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MELSEC-Q
12 CONTROL SUB FUNCTIONS
(5) During simultaneous start, a stroke limit c heck is carried out for the current
values of every axis to be started. Every ax is 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", s et 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 edg e (OFF ON) of the PLC READY
signal (Y0).
Setting item Setting
value Setting details Factory-set
initial value
Pr.12 Software stroke
limit upper limit
value Set the upper limit value of the moveable range. 2147483647
Pr.13 Software stroke
limit lower limit
value Set the lower limit value of the moveable range. –2147483648
Pr.14 Software stroke
limit selection
Set whether to use the " Md.20 Current feed value" or
"Md.21 Machine feed value" as the "current value".
0: Current feed
value
Pr.15 Software stroke
limit valid/invalid
setting 0:Valid Set whether the software stroke limit is validated or
invalidated during manual control (JOG operation,
Inching operation, manual pulse generator operation). 0: valid
Refer to Section 5.2 "List of parameters" for setting details.
[6] Invalidating the software stroke limit
To invalidate the software stroke limit, set th e fo llowing 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 str oke limit invalid" in the " Pr.15
Software stroke limit valid/invalid setting".)
The set details are validated at the rising edg e (OFF ON) of the PLC READY
signal (Y0).
When the unit is "degree", the software strok e limit check is not performed during
speed control (including speed control in sp eed-position switching control or
position-speed switching control) or duri ng 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 wh enever possible with GX
Configurator-QP. Execution by sequence program uses many sequence programs
and devices. The execution becomes com plicated, and the scan times will
increase.