Specifications

IP 240 Positioning
c) DAV=2
After the outputs have been enabled, the IP output specified by setting control bit DA1S or
DA2S is set.
The output is reset when the reference point is reached.
Fig. 10-24. Switching of the IP Outputs during Reference Point Approach when DAV=2
Positive direction of travel Negative direction of travel
Control bit
HASY
Control bit
FREI
Z pulse
IN signal
Output
D2
Output
D1
Status bit
SYNC
Prior to transfer
of HASY=1
Reference
point
Reference
point
Backlash compensation during reference point approach (LOSE=1)
If you have configured the channel for backlash compensation, synchronization is possible in a
positive direction of travel only (ascending actual value). Decisive for evaluation of the direction is
the instant at which the preliminary contact signal is exited (negative edge of the IN signal).
If the preliminary contact signal was exited in a negative direction, the encoder's next zero mark
signal has the following effect:
• The actual value is reset
• Synchronization bit SYNC is not set
• The IP output is not reset
To reverse the direction, the drive must be stopped over the S5 CPU. To do this, transfer control bit
FREI=0 to the IP 240. The reference point approach must then be repeated.
Note
In order to ensure that synchronization is always carried out at the same place, the
direction of travel may not be changed following a negative edge of the prelimi-
nary contact signal.
EWA 4NEB 811 6120-02a 10-43