For angle measurement, HEIDENHAIN provides a large selection of encoders that covers the entire range of accuracy requirements.
Angle encoders
The term angle encoder is typically used to describe encoders that have an accuracy of better than ± 5" and a line count above 10000.
These devices are used in applications such as NC rotary tables, swivel heads of machine tools, dividing apparatuses, high-precision angle measuing tables, precision devices in angular metrology, antennas and telescopes.
Rotary encoders
Rotary encoders from HEIDENHAIN serve as measuring sensors for rotary motion, angular velocity and also, when used in conjunction with mechanical measuring standards such as lead screws, for linear motion. Application areas include electrical motors, machine tools, printing machines, woodworking machines, textile machines, robots and handling devices, as well as various types of measuring, testing, and inspection devices.
With incremental angle encoders and rotary encoders, the current position is determined by starting at a datum and counting measuring steps, or by subdividing and counting signal periods. Incremental encoders from HEIDENHAIN feature reference marks, which must be scanned after switch-on to reestablish the datum. Incremental rotary encoders with commutation signals supply the angular shaft position value - without requiring previous traverse - with sufficient accuracy to correctly control the phases of the rotating field of a permanent-magnet three-phase motor.
Absolute angle encoders and rotary encoders require no previous traverse to provide the current position value. Singleturn encoders provide the current angular position value within one revolution, while multiturn encoders can distinguish between revolutions. Absolute angle encoders and rotary encoders from HEIDENHAIN provide the position values over an EnDat, SSI, profibus-dp, or other serial data interface. The EnDat profibus-dp bidirectional interfaces enable automatic configuration of the higher-level electronics and provide moitoring and diagnostic functions. With programmable rotary encoders, the user can adjust various encoder functions and parameters from a PC with provided software.
Magnetic Modular Encoders
The robust ERM magnetic modular encoders are especially suited for use in production machines. Their large possible inside diameters as well as the small dimensions and compact design of the scanning head predestine them for:
• The C axis of lathes
• Spindle orientation on milling machines
• Auxiliary axes
• Integration in gear stages

![HEIDENHAIN ERN 130 [ExN 100]](images/encoderimages/ern-130-exn-100_small.jpg)
![HEIDENHAIN ECN 1325 [ExN 1300]](images/encoderimages/ecn-1325-exn-1300_small.jpg)
![HEIDENHAIN ECN 1113 [ExN 1100]](images/encoderimages/ecn-1113-exn-1100_small.jpg)
![HEIDENHAIN ECN 1023 [ExN 1000]](images/encoderimages/ecn-1023-exn-1000_small.jpg)
![HEIDENHAIN ROD 420 [ROx 400]](images/encoderimages/rod-420-rox-400_small.jpg)
![HEIDENHAIN EQN 437 [ExN 400]](images/encoderimages/eqn-437-exn-400_small.jpg)
![HEIDENHAIN EQN 425 [ExN 400]](images/encoderimages/eqn-425-exn-400_small.jpg)
![HEIDENHAIN ECN 1319 [ExN 1300]](images/encoderimages/ecn-1319-exn-1300_small.jpg)
![HEIDENHAIN ECN 1313 [ExN 1300]](images/encoderimages/ecn-1313-exn-1300_small.jpg)
![HEIDENHAIN ECN 1123 [ExN 1100]](images/encoderimages/ecn-1123-exn-1100_small.jpg)
![HEIDENHAIN ROC 425 [ROx 400]](images/encoderimages/roc-425-rox-400_small.jpg)
![HEIDENHAIN ROC 1013 [ROx 1000]](images/encoderimages/roc-1013-rox-1000_small.jpg)




