Mitsubishi Electronics QD75P Change signal, CCW Counterclockwise, Refer to term Feedback Pulse

APPENDICES

MELSEC-Q

BIPOLAR DRIVE CONSTANT-CURRENT SYSTEM

This is one system for driving a stepping motor. In this method, the orientation of the excitation current flowing to the stator coil is reversed, and the excitation current direction is in both the positive and negative direction. This enables the motor coil to be used effectively, and a large output torque can be obtained at low speeds.

A phase

Bipolar drive basic circuit (bridge method)

BUFFER MEMORY

Memory used to temporarily store data. Before writing external data to the PLC CPU data memory, it is first temporarily stored in the buffer memory to be used for operation by the program. The buffer memory is used by the positioning module because the latest data can be read and written.

PLC CPU	Positioning module
	Bus		External
Data		Buffer	data
	Data is written/read
memory		memory
	using the following

commands: Write : TO Read : FROM

CHANGE signal

The CHANGE signal is an external signal used to switch the speed-position control from the speed control being executed to position control.

CIRCULAR INTERPOLATION

Automatic operation in which the machine path makes a circle when positioning is carried out by simultaneously operating both the longitudinal feed and latitudinal feed motors. The normal unit is 90ø. Round shapes can be created with this type of interpolation, and obstacles in the machine path can also be avoided. Refer to the terms "INTERPOLATION OPERATION" and "LINEAR INTERPOLATION"

Obstacle

A B C D

Collision

COMMAND PULSE

Refer to term "FEEDBACK PULSE".

COMPOSITE SPEED

The movement speed for the target control during interpolation operations.

Y axis	Composite speed
speed
	X axis speed

BUSY

The device is doing some other work. It is in a positioning operation or in dwell time.

CCW (Counterclockwise)

Rotation in the counterclockwise direction. In the motor, this is determined looking from the shaft end side. Also refer to "CW".

CONTROL UNIT

This is one type of positioning reference data. The unit to be used is designated as mm, inch, degree, or pulse.

Appendix - 72