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Safety-rated rotary encoder with openSAFETY

29 April 2014

The CD75M safety rotary encoder delivers safe position and speed values in openSAFETY format and can be directly connected to POWERLINK networks.

The encoder, from TR-Electronic, is an example of how safe drives can respond to external movements at very high speed more easily and cost-efficiently. It is available with SIL 3/PLe certification and does not require external safety modules or any of their associated programming which results in  safe monitoring of movement axes without time-consuming hardware setup.

The encoder is able to determine safe values for position and speed by cross-checking redundant pairs of scanning sensors and processors. These values are then output via the openSAFETY protocol. During configuration, parameters such as the differential and standstill windows, direction of rotation or integration time are set up directly over the safe configuration channels of openSAFETY. 

Safe data can be bundled into openSAFETY packets and transferred over the same medium as the process data. The rotary encoder also provides preset electronic adjustment, which allows the current position value to be applied as the new actual value. 

The use of a single communication medium is said to make it easier for the user to access and implement all safe and non-safe data in the application. This simplifies and maximises diagnostics  and enables the use of innovative functions without requiring extra work. 

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