As-Interface: As-I slaves for safe and non-safe signal detection
June 2008
Enclosures, Cabling & Connectors
AS-Interface is a low-cost electromechanical connection system designed to operate over a two-wire cable carrying data and power over a distance of up to 100 m. It is especially suitable for lower levels of plant automation where simple field devices such as switches need to interoperate in a standalone local area automation network controlled by a PLC or PC. The new AS-interface slaves from ifm electronic allow easy connection of mechanical switching elements and LED components to the AS-system.
AS-Interface is tailored to the needs of devices such as sensors and actuators where low connection cost per node is critical and simplicity is paramount
A distinction is made between safe and non-safe AS-interface signal detection.
The safe AS-interface PCB serves for the connection of an e-stop mushroom pushbutton switch in compliance with IS0 13850 and EN 418 to the AS-interface bus system. In the safe version, two inputs (normally closed) and one output are available. Using the safe AS-interface slave, the highest category 4 to EN 954-1 is achieved.
In the non-safe version two variants are available for the user (2I/1O or 4I/4O). Up to four mechanical switching elements can be detected or light indicators triggered with power being supplied from the AS-system. The modules are all designed to be compatible with a variety of housings from various manufacturers.
Exact fault location can be determined through diagnosis of the indicator LEDs provided.
For more information contact Celia de Beer, ifm electronic SA, 086 143 6772, www.ifm.com
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