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3 MOTION DEDICATED PLC INSTRUCTION
Moving Backward during Positioning
When a speed change is made to a negative speed by the CHGV instruction, the travel
direction can be changed to the direction opposite to the intended positioning direction.
Operation for each instruction is as follows.
G-code Instruction Operation
G00
G28 (High-speed home position return)
G30
G53
G02
G03
The axis is reversed in travel direction, returns to the positioning start
point at the specified speed, and stops (stands by) there.
G01
G32
The axis is reversed in travel direction, returns to the preceding point at
the specified speed, and stops (waits) there.
G25 Minor error (Error code : 310)
(Note)
occurs.
G28 (Proximity dog, count, data set, dog
cradle, stopper and limit switch combined type
home position return)
Speed change cannot be
made.
Minor error (Error code : 301)
(Note)
occurs.
JOG operation
Speed change to negative
speed is not made.
Speed is controlled at speed
limit value.
Minor error (Error code : 305)
(Note)
occurs.
(Note) : Minor error (Error code : 301) : Speed change was made during home position return.
Minor error (Error code : 305) : Preset speed is outside the range of 0 to speed limit value.
Minor error (Error code : 310) : Speed change was made during high-speed oscillation.
[Description]
(1) When a speed change is made to negative speed, speed is controlled as listed
above according to the G-code in execution.
(2) The backing command speed is the absolute value of the new speed. If it exceeds
the speed limit value, a minor error (Error code : 305) occurs and the speed is
controlled at the speed limit value.