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Rotary encoder

With shaft or hollow bore

Published 2018-01-03

Encoder Products Company (USA) supplies absolute encoders with CANopen interfaces. The CAN interface featuring automatic bit-rate detection uses an M12 connector.

The encoder products comply with the CiA 406 profile (Photo: Encoder Products Company)

The US-company offers encoders with 36-mm or 63,5-mm shafts as well as 36-mm or 58-mm hollow bore versions. All these products of the MA/SA series provide a CANopen interface following the CiA 406 specification. The encoders come by default with the node-ID 127h. The node-ID can be configured by a LSS (CiA 305) protocols or by means of SDO (not recommended by CiA). The red LED flashes when error frames occur and is permanently on, when the sensor is not ready or is bus-off. The green LED indicates the NMT state.

By default, TPDO 1 and TPDO 2 are enabled. They transmit the 32-bit position value on change-of-value respectively by reception of the SYNC message. Optionally, the user can map other values into the four pre-defined TPDOs, e.g. speed, acceleration, and jerk values. The encoders also provide cam functionality as defined in CiA 406. Alarms and warnings are supported, too.

The sensors feature some manufacturer-specific parameters such as speed scaling and frequency limit. Besides the node-ID, the bit-rate can be set by means of SDO services, which could be critical, if the restore default parameter functionality is used. Nearly, all competitors do the same.

With the 3D configuration tool the user can design its application-specific encoder (Photo: Encoder Products Company)

The company provides an online 3D configuration tool. After configuration, the user can download the drawing in almost any native format. Configuration-specific datasheets can be printed in PDF format. "Compared to other configurators, this 3D tool is much more functional and user-friendly than others I've used in the past," said Bruno Wilson, EPC Mechanical Engineer. "Engineers are going to love this tool."