Returning To The Previous Machining Program Before The External Search - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.36 External Search

14.36.4 Returning to the Previous Machining Program Before the External Search

The control returns to the previous machining program selected before the external search with the return method set in the
parameter. The control stores the machining program selected before the external search when executing the external
search.
When returning to the previous machining program, the control restores the modal information stored at the external search.
When the return is enabled by the parameter setting, and the externally searched program is finished in M99, the NC reset is
automatically executed.
Usage
Select the return method from the followings.
 Reset (reset 1, reset & rewind)
Note
(1) Not return by reset 2
 Program return signal
 Relation between the parameter settings and behaviors
ext24(bit2) = 1
Return by
reset
ext24(bit2) = 0
Since the return is enabled by reset when the parameter "#1288 ext24/bit2" is set to "1", it is possible to return to the previous
machining program before the external search automatically if the machine specification is to perform reset upon execution of
the program end M02 or M30 .Since the return is enabled by the program return signal when the parameter "#1288 ext24/bit3"
is set to "1", it is possible to return to the previous machining program before the external search with the switch or ladder.
 Usage example
Condition: Parameter "#1288 ext24/bit2" is set to "1" (Return is enabled by reset) and the program end of the externally
searched program is M99
Step
Program operation for workpiece machining
(1)
External search for pallet exchange program
(2)
Program operation for pallet exchange
(3)
Return to the program which was operated at (1) for
(4)
workpiece machining
Program operation for workpiece machining
(5)
Return by program return signal
ext24(bit3) = 1
Return by reset or program return signal
Return by program return signal
Details
ext24(bit3) = 0
Return by reset
Not return
Operation
Workpiece machining by pressing the CycleStart
button
Press the pallet exchange button
Pallet exchange for next workpiece by pressing
the CycleStart button
Unnecessary (Return to the program for work-
piece machining automatically)
Workpiece machining by pressing the CycleStart
button
871 IB-1501668-B