Reserved Pointers - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (1/2)
4 Explanation of Devices
4.4 Detailed Explanation of Devices

4.4.14.4 Reserved Pointers

Reserved pointers are pointers with fixed applications.
Single-program method
P4001 (high-speed): Start label for PLC high-speed processing program.
P4002 (medium-speed): Start label for PLC main (ladder) processing program.
P4003 (initialization): Start label for PLC initialization processing program.
P4005 (END): Label indicating END.
P4005 (END) can be used as a device for the CJ instruction, etc., but cannot be used as a label.
In addition, it cannot be used for a CALL instruction device.
X17
723
726
[Precautions]
(1) Do not omit the P4002 (medium-speed) label even when using only the PLC main processing program.
(2) Do not use P4001 (high-speed), P4002 (medium-speed), P4003 (initialization) or P4004 (system reservation) as a CJ
instruction or CALL instruction device.
(3) Do not program to jump to P** in the PLC high-speed processing program from the PLC main processing program.
(4) P** used as a CJ instruction or CALL instruction device must be programmed so that it is in the same program file as the
label instruction.
The PLC will not run properly if notes (1) through (4) are not observed.
Multi-program method
 Label indicating END (P4005)
P4005 is used as the CJ instruction jump destination. This cannot be used as a normal label.
It also cannot be used as the CALL instruction call destination.
If CJ P4005 is executed when multiple PLC programs are registered with the multi-programming function, the process will
jump to the end of all PLC programs (in other words, the scan process is canceled).
[To jump to end of all processes]
X17
Jump to END when X17
CJ P4005
turns ON.
Cancel process (jump to
CJ P4005
END of last program in
process) when X17 turns
ON.
53 IB-1501667-B