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MELSEC-Q
3 SPECIFICATIONS AND FUNCTIONS
3.2 List of functions3.2.1 QD75 control functions
The QD75 has several functions. In this manual , the QD75 functions are categorized
and explained as follows.

Main functions

(1) OPR control
"OPR control" is a function that established the start point for carr ying out
positioning control, and carries out positioning toward that start p oint. This is
used to return a workpiece, located at a position other than the OP wh en the
power is turned ON or after positioning stop, to the OP. The "OPR co ntrol" is
preregistered in the QD75 as the "Positioning start data No. 9001 ( Machine
OPR)", and "Positioning start data No. 9002 (Fast OPR). (Refer to Chapter 8
"OPR Control".)
(2) Major positioning control
This control is carried out using the "Positioning data" store d in the QD75.
Positioning control, such as position control and speed control, is executed by
setting the required items in this "positioning data" and start ing that positioning
data. An "operation pattern" can be set in this "positioning data", a nd with this
whether to carry out control with continuous positioning data (ex.: position ing
data No. 1, No. 2, No. 3, ...) can be set. (Refer to Chapter 9 "Major Positioning
Control".)
(3) High-level positioning control
This control executes the "positioning data" stored in the QD75 us ing the
"block start data". The following types of applied positioning contro l can be
carried out.
•Random blocks, handling several continuing positioning data items as
"blocks", can be executed in the designated order.
•"Condition judgment" can be added to position control and speed c ontrol.
•The operation of the designated positioning data No. that is set for m ultiple
axes can be started simultaneously. (Pulses are output simultaneousl y to
multiple servos.)
•The designated positioning data can be executed repeatedly, etc.,
(Refer to Chapter 10 "High-level Positioning Control".)
(4) Manual control
By inputting a signal into the QD75 from an external source, the QD75 will
output a random pulse train and carry out control. Use this manual contro l to
move the workpiece to a random position (JOG operation), and to fin ely adjust
the positioning (inching operation, manual pulse generator operation) , etc.
(Refer to Chapter 11 "Manual Control".)

Sub functions

When executing the main functions, control compensation, limits and f unctions can
be added. (Refer to Chapter 12 "Control Sub Functions".)

Common functions

Common control using the QD75 for "parameter initialization" or "backup of
execution data" can be carried out. (Refer to Chapter 13 "Common Functio ns".)