Lenze 8400 StateLine - Manual (Page 266)

6 I/O terminals
6.1 Digital terminals
266
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
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6.1.1.2 Using DI1 and DI2 as frequency inputs
General information on using the input terminals as frequency inputs
The frequency inputs serve to detect HTL encoders with any number of increments and single-track
and two-track signals. Single-track signals can be evaluated with or without rotation signal.
Example of DI1/DI2 (in accordance wit the preceding note):
• Encoder increment: 512 pulses / motor revolution
• Reference speed (C00011): 1500 rpm
• Speed setpoint: 100 %
• Result: The speed or the number of increments is too high!

Tip!
From version 06.00.00 onwards , the LS_DigitalInput system block can also provide the
encoder position. Detailed information on this topic is provided in chapter " Output of the
encoder position of the DI1/DI2 frequency input ". ( 275)

Note!
• Make sure that, when motor control with speed feedback is in use, the maximum
input frequency of the respective input terminal is not exceeded.
• DI1/DI2: f
max
= 10 kHz
• If the encoder signal is used as an actual speed value:
Number of encoder pulses / revolution ≤ 8192!
Input frequency
1500 rpm
60 s
------------------------- 512 pulses × 12800 pulses/s 12.8 kHz
= = =