Connecting safety switches to AS-interfaces
April 2005
Enclosures, Cabling & Connectors
The SmartLine Safety at Work modules from IFM Electronic, enable connection of mechanical safety switches to AS-interface with no additional 24 V supply necessary. Evaluation to the Safety At Work protocol is carried out with one of the four available AS-i safety monitors.
The safe data transmission on the AS-i bus has already been approved by the TUV and BIA and is suitable for the transfer of signals up to the highest Category 4 to EN 954-1. Bright LEDs on the front panel indicate the switching states of the inputs and outputs, voltage supply and possible faults at the module. All kinds of mechanical safety switches with two forced contacts, and two independent switches with one contact each, can be connected to the two inputs.
Due to the integrated cross fault detection, the two contact signals can be run in one cable, as faults caused by damage to the cable sheath, shearing or crushing are detected and signalled.
The safe SmartLine slave carries out a permanent self-test after power up. This is transferred to the master as the safe state - triggered = code sequence '0000'. After power on and a successful function test, the Safety At Work protocol is started - not triggered = cyclical transmission of the code table. The two safe inputs are now ready for operation, and during operation the redundantly designed module is permanently monitored. The inputs are monitored for cross faults, and in case of a fault, a red error LED indicates the fault.
Combicon terminals ensure safe contact with the sensor and actuator cables. As an option, connectors with screw terminals, cage clamps or insulation displacement terminals are available. Addressing is carried out before or after mounting via the integrated addressing socket in the SmartLine module. The common addressing unit with an addressing cable with jack plug can be used. By using IFM's AS-i ControllerE family addressing is even easier, and its large graphic display gives the user an optimum overview. It is indispensable wherever distributed I/Os, modular design and high performance in gateways are important.
For more information contact Andrew Kerr, Shorrock Automation, 012 345 4449, [email protected], www.shorrock.co.za
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