7.9 1-Axis Fixed-Pitch Feed Control - Mitsubishi Electric A173UHCPU Programming Manual

7. POSITIONING CONTROL

7.9 1-Axis Fixed-Pitch Feed Control

Servo Positioning
Instruction Method
FEED-1
Incremental
[Control Details]
Positioing direction
Current stop position
Reverse
direction
Travel direction
for Negative sign
Positioning control to move the axis designated with the sequence program
positioning commands by the designated travel value from the current stop
position.
Fixed-pitch feed control uses the FEED-1 servo instruction.
Common
Number of
Controllable
Axes
∆
! ! !
1
(1) Positioning control through the designated travel value from the current stop
position (0).
(2) The travel direction is designated by the sign of the travel value, as follows:
• Positive travel value ............ forward direction (increased address)
• Negative travel value........... reverse direction (decreased address)
Commanded speed
Travel direction
for Positive sign
SVST
instruction
Fig.7.23 1-Axis Fixed-Pitch Feed Control
POINT
Do not set the travel value to zero for fixed-pitch feed control.
If the travel value is set t o zero, fixed-pitch feed ends with no feed taking
place.
Items Set by Peripherals
Arc
∆ ∆
Operation timing
V
Fixed-pitch feed using FEED-1 instruction
Forward
direction
Travel value
: indicates set data
7 − 51
Parameter Block
∆ ∆ ∆ ∆ ∆ ∆
Others
∆ ∆ ∆
OK
! : Must be set
∆ : Set if required
t