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Redundant absolute encoder with CANopen interface

TR-Electronic (Germany) introduced the CR_582 CANopen solution with two encoders in the space for one 58‑mm industrial encoder. Here, the safety concept is realized using the redundancy principle.

(Source: TR-Electronic)

Two single and multi-turn detecting encoders work inside the device independently from each other. Actual measured values are transferred to two separately operating CAN controllers. The two systems only share the shaft (solid or blind shaft) and the connection technology to the CANopen network. The device is represented on the CANopen network as two nodes (two node‑IDs). The node‑ID of the first CANopen controller is set with the hardware switches on the encoder. The second controller's node‑ID has a fixed offset to the first one. The gear factors of each encoder can be parameterized independently. Rational gear factors are available. Rotating axes can be scanned without rounding errors. The two encoder systems can also be referenced (set to zero) differently.

The position within one revolution is resolved with 13 bits. In the standard configuration 4096 revolutions are detected absolutely. The scanning technology is designed with different techniques. This reduces the likelihood that an error influence will cause a failure in both systems at the same time. The characteristic value for CCF (common cause failure) determined during the analysis is 80 and thus exceeds the requirements for avoiding failures due to a common cause. The user can adopt the characteristic value for their design of safety functions.

The company manufactures rotary encoders, linear encoders, drives, components, and industrial PCs. Standard products and individual solutions for customer’s requirements are offered.


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