Chapter 7 Programming; Precautions On Programming - Mitsubishi Electric MELSEC Q Series User Manual

CHAPTER 7
This chapter describes sequence programs of the QD73A1.
When applying the program examples introduced in this chapter to the actual system, ensure the applicability and
confirm that they will not cause system control problems.
7.1

Precautions on Programming

(1) At power-on and operation start
At a power-on or operation start, execute OPR to confirm the original point (OP). When an OPR request is
issued, take the OPR into consideration.
(2) Near-point dog signal
Use a high-performance near-point dog signal. If Near-point dog signal is not input upon OPR, the workpiece
continues to move at the OPR speed.
(3) Measures against an overrun
By setting a stroke limit upper limit and lower limit of the QD73A1, an overrun can be prevented.
Note that this is only when the QD73A1 is operating normally. Set limit switches "upper limit switch" and "lower
limit switch" to ensure the safety of the entire system. It is recommended to establish an external circuit through
which the motor's power turns off when a limit switch turns on.
(4) Stroke limit upper limit value/lower limit value
Check that proper values are set in "
(5) Emergency stop signal
Establish an emergency stop circuit outside the programmable controllers.
(6) When errors are checked in a sequence program
Turn off PLC READY signal (Y2D) at error detection.
(7) Speed limit value
Pr.5
Check that a proper value is set.
(8)
JOG speed
Cd.3
Do not set a large value at the beginning; start operation at lower speed.
PROGRAMMING
Stroke limit upper limit" and "
Pr.1

CHAPTER 7 PROGRAMMING

Stroke limit lower limit".
Pr.2
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