Siemens IP-Module Manual Pagina 100

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Machine Data, Modes and Traversing Programs IP 266
Note:
If your drive system is not free from backlash, care must be taken that the drive
be adjusted by at least the value of the backlash, regardless of whether the
adjustment is made manually or via an external speed setpoint, as only then
can it be guaranteed that a positive mechanical coupling will be maintained
after the adjustment has been made.
"Stop" terminates the mode. The axis returns to the closed-loop state.
Mode 4 is also enabled on a response from the IP 266's encoder monitor. In this
case, a setpoint of 0 V is output. When you have rectified the error, stop mode 4.
The controller is reenabled, as is the position control monitor.
5.3.5 Set/Approach Reference Point (Mode 5)
Reference point
Mode
Start/Stop
Function
Set/Approach
Parameters
This mode is used to synchronize the IP 266's pulse counter with the drive system.
Synchronization of drive and pulse counter is necessary
to enable an approach to an absolute target position
to enable evaluation of the software limit switches
to invoke modes 6, 8, 9 and 10 and
because the reference point is lost following power-up
When this mode is invoked, the IP 266 assigns the coordinate value specified
under "reference coordinate" in the machine data to the axis position.
Note:
Zero offsets and tool offsets that were in force before the reference point was
assigned are not affected.
5-28
EWA 4NEB 812 6057-02
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