Mitsubishi Electronics 13JW55 Manuel D’Utilisation

 

 

App. - 35

 

 

 
Appendix 4.22  Application example of positioning control 

The following is an example of a positioning system with a pulse generator that 

outputs pulses per motor, brake, and unit of distance. 

In this system, a command value is set with the digital switch, and this set command 

value is compared with the current value at start-up to determine in which direction, 

forward or reverse, the motor rotates. The current value in the register D16 is 

subtracted by 1 in forward direction, and incremented by 1 in reverse direction. 

Positioning is completed when the command value matches the current value. The 

current value is converted to a BCD value so that current position is represented in 

4-digit decimal numbers. 

 

X2

X0

X1

X20 to 23
X24 to 27
X28 to 2B
X2C to 2F

5

4

0

0

X1
X10
X100
X1000

X1000
X100
X10
X1

8

2

6

3

mm

mm

Command value setting switch

Current value display

Y4C to 4F
Y48 to 4B
Y44 to 47
Y40 to 43

Y70
Y71
Y72

Start

MELSEC-Q

Pulse 

generator

Home position

Forward 

rotation

Reverse 

rotation

Motor

Brake

Home 

position

Forward 

rotation

Reverse 

rotation

Brake

 

 

Project name 

QA-26 

Program name 

MAIN 

 

M0

0

X0

M2

M0

Y70

Y71

X2

During operation

Reads command value

Reverse rotation

Checks consistency with 
command value

Displays current value 
to exterior

D16

D15

<

D16

D15

>

M0

X1

D16

D15

=

SM400

D15

K4X20

BINP

Y72

Y71

Y70

D16

K1

-P

D16

K1

+P

M2

D16

K0

MOV

K4Y40

D16

BCD

Releases brake

Forward rotation

-1 during forward rotation

+1 during reverse rotation

Executes home position return

20

38

41

(always ON)