Mitsubishi Electronics QD75D, QD75P user manual 6 1-axis fixed-feed control

9MAJOR POSITIONING CONTROL

9.2.6 1-axis fixed-feed control

MELSEC-Q

In "1-axis fixed-feed control" ("

Da.2

Control system" = fixed-feed 1), one motor is

used to carry out fixed-feed control in a set axis direction.

In fixed-feed control, any remainder of the movement amount designated in the positioning data is rounded down if less than that required for control accuracy to output the same amount of pulses. (The remainder of the movement amount with an accuracy below the control accuracy does not affect the regular controls.)

Operation chart

In 1-axis fixed-feed control, the address ( Md.20

Current feed value) of the current

stop position (start point address) is set to "0". Positioning is then carried out to a

position at the end of the movement amount set in "

Da.6

Positioning

address/movement amount".

The movement direction is determined by the movement amount sign.

" Md. 20 Current feed value" is set to "0" at the positioning start

0 0 0 0 0

Positioning
start	amount

Stop position

Reverse direction Forward direction

Movement direction for	Movement direction for
a negative movement amount	a positive movement amount

Restrictions

(1)An axis error "Continuous path control not possible (error code: 516)" will occur and the operation cannot start if "continuous path control" is set in

"

Da.1

Operation pattern". ("Continuous path control" cannot be set in fixed-

feed control.)

(2) "Fixed-feed" cannot be set in "

Da.2

Control system" in the positioning data

when "continuous path control" has been set in "

Da.1

Operation pattern" of

the immediately prior positioning data. (For example, if the operation pattern of positioning data No. 1 is "continuous path control", fixed-feed control cannot be set in positioning data No. 2.) An axis error "Continuous path control not possible (error code: 516)" will occur and the machine will carry out a deceleration stop if this type of setting is carried out.

9 - 43