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AS-i Bus

General Information

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AS-i Slaves

An AS-i bus may be used with up to 31 slaves (each incorporating an ASIC) each consisting of 4 Input

bits and 4 Output bits for cyclical exchange of information with the master, plus 4 parameter bits allowing

extended functions (configuration, diagnostics, etc.). Each slave has its own address and a profile

(defining the exchange of variables). Intelligent sensors and actuators (incorporating an ASIC) can be

connected directly to the AS-i bus via passive splitter boxes or T-connectors.

Standard (non-intelligent) digital sensors or actuators are connected to the bus via intelligent splitter

boxes or cabling interfaces. The maximum number of standard units that may be connected is 248.

Many applications involve a mixture of both intelligent and standard (non-intelligent) sensors/actuators.

1 Passive T-connector 3 Intelligent splitter box

2 Passive splitter box 4 Cabling interface

Each device connected on the AS-i bus is supplied via the AS-i cable from a special power supply

unit (PSU).

The rating of this PSU must be suitable for the total consumption of the devices on the bus. The PSU

may be located at any point of the bus.

Protocol Centralized master/slave

Dialog Type Cyclical polling

Refresh Time 5 ms for 31 slaves

Response Time Max. time defined for each slave

Connection Points 31 slaves

Number of Standard Products 248 maximum

Data 4 status bits, 4 command bits, and 4 parameter bits per slave

Maximum Length of Bus 328 ft (100 m), 984 ft (300 m) with repeater

Network Characteristics Supply and signal on the same cable

Physical Layer 2-core unscreened cable

“Actuator-Sensors Interface AS-i Bus” document XDOC5011EN contains basic information on the AS-i

bus for electricians, automation engineers, and specifiers. This document explains the AS-i concept,

recommendations for initial installation, and set-up.

AS-i Bus

31 Intelligent Components (Sensors or Actuators)

Basic Functions + Extended Functions

248 Standard Components, Maximum

Basic Functions

1 2 3 4 5 6 7 8 9 10 11 ... 67 68

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