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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] Precaution during control
(1) The following table shows whether the OPR retry function may be executed
by the "
Pr.43
OPR method".
Pr.43
OPR method
Execution status of OPR retry function
Near-point dog method
: Execution possible
Count method 1)
: Execution possible
Count method 2)
: Execution possible
Data set method
:
(2) Always establish upper/lower limit switches at the upper/lower limit positions
of the machine, and connect an QD75MH module. If the OPR retry function
is used without hardware stroke limit switches, the motor will continue
rotation until a hardware stroke limit signal is detected.
(3) Always wire QD75MH upper/lower limit switches even when the OPR
function is invalidated. Control cannot be carried out with the QD75MH
unless the wiring is carried out.
(4) Do not carry out settings so that the servo amplifier power turns OFF by the
upper/lower limit switches connected to the QD75MH. If the servo amplifier
power is turned OFF, the OPR retry cannot be carried out.
(5) The operation decelerates upon detection of the hardware limit signal, and
the movement starts in the opposite direction. In this case, however, an
error (104, 105) is not produced.
[3] Setting the OPR retry function
To use the "OPR retry function", set the required details in the parameters shown
in the following table, and write them to the QD75MH.
When the parameters are set, the OPR retry 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). Set "
Pr.57
Dwell time during OPR retry"
according to the user's requirements.
Setting item
Setting
value
Setting details
Factory-set
initial value
Pr.48
OPR retry 1 Set "1: Carry out OPR retry by limit switch". 0
Pr.57
Dwell time during
OPR retry
Set the deceleration stop time during OPR retry.
(Random value between 0 and 65535 (ms))
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 PLC program uses many PLC programs and
devices. The execution becomes complicated, and the scan times will increase.