HEIDENHAIN PWM 20 - Manual (Page 223)

224 HEIDENHAIN ATS Software User's Manual
Incremental signals 1 Vpp device-dependent (“Incremental signals 1 Vpp” on page 212)
Some encoders also provide incremental signals. These are usually used to increase the
resolution of the position value, or to serve a second subsequent electronics unit. Current
generations of encoders have a high internal resolution, and therefore no longer need to provide
incremental signals. The order designation indicates whether an encoder outputs incremental
signals:
 EnDat 01 with 1 V
pp
incremental signals
 EnDat Hx with HTL incremental signals
 EnDat Tx with TTL incremental signals
 EnDat 21 without incremental signals
 EnDat 02 with 1 V
pp
incremental signals
 EnDat 22 without incremental signals
Notes on EnDat 01, 02:
The signal period is stored in the encoder memory.
Notes on EnDat Hx, Tx:
The encoder-internal subdivision of the incremental signal is indicated by the ordering
designation:
Ha, Ta:
2-fold interpolation
Hb, Tb: without interpolation
Hc:
scanning signals x 2
Power
supply The typical voltage supply of the encoders depends on the interface:
Exceptions are documented in the Specifications.
Connecting cables
EnDat 01
EnDat 21 5 V
 0.25 V
EnDat 02
EnDat 22 3.6 V to 5.25 V or 14 V
EnDat Hx 10 V to 30 V
EnDat Tx 4.75 V to 30 V
Shielded HEIDENHAIN cable
with incremental signals
without incremental signals PUR
[(4 x 0.14 mm
2 ) + 2(4 x 0.14 mm 2 ) + (4 x 0.5 mm 2 )]
[(4 x 0.14 mm
2
) + (4 x 0.34 mm
2
)]
Cable length Max. 150 m at 90 pF/m distributed capacitance
Propagation time Max. 10 ns; typ. 6 ns/m