Specifications

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CHAPTER1 PRODUCT OUTLINE

1.1 Positioning Control

1.1.1 Features of QD75

The features of the QD75 are shown below.

(1) Availability of modules for one-, two- and four- axis controls

(a) There are three models available for both the open collector system pulse

output (QD75P1, QD75P2, and QD75P4) and differential driver system pulse

output (QD75D1, QD75D2, and QD75D4).

An optimum model can be selected by the drive unit type and the number of

axes.

(b) For connecting any of the QD75 modules to the base unit, a single slot and

32 I/O points are required.

Within the limit imposed by the maximum I/O points of the PLC CPU, up to 64

modules can be used.

(2) Positioning control function

(a) A wide variety of positioning control functions for positioning systems is

supported.

1) Up to 600 positioning data to each of which information such as

positioning address, control system, and operation pattern can be

specified can be set for each axis.

As all positioning data are stored in a buffer memory, they can be

read/written freely.

2) For independent control of each axis, linear control is executable

simultaneously over four axes.

Such control can either be the independent positioning control using a

single positioning data or the continuous positioning control enabled by

the continuous processing of multiple positioning data.

3) For coordinated control over multiple axes, the QD75 allows the linear

interpolation through the speed or position control of two to four axes or

the circular interpolation on two axes.

Such control can either be the independent positioning control using a

single positioning data or the continuous positioning control enabled by

the continuous processing of multiple positioning data.

(b) For each positioning data, the user can specify any of the following control

methods: position control, fixed-feed control, speed control, speed-position

switching control, position-speed switching control, and so on.

1) Six different machine OPR methods are provided: the zeroing dog method

(one method), stopper methods (three methods) and count methods (two

methods).

2) The OPR retry function facilitates the machine OPR control from an

arbitrary position.

(The machine OP is a premier reference position in positioning control,

and is set by the machine OPR mentioned in 1) above.)