Hiperface DSL: a digital encoder feedback interface with both SIL2 and SIL3 safety capability
01 June 2011
SICK (UK) has introduced Hiperface DSL, a fully digital encoder feedback interface with both SIL2 and SIL3 safety capability. The protocol carries comprehensive sensor data from motor to drive while reducing system costs, and is currently the only motor feedback interface with the capability of supporting encoders to SIL3 levels for both safe speed and safe position functions.
The interface is so robust that cores inside the motor power cable can be used for the communication of feedback data to the drive. The twisted pair traditionally used for the temperature winding sensor in a standard motor power cable can be utilised for the Hiperface DSL communication.
Encoders supporting Hiperface DSL will have an optional temperature sensor input for digitisation of the temperature signal and transmission to the drive together with encoder feedback data. The result is the dedicated feedback cable can be completely eliminated.
Hiperface DSL encoders will also contain life-time management functionality for preventative maintenance. Temperature, speed and rotation information will be logged inside the encoder with all information accessible via the interface. It will also allow the simple incorporation of additional sensor information to further enhance dynamic axis control, including torque, vibration and acceleration.
The protocol enables digital sensor data transmission over a maximum of 100m based on two or four wires integrated with the motor power cable.
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