9 MAJOR POSITIONING CONTROL

MELSEC-Q

Major positioning control

 

 

 

Details

Da.2 Control system

 

 

 

 

 

 

 

 

 

Forward run

The control is continued as position control (positioning for

Speed-position switching control

speed/position

the designated address or movement amount) by turning

 

 

Reverse run

ON the "speed-position switching signal" after first carrying

 

 

speed/position

out speed control.

 

 

Forward run

The control is continued as speed control by turning ON

 

 

position/speed

Position-speed switching control

the "position-speed switching signal" after first carrying out

 

 

Reverse run

position control.

 

 

position/speed

 

 

 

 

 

 

 

NOP

 

A nonexecutable control system. When this instruction is

 

NOP instruction

set, the operation is transferred to the next data operation,

 

instruction

 

 

and the instruction is not executed.

 

 

 

 

 

 

The current feed value (

 

) is changed to an address

 

 

 

Md.20

 

 

 

set in the positioning data.

 

Current value

 

This can be carried out by either of the following 2

 

Current value changing

methods.

 

changing

(The machine feed value cannot be changed.)

 

 

Other control

 

 

Current value changing using the control system

 

 

 

Current value changing using the current value

 

 

 

 

changing start No. (No. 9003).

 

JUMP

JUMP instruction

An unconditional or conditional JUMP is carried out to a

 

instruction

designated positioning data No.

 

 

 

LOOP

LOOP

A repeat control is carried out by repeat LOOP to LEND.

 

 

 

Control is returned to the top of the repeat control by

 

LEND

LEND

repeat LOOP to LEND. After the repeat operation is

 

 

 

completed specified times, the next positioning data is run.

In "2-axis linear interpolation control", "3-axis linear interpolation control", "4-axis linear interpolation control", "2-axis fixed-feed control", "3-axis fixed-feed control", "4-axis fixed-feed control", "2-axis circular interpolation control", "2-axis speed control", "3-axis speed control" and "4-axis speed control", control is carried out so that linear and arc paths are drawn using a motor set in two or more axes directions. This kind of control is called "interpolation control". (Refer to Section 9.1.6 "Interpolation control" for details.)

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Mitsubishi Electronics QD75D Speed-position switching control Speed/position, Reverse run, Instruction is not executed