Instruction manual

APPENDICES
APP − 24
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.
Start Method Setting Method Notes
Start by SVST instruction
Indirectly designate data in devices.
↓
Start by SVST.
Automatic start by cancel & start
Set data in the indirectly designated device
chosen by the start program.
↓
Turns the cancel command device ON.
Don't change the indirectly designated
device until the positioning start completion
signal of the start axis goes ON.
Designating loop (FOR to NEXT) point
data in the CPSTART instruction indirectly
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.
For details, see the positioning signal data
register "Monitoring data Area".