With this encoder/interface combination, machine and plant manufacturers can now have all the benefits of serial data transfer, such as optimization of costs, diagnostic possibilities, automatic commissioning, and rapid formation of the position value in safety-related applications.

Specifically, HEIDENHAIN’s subsystems for a safe drive consist of: Encoder with EnDat 2.2 transmission component Data transfer line with EnDat 2.2 communication and HEIDENHAIN cable EnDat 2.2 receiver component with monitoring function (EnDat master)

Now safety-related systems can be designed with only one encoder per axis provided that the encoder complies with stringent requirements for reliability of the transmitted position. The EnDat 2.2 has a maximum transmission frequency of 16 MHz, making it the fastest serial interface for position encoders on the market today for RS-485 technology.

The reliable transmission of the position is based on two position values generated independently from each other and on error bits. Online diagnostics is a unique feature of the EnDat interface. The values are then all provided to the safe control.

HEIDENHAIN encoders for safety-related applications are inspected for compliance with ISO 13 849-1 (which replaces EN 954-1) and IEC 61 508. These standards describe the assessment of safety-related systems, for example, based on failure probabilities of integrated components and subsystems.

HEIDENHAIN’s first pre-qualified safety-related position encoders available are the ExN 425/437 series and ExN 1325/1337 series rotary encoders for electrical drives. In the future, this technology will also be used in absolute linear and angle encoders with EnDat 2.2.

More information on safety-related position encoders is available by contacting HEIDENHAIN at:

HEIDENHAIN CORPORATION
333 E. State Parkway
Schaumburg, IL 60173

Tel: (847) 490-1191

E-mail: [email protected]
Web: www.heidenhain.com