8 OPR CONTROL

MELSEC-Q

8.1Outline 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 QD75 issues a "OPR request" with the power turned ON or others, or after a positioning stop.

In the QD75, 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 QD75 to " Cd.3 Positioning start No.", and turning ON the positioning start signal.

The PSTRT start numbers of the dedicated instruction can also be set to 9001 or 9002 to execute the OPR control. (For details, refer to Chapter 14 "Dedicated instructions".)

(1)Establish a positioning control OP

"Machine OPR" (positioning start No. 9001)

(2)Carry out positioning toward the OP

"Fast OPR" (positioning start No. 9002).

The "machine OPR" in (1) above must always be carried out before executing the "fast OPR" in (2).

REMARK

OPR request

The "OPR request flag" ( Md.31 Status: b3) must be turned ON in the QD75, 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).

At the OFF ON of the PLC READY signal [Y0]

The address information stored in the QD75 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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Mitsubishi Electronics QD75P, QD75D user manual Outline of OPR control 8.1.1 Two types of OPR control