Encoders support SSI interface
A
Heidenhain (GB) product story
Edited by the Engineeringtalk editorial team
Nov 21, 2000
Absolute rotary encoders from Heidenhain can be used with subsequent electronics that support the unidirectional SSI interface.
Absolute rotary encoders from Heidenhain can be used with subsequent electronics that support the unidirectional SSI interface.
However, some plant manufacturers and users request universally applicable, programmable absolute rotary encoders where adjustment to specific measuring tasks on the host equipment can be made as well as to the respective higher-level electronics.
This has the advantage of reduced local encoder stocks because a single encoder version can be used for a variety of applications.
On programmable SSI rotary encoders, the singleturn resolution of 8,192 position values per revolution can be reduced by any whole number.
This scaling function permits the encoder to be adapted to measuring tasks specific to the equipment, for example, to adapt to various spindle pitches.
For continuous rotation on conveyor belts or for mechanical transmissions, the measuring range of the multi-turn version, with 4096 distinguishable revolutions, can be reduced by the appropriate whole number.
The preset value function sets the encoder to any desired position value as programmed by the user.
During the cutting or printing of materials such as textiles or paper, the measured value can be reset by means of preset values activated by optical length markers to reflect the actual distension of the material before the next working step.
It is also possible to set the zero value at any position by an offset value, or to reverse the counting direction.
The selectability of the Gray or pure binary code and the 'tree' or right-justified transmission format also makes it possible to adapt the Heidenhain encoder to a wide range of different types of subsequent electronics.
The programmable absolute rotary encoder also offers a diagnostic function that provides information on the operating status through alarms and warnings.
A fault signal on a dedicated line can be evaluated in the PLC.
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