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AS-Interface (AS-i)

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SIMATIC NET AS-Interface – Introduction and Basic Information

C79000-G8976-C089/03

1.1 Area of Application

AS-i Cable Replaces “Cable Harnesses”

The Actuator/Sensor Interface or AS-Interface, normally abbreviated to AS-i, is a

connection system for the lowest process level in automation systems. The cable

harnesses previously found at this level are replaced by a single electrical cable,

the AS-i cable. Using the AS-i cable and the AS-i master, the simplest binary

sensors and actuators can be connected to the control devices at the field level via

AS-i modules.

AS-Interface in SIMATIC

AS-Interface is the SIMATIC product name for the AS-i technology.

Under the name AS-interface, Siemens produces master interface modules for

industrial PCs and programmable controllers. The range of available master

interface modules is being permanently extended. Up-to-date information can be

obtained from your local Siemens office.

The following diagram illustrates the position of AS-i within the automation system.

Cell level

Field level

Industrial Ethernet

PROFIBUS

Process

level

AS-Interface

Management level

Figure 1-1

The AS-interface is distinguished by several main characteristics:

S AS-interface is optimized for connecting binary sensors and actuators. The AS-i

cable is used both for data exchange between the sensors/actuators (AS-i

slaves) and the AS-i master as well as for power supply to the sensors /

actuators.

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