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MELSEC-Q
8 OPR CONTROL
8.2.6 OPR method (4): Data set method
The following shows an operation outline of the "Data set method" OPR method.
The " Data set method" method is effective when a "Near-point dog" does not used.
It can be used with absolute position system.
With the data set method OPR, the position where the machine OPR has been carried
out, is registered into the QD75MH as the OP, and the current feed value and feed
machine value is overwritten to an OP address.
Use the JOG or manual pulse generator operation to move the OP.
Operation chart
OPR start
The address upon execution
of the OPR is registered as
an OP address.
t
Fig. 8.9 Data set method OPR
Precautions during operation
(1) The zero point must have been passed before the OPR is carried out after the
power supply is turned ON. If the OPR is carried out without passing the zero
point even once, the "OPR restart zero point not passed error" will occur.
When the "Home positioning return (OPR) restart zero point not passed error"
occurs, perform the JOG or similar operation so that the servomotor makes
more than one revolution after an error reset, before carrying out the machine
OPR again.
However, if selecting "1: Not need to pass motor Z phase after the power
supply is switched on." with "
Pr.180
Function selection C-4", it is possible to
carried out the home position return (OPR).
(2) When it is not the case of the absolute position system, starting the data set
method OPR will be identical to the function of the current value change.
(3) The OPR data used for the data set method is the "OPR method" and "OP
address".
The OPR data other than that for the OPR method and OP address is not
used for the data set method OPR method, but if a value is set the outside the
setting rage, an error will occur when the PLC READY signal (Y0) is turned
ON so that the preparation complete (X0) is not turned OFF.
With the OPR data other than that for the OPR method and OP address, set
an arbitrary value (default value can be allowed) within each data setting
range so that an error will not occur upon receiving the PLC READY signal
ON.