Mitsubishi Electronics QD75P, QD75D Speed-position switching control ABS mode, Unit setting

9 MAJOR POSITIONING CONTROL

9.2.17 Speed-position switching control (ABS mode)

MELSEC-Q

In case of "speed-position switching control (ABS mode)" (" Da.2 Control system" = Forward run: speed/position, Reverse run: speed/position), the pulses of the speed set in " Da.8 Command speed" are kept output in the axial direction set to the positioning data. When the "speed-position switching signal" is input, position control to the address set in " Da.6 Positioning address/movement amount" is exercised.

"Speed-position switching control (ABS mode)" is available in two different types: "forward run: speed/position" which starts the axis in the forward run direction and "reverse run: speed/position" which starts the axis in the reverse run direction.

"Speed-position switching control (ABS mode)" is valid only when " Pr.1 is "2: degree".

Unit setting

mm inch degree pulse

Speed-position function selection

INC mode

ABS mode

: Setting allowed,

Unit setting"

: Setting disallowed (If setting is made, an error (error code: 935) will occur when the PLC READY signal (Y0) turns ON.)

Use the detailed parameter 1 " Pr.150 Speed-position function selection" to choose "speed-position switching control (ABS mode)".

Setting item		Setting	Setting details	Buffer memory address
		value		Axis 1	Axis 2	Axis 3	Axis 4
	Speed-
Pr.150	position	2	Speed-position switching control	34	184	334	484
	function		(ABS mode)
	selection

If the set value is other than 0 and 2, it is regarded as 0 and operation is performed in the INC mode.

For details of the setting, refer to Section 5.2 "List of parameters".

Switching over from speed control to position control

(1)The control is switched over from speed control to position control by the external signal "speed-position switching signal".

(2) Besides setting the positioning data, the "

Cd.24

Speed-position switching

enable flag" must also be turned ON to switch over from speed control to

position control. (If the "

Cd.24

Speed-position switching enable flag" turns

ON after the speed-position switching signal turns ON, the control will continue as speed control without switching over to position control. Only position

control will be carried out when the "

Cd.24

Speed-position switching enable

flag" and speed-position switching signal are ON at the operation start.)

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