Prestop; Base Mode - WAGO -I/O-SYSTEM 750 Manual

2.1.1.9.6

Prestop

Prestop increases the positioning accuracy in both base and auto modes. Every
drive direction has its own prestop value. The direction-dependent value is
considered during the positioning process to determine the stop or deceleration
position.
If "Optimize_ON" = 1, the prestop is determined at every stop as a function of
the braking distance. When moving to a position while "Optimize_ON" = 1 in
the optimized auto mode, or with gearbox clearance compensation, the new
prestop value is written into the corresponding module's RAM registers and is
then available to the positioning interface as an updated value for the next
drive.
If "Optimize_ON" = 0, the prestop value is not written back, but the current
value of the corresponding RAM register is taken into account. In this
operating mode, the higher-level PLC can optimize values in the RAM
registers via parameter channel — depending on the application.
2.1.1.9.7

Base mode

For the following examples, it is presumed the acceleration distance and the
braking distance are equal.
Abbreviations used:
IP
SP
OT
AP
HP
Example 1:
PU = 0
PD = 0
RT = 0
OZ = 0
OT = 0
Fig. 2.1.1-7: Example 1
Zero (0) initializes the prestop. The motor turn-off position equals setpoint
position. The setpoint position is overtravelled by the braking distance.
WAGO-I/O-SYSTEM 750
I/O-Modules
Actual position BD
Setpoint position AD
Overtravel BM
Motor turn-off AM
position
Holding position OZ
AD
-
IP
750-636 [DC Drive Controller]
Function Description
Braking Distance RT
Acceleration Distance PU
Base mode PD
Auto mode D
Optimize V
AP = SP
Retry
Prestop Up
(RAM Register)
Prestop Down
(RAM Register)
Distance
Value
BD
+
HP
g063610x
• 27