Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 189
8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
Encoder/feedback system
5.9.4 Encoder with HTL level at DI6/DI7
Low speeds with edge counting
The speed measurement is evaluated at the digital terminals DI6/DI7 with the edge-
counting procedure and a fixed scanning time that can be set in C00425/2
.
The minimum speed that can be measured and
the quantisation error of speed
measurement in the edge-counting procedure depend on the scanning time that can be
set in C00425/2
and the encoder resolution.
Set the scanning time in C00425/2
according to accuracy and dynamic requirements:
All values in [1/min]
Maximum speeds with edge counting
Due to the lower input frequency (max. 10 kHz) compared to the terminals DI1/DI2,
operation with maximum speed at the terminals DI6/DI7 is limited. Digital input
terminals ( 217)
Encoder
resolution
(Number of
increments)
Scan time [ms]
1 2 5 10 20 50 100 200 500 1000
8 1875 938 375 188 93.8 37.5 18.8 9.4 3.8 1.9
16 938 469 188 94 46.9 18.8 9.4 4.7 1.9 0.9
32 469 234 94 46.9 23.4 9.4 4.7 2.3 0.9 0.5
64 234 117 46.9 23.4 11.7 4.7 2.3 1.2 0.5 0.2
128 117 58.6 23.4 11.7 5.9 2.3 1.2 0.6 0.2 0.12
256 58.6 29.3 11.7 5.9 2.9 1.2 0.6 0.3 0.12 0.06
512 29.3 14.6 5.9 2.9 1.5 0.6 0.3 0.15 0.06 0.03
1024 14.6 7.3 2.9 1.5 0.7 0.3 0.15 0.07 0.03 0.01
Number of encoder increments
C00420/1
Maximum speed that can be measured [rpm]
8 No restrictions
16 37500
32 18750
64 9375
128 4688
256 2344
512 1172
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