12 CONTROL SUB FUNCTIONS

MELSEC-Q

The following drawing shows the differences in the operation when "

Md.20

Current feed value" and " range limit check.

Md.21

Machine feed value" are used in the moveable

[Conditions]

Assume the current stop position is 2000, and the upper stroke limit is set to 5000.

 

Moveable range

 

Md. 20 Current feed value

2000

5000

Md. 21 Machine feed value

2000

5000

 

Stop position

Upper stroke limit

[Current value changing]

When the current value is changed by a new current value command from 2000 to 1000, the current value will change to 1000, but the machine feed value will stay the same at 2000.

1)When the machine feed value is set at the limit

The machine feed value of 5000 (current feed value: 4000) becomes the upper stroke limit.

 

Moveable range

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000

 

 

 

Md. 20 Current feed value

4000

5000

Md. 21 Machine feed value

2000

5000

6000

Upper stroke limit

2)When the current feed value is set at the limit

The current feed value of 5000 (machine feed value: 6000) becomes the upper stroke limit.

Md. 20 Current feed value Md. 21 Machine feed value

Moveable range

1000

4000

5000

2000

5000

6000

Upper stroke limit

Fig. 12.16 Software stroke limits of the current feed value and machine feed value

POINT

When "machine feed value" is set in "

Pr.14

Software stroke limit selection", the

moveable range becomes an absolute range referenced on the OP. When "current feed value" is set, the moveable range is the relative range from the "current feed value".

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Image 503
Mitsubishi Electronics QD75D, QD75P Current feed value and range limit check, When machine feed value is set, Pr.14