Mitsubishi Electric A173UHCPU Programming Manual page 375

APPENDICES
Start method
Start by SVST instruction
Automatic start by cancel & start
Designating loop (FOR - NEXT) point data in the
CPSTART instruction indirectly
POINT
Be sure to designate even-numbered devices for 2-word designation items.
Be sure to use the DMOV(P) instruction when setting data in these devices by
sequence programs.
(2) Device data fetch
Data for indirectly designated devices is fetched by the PCPU at the start of the
servo program.
For this reason, set data in the devices before starting the servo program, and
never change the devices unless servo program start is complete.
The following describes the procedures by start method for setting data in
devices and the points to note.
Designate data in devices.
Set data in the indirectly designated device chosen
by the start program.
Turns the cancel command device ON.
Designate initial command data in the indirectly
designated device.
Start by SVST (or set the cancel command device
to ON).
Read the value of constant speed control data set
pointer of the started axis, and update the data
fetched by PCPU.
Setting method
↓
Start by SVST.
↓
↓
↓
APP − 58
Notes
Don't change the indirectly designated device
until the positioning start completion signal of the
start axis goes ON.
For details, see the positioning signal data
register "Monitoring data Area".