
5.I/O SIGNALS B-64004EN/02
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5.5 NOTE ON MULTI PATH CONTROL
This section describes cautions about safe-related I/O signals that
should be taken in multi-path control.
5.5.1 Machine Group And Multi Path Control
CNC can treat servo axes and spindles by dividing into two classes of
groups, machine group and path
In case that a machine has plural machine parts that are controlled
independently, machine group is provided to control a part of machine
in such machine. Emergency stop is prepared for each machine group.
The signals for MCC off Test and protective door open/close sequence
are provided for each machine group.
In case that a work piece is machined by plural cutters and plural
programs at the same time, multi path control is applied. An alarm is
checked by each path. If servo alarm occurs in a path, MCC of all axes
in the path is shut off.
In case of the alarm by safety check function, MCC of all axes in the
path are shut off. Then the safety area should be set for each path
basically.
When plural safety areas are defined in a path, MCC may be shut off
by an alarm that occurs in another safety area.
When the safety area is composed by the axes that change assignment
to a path, MCC of other axes are not always shut off. So wire the
MCC of all paths, which include the axes changed assignment to the
path, to shut off at the same time.
The safety signals that are cross-checked are provided both on PMC
and DCS PMC for each path. The state must be controlled to be equal.