightening a screw on the actual slave, using piercing technology.
• The asymmetrical cross-section of the AS-i cable facilitates polarity confirmation and prevents connection error.
• After a slave is removed, the pin holes are blocked by the elasticity of the cable to recover insulation.




Superior communications
• The standard transmission distance of 100m can be extended to up to 300m using repeaters.
• AS-i features a rapid cycle time of approx. 5ms when connecting 31 standard slaves, and 5ms when connecting 62 A/B slaves.
• In AS-i system of version 2.1, up to 434 I/O signals (62 slaves) for sensors and actuators can be sent on 2-core serial wiring.
• In protected mode, the address of a failed slave is indicated on a master (except NB6). After the slave is replaced, the automatic addressing function automatically assigns the original address to the new slave (when replacing only one slave).




Superior environmental resistance
• Slaves now have outstanding environmental resistance (IP65, 67). This reduces the number of relay boxes required and contributes to downsizing.




Excellent noise immunity
• Transmission signals employing a sin2 waveform have superior noise immunity.

In AS-i, data signals are first encoded in Manchester II code, and are then sent out on AS-i cable in sin2 waveform using alternating pulse modulation (APM). APM has the following advantages.
• Emission
As the sin2 waveform has a narrow spectrum bandwidth, noise radiated from AS-i cables does not affect other devices
• Immunity
As APM has good regularity and redundancy, very effective error detection is possible to ensure highly reliable data.

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