MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 486)

12 - 10
MELSEC-Q
12 CONTROL SUB FUNCTIONS
(2) OP shift operation at the " Pr.47 Creep speed"
(When " Pr.56 Speed designation during OP shift" is 1)
When the " Pr. 53 OP
shift amount" is negative
When the " Pr. 53 OP
shift amount" is positive
Pr. 44 OPR
direction
Zero point
Machine OPR start
Near-point dog
Zero signal
OP
Pr. 47 Creep
speed
Fig. 12.7 OP shift operation at the creep speed
[4] Precautions during control
The following data are set after the OP shift amount is complete.
•
OPR complete flag (" Md.31 Status: b4)
• Md.20 Current feed value
• Md.21 Machine feed value
• Md.26 Axis operation status
• Md.34 Movement amount after near-point dog ON (" Pr.53 OP shift
amount" is not added.)
• OPR request flag ( Md.31 Status: b3) is reset after completion of the OP
shift.
[5] Setting the OP shift function
To use the "OP shift function", set the required details in the parameters shown in
the following table, and write them to the QD75.
When the parameters are set, the OP shift function will be added to the machine
OPR control. The set details are validated at the rising edge (OFF ON) of the
PLC READY signal (Y0).
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.53 OP shift amount Set the shift amount during the OP shift. 0
Pr.56
Speed
designation
during OP shift
Select the speed during the OP shift
0: Pr.46 OPR speed
1: Pr.47 Creep speed
0
Refer to Section 5.2 "List of parameters" for setting details.
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.