Fagor CNC 8060, Installation Manual, Page: 432 / 698

Installation manual.
CNC 8060
CNC 8065
6.
LOGIC
CN
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When the type of feedback is iexternal, the CNC uses the internal feedback (motor
feedback) on power-up, when resetting the drive and when initializing the Sercos ring.
The ACTFBACK(axis) mark indicates which is the active feedback. See "ACTFBACK(axis)"
on page 405.
DEAD(axis)
When the system has a dead axis, the transition between blocks (blending) where the dead
axis is involved, it issues the "axis locked up" error message. This is due to the delay between
the activation of the ENABLE and SERVOON signals .
To avoid this error, the PLC offers this mark that indicates how the CNC must handle the
transitions between blocks when a dead axis is involved.
• If the PLC sets this mark high (=1) whenever the axis is involved in the movement, the
CNC does not apply the transition (blend) between blocks; in other words, the
movements where the dead axis is involved, they wait a time period set in the DWELL
parameter.
• If the PLC sets this mark low (=0), the CNC blends the blocks even when the axis is
involved in the movement.
This mark must be set high (=1) when the axis is enabled as dead axis and low (=0) when
it is enabled as a live axis.
SWITCH(axis)
When the system has multi-axis groups, this mark may be used to toggle between the various
axes or spindles of the group. The PLC activates this mark to let the CNC know which axis
or spindle of the group is active. If the PLC turns this mark off, the CNC assumes that the
axis or spindle does not belong to the current configuration.
TANDEMOFF(axis)
This mark may be used to temporarily decouple (unslave) the loop of the axes or spindles
involved in the tandem so they can be move separately. For example, in a C axis tandem,
there is no need to engage each motor which requires generating an oscillation movement
on each motor without affecting the other.
This mark refers to the slave axis or spindle of the tandem. If the PLC activates this mark,
the slave axis is decoupled from the master and both axes may be moved separately. The
slave axis can only be moved from the PLC through the PLCOFFSET. The master axis may
be moved as usual from the jog panel, from the MDI/MDA mode, etc. When moving the
master axis, the CNC will not generate a velocity command for the slave axis nor will apply
any compensation.
Even if the tandem is decoupled, it will remain active in terms of programming, display, etc.
The CNC displays the coordinates of the master axis, does not allow programming the slave
axis and none of the axes may be parked. The CNC can home the master axis and at the
end of the home search, the CNC will also initialize the position value of the slave axis (with
the position value of the master).