Lenze E94A - Manual (Page 350)

5 Function blocks
5.94 L_LdPosCtrlLin - Master value adjustment via position
350
Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.94.2.2 Time-based compensation of mark correction
In many production processes, a print register is already defined on the web, e.g. via print marks.
These mark signals can be detected with high precision via fast digital inputs (touch probe inputs)
in the controller:
[5-55] Example : Material path with register
Since the production process is periodical, a print mark pulse appears per cycle. Ideally, the pulse al-
ways appears at a certain set position x
TP
in the master cycle 0 ... x
max
. If the print mark pulse is de-
tected at another position than at its set position x
TP
, there is a deviation Δx
TP
between setpoint and
actual position of the print mark pulse.
 Slave drive
 Print-mark sensor
 Web
 Master value encoder
X
max
= x-cycle of the register