Mitsubishi Electronics QD75P, QD75D user manual Detail of output signals PLC CPU QD75

3SPECIFICATIONS AND FUNCTIONS

Important

MELSEC-Q

1: The BUSY signal turns ON even when position control of movement amount 0 is executed. However, since the ON time is short, the ON status may not be detected in the sequence program.

2: "Positioning complete" of the QD75 refers to the point when the pulse output from QD75 is completed.

Thus, even if the QD75's positioning complete signal turns ON, the system may continue operation.

3.3.3 Detail of output signals (PLC CPU QD75)

The ON/OFF timing and conditions of the output signals are shown below.

Device No.		Signal name								Details
Y0	PLC READY		OFF:	(a) This signal notifies the QD75 that the PLC CPU is normal.
			PLC READY OFF		• It is turned ON/OFF with the sequence program.
			ON:		• The PLC READY signal is turned ON during positioning
			PLC READY ON		control, OPR control, JOG operation, inching operation, and
					manual pulse generator operation, unless the system is in the
					peripheral device test mode.
				(b) When parameters are changed, the PLC READY signal is turned
				OFF depending on the parameter (Refer to Chapter 7.).
				(c) The following processes are carried out when the PLC READY
				signal turns from OFF to ON.
					• The parameter setting range is checked.
					• The QD75 READY signal [X0] turns ON.
				(d) The following processes are carried out when the PLC READY
				signal turns from ON to OFF.
				In these cases, the OFF time should be set to 100ms or more.
					• The QD75 READY signal [X0] turns OFF.
					• The operating axis stops.
					• The M code ON signal [X4 to X7] for each axis turns OFF, and
					"0" is stored in "					Valid M code".
									Md.25
				(e) When parameters or positioning data (No. 1 to 600) are written
				from the peripheral device or PLC CPU to the flash ROM, the
				PLC READY signal will turn OFF.
Y4	Axis 1	Axis stop	OFF:	• When the axis stop signal turns ON, the OPR control, positioning
Y5	Axis 2		Axis stop not	control, JOG operation, inching operation and manual pulse
Y6	Axis 3		requested	generator operation will stop.
Y7	Axis 4		ON:	• By turning the axis stop signal ON during positioning operation, the
			Axis stop requested	positioning operation will be "stopped".
				• Whether to decelerate or suddenly stop can be selected with
				"		Stop group 3 sudden stop selection".
					Pr.39
				• During interpolation control of the positioning operation, if the axis
				stop signal of any axis turns ON, all axes in the interpolation
				control will decelerate and stop.
Y8	Axis 1	Forward run JOG start	OFF:	• When the JOG start signal is ON, JOG operation will be carried
Y9	Axis 1	Reverse run JOG start	JOG not started
				out at the "			Cd.17	JOG speed". When the JOG start signal turns
YA	Axis 2	Forward run JOG start	ON:
				OFF, the operation will decelerate and stop.
YB	Axis 2	Reverse run JOG start	JOG started
				• When inching movement amount is set, the designated movement
YC	Axis 3	Forward run JOG start
				amount is output for one control cycle and then the operation
YD	Axis 3	Reverse run JOG start
				stops.
YE	Axis 4	Forward run JOG start
YF	Axis 4	Reverse run JOG start
Y10	Axis 1	Positioning start	OFF:	• OPR operation or positioning operation is started.
Y11	Axis 2		Positioning start not	• The positioning start signal is valid at the rising edge, and the
Y12	Axis 3		requested	operation is started.
Y13	Axis 4		ON:	• When the positioning start signal turns ON during BUSY, the
			Positioning start	operation starting warning will occur (warning code: 100).
			requested
Y14	Axis 1	Execution prohibition	OFF:	• If the execution prohibition flag is ON when the positioning start
Y15	Axis 2	flag	Not during execution	signal turns ON, positioning control does not start until the
Y16	Axis 3		prohibition	execution prohibition flag turns OFF. (Pulse output not provided)
Y17	Axis 4		ON:	Used with the "Pre-reading start function". (Refer to Section
			During execution	12.7.8)
			prohibition

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