12 CONTROL SUB FUNCTIONS

MELSEC-Q

(5)During simultaneous start, a stroke limit check is carried out for the current values of every axis to be started. Every axis will not start if an error occurs, even if it only occurs in one axis.

[5]Setting the software stroke limit function

To use the "software stroke limit function", set the required values in the parameters shown in the following table, and write them to the QD75.

The set details are validated at the rising edge (OFF ON) of the PLC READY signal (Y0).

 

 

Setting item

Setting

 

 

Setting details

Factory-set

 

 

value

 

 

initial value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software stroke

 

 

 

 

 

 

 

 

Pr.12

 

limit upper limit

 

Set the upper limit value of the moveable range.

2147483647

 

 

 

value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software stroke

 

 

 

 

 

 

 

 

Pr.13

 

limit lower limit

 

Set the lower limit value of the moveable range.

–2147483648

 

 

 

value

 

 

 

 

 

 

 

 

 

 

 

 

Set whether to use the "

 

Current feed value" or

 

 

 

 

Software stroke

 

Md.20

0: Current feed

 

Pr.14

 

limit selection

 

"

 

Machine feed value" as the "current value".

value

 

 

 

 

Md.21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Software stroke

 

Set whether the software stroke limit is validated or

 

 

Pr.15

 

limit valid/invalid

0:Valid

invalidated during manual control (JOG operation,

0: valid

 

 

 

setting

 

Inching operation, manual pulse generator operation).

 

Refer to Section 5.2 "List of parameters" for setting details.

[6] Invalidating the software stroke limit

To invalidate the software stroke limit, set the following parameters as shown, and write them to the QD75.

Pr.12

Software stroke limit upper limit value

=

Pr.13

Software stroke limit lower limit value

(For manual operation, set "0: software stroke limit invalid" in the "

Pr.15

Software stroke limit valid/invalid setting".)

The set details are validated at the rising edge (OFF ON) of the PLC READY signal (Y0).

When the unit is "degree", the software stroke limit check is not performed during speed control (including speed control in speed-position switching control or position-speed switching control) or during manual control, independently of the values set in Pr.12 , Pr.13 and Pr.15 .

REMARK

Parameters are set for each axis.

It is recommended that the parameters be set whenever possible with GX Configurator-QP. Execution by sequence program uses many sequence programs and devices. The execution becomes complicated, and the scan times will increase.

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Mitsubishi Electronics QD75P, QD75D Setting the software stroke limit function, Invalidating the software stroke limit