Schneider Electric Splitter Boxes Specifikace stáhnout pdf (Strana 4)

AS-i Bus

General Information

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Topology of the AS-i Bus

The topology of the AS-i bus is unrestricted. The lack of restrictions enables the most direct connections

to be made between the bus and the various sensors and actuators in an installation. The maximum

length of the AS-i bus is 328 feet (100 m) (including main runs and tap-off runs). Cable runs of up to 984

feet (300 m) are possible using repeaters (signal regenerators).

Connection of the AS-i cable is fast and is easily achieved by means of the IDCs (Insulation

Displacement Connectors) on splitter boxes, T-connectors, or tap-offs, which pierce the cable insulation

to make contact with the conductors. In the event of the IDCs being removed for circuit modifications,

the cable insulation self-seals.

Master/Slave Bus

AS-i is a master/slave bus: all the slaves are managed by a single master. The master polls each of the

slaves present on the bus, in turn, and waits for a reply. The cycle time is 5 ms maximum, for 31 digital

slaves. Communications are always initiated by the bus master.

AS-i slaves are manufactured and have a configuration at delivery with the address 0. Prior to

implementing for the first time, an address must be assigned to each slave using an addressing terminal.

The dialog between the master and the slaves is achieved using a modulated carrier current utilizing an

alternating pulse modulation (APM) technique. This is also known as Manchester coding. An error

detection procedure provides excellent integrity of data transmission.

Point-to-point Line

RingTree

Splitter box: connection base + splitter module T-Connector

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Schneider Electric Splitter Boxes Specifikace Strana 4