Chapter 8 Opr Control; Outline Of Opr Control; Two Types Of Opr Control - Mitsubishi Electric MELSEC-L LD75P User Manual

CHAPTER 8
8.1

Outline of OPR Control

8.1.1

Two types of OPR control

In "OPR control" a position is established as the starting point (or "OP") when carrying out positioning control, and
positioning is carried out toward that starting point.
It is used to return a machine system at any position other than the OP to the OP when the LD75 issues a "OPR
*1
request" with the power turned ON or others, or after a positioning stop.
In the LD75, the two types of controls shown below are defined as "OPR control", following the flow of the OPR work.
These two types of OPR control can be executed by setting the "OPR parameters", setting "Positioning start No. 9001"
and "Positioning start No. 9002" prepared beforehand in the LD75 to "[Cd.3] Positioning start No.", and turning ON the
positioning start signal.
The ZP.PSTRT start numbers of the dedicated instruction can also be set to 9001 or 9002 to execute the OPR
control.
(Refer to  Page 619, CHAPTER 14 for details.)
• Establish a positioning control OP  "Machine OPR" (positioning start No. 9001)
• Carry out positioning toward the OP  "Fast OPR" (positioning start No. 9002).
The "machine OPR" must always be carried out before executing the "fast OPR".
*1 The "OPR request flag" ([Md.31] Status: b3) must be turned ON in the LD75, and a machine OPR must be executed in
the following cases.
• When the power is turned ON
• At the ON  OFF of the drive unit READY signal ([Md.30] External input/output signal: b2).
• When the PLC READY signal [YO] turns from OFF to ON.
The address information stored in the LD75 cannot be guaranteed while the "OPR request flag" is ON.
The "OPR request flag" turns OFF and the "OPR complete flag" ([Md.31] Status: b4) turns ON if the machine OPR is
executed and is completed normally.
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OPR CONTROL