Digital interface offers faster motor feedback
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Danaher Motion product story
Edited by the Engineeringtalk editorial team
Dec 22, 2004
Danaher Motion drives and servomotors now support a new high speed digital interface for motor feedback.
Danaher Motion drives and servomotors now support a new high speed digital interface for motor feedback.
This open technology has been developed to meet the demands of increasingly popular "smart encoders", it is bidirectional and has an asynchronous mode especially for writing to and from configuration registers.
BiSS is high speed interface capable of 10Mbit/s datarates during operation in synchronous mode, resulting in short cycle times for the most demanding control applications.
Supporting up to eight slaves from a single master, the interface provides an asynchronous mode specifically for the configuration of smart nodes.
The high speed of the network means that the interface could be made fully digital, so that it can be used for absolute encoders and enabling the use of CRC codes for error checking.
This makes BiSS a more functional and reliable alternative to the widespread ABZ interface.
The physical layer uses an industry standard RS485 differential interface, making it immune to noise.
The BiSS interface is truly open - not only are BiSS master, sensor, interpolator and ASIC integrated circuits available, but the VHDL code for the interface components can be downloaded from the internet.
The BiSS interface is available under a GPL licence, more familiar in the Linux community than industrial automation.
Developed by Danaher Industrial Controls - itself a sister company of Danaher Motion, BiSS is supported by Kollmorgen S300, S400 and S600 servo drives, AKM, DBL and DBK series motors and Hengstler Acuro rotary encoders.
The technology is increasingly popular, adopted by TR-Electronic, Steinbeis Transferzentrum Automatisierung (STA), with integrated circuits available from IC-Haus.
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