Mitsubishi Electronics QD75P, QD75D user manual Position-speed switching signal setting

9 MAJOR POSITIONING CONTROL

MELSEC-Q

Position-speed switching signal setting

The following table shows the items that must be set to use the external command signals (CHG) as position-speed switching signals.

	Setting item		Setting	Setting details	Buffer memory address
			value		Axis 1	Axis 2	Axis 3	Axis 4
		External		Set the "2: speed-position and
		command
Pr.42			2	position-speed switching	62	212	362	512
		function
				requests".
		selection
		External		Set "1: Validate external
	Cd.8	command	1		1505	1605	1705	1805
				command".
		valid

Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for information on the setting details.

Changing the speed control command speed

In "position-speed switching control", the speed control command speed can be changed during the position control.

(1)The speed control command speed can be changed during the position control of position-speed switching control.

A command speed change request will be ignored unless issued during the position control of the position-speed switching control.

(2) The "new command speed" is stored in "

Cd.25

Position-speed switching

control speed change register" by the sequence program during position control.

This value then becomes the speed control command speed when the position-speed switching signal turns ON.

Position Speed

control control

Position-speed switching control start Position control start

t

Speed change

enable

				ON
Position-speed switching	OFF
signal						Setting after the position-speed
Cd.25 Position-speed						switching signal ON is ignored.
		0	V2		V3
switching control
speed change register

V2 becomes the speed control command speed.

Position-speed switching latch flag

Md.31 Status: b5

Stop signal

ON

OFF

ON

OFF

Fig. 9.20 Speed control speed change timing

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