Mitsubishi Electronics QD75D Skip request from an external source, External command function

3 SPECIFICATIONS AND FUNCTIONS

MELSEC-Q

Signal name

Pin No.

Signal details

AX1

AX2

AX3

AX4

(Negative logic is selected by external I/O signal logic selection)

• Input this signal to stop positioning.

• When this signal turns ON, the QD75 will stop the positioning being

Stop signal

1A4

1B4

2A4

2B4

executed.

After that, even if this signal is turned from ON to OFF, the system will not

start.

• Input a control switching signal during speed-position or position-speed

switching control.

External command signal

1A5

1B5

2A5

2B5

• Use this signal as the input signal of positioning start, speed change request,

and skip request from an external source.

Set the function to use this signal in "

External command function

Pr.42

selection".

Common

1A6

1B6

2A6

2B6

• Common for upper/lower limit, near-point dog, stop, and external command

1A7

1B7

2A7

2B7

signals.

• This signal turns ON when the drive unit is normal and can accept the feed

pulse.

• The QD75 checks the drive unit READY signal, and outputs the OPR request

if the system is not in the READY state.

Drive unit READY

1A11

1B11

2A11

2B11

• When the drive unit is inoperable, such as if an error occurs in the drive unit's

control power supply, this signal will turn OFF.

• If this signal is turned OFF during positioning, the system will stop. The

system will not start even if this signal is turned ON again.

• When this signal turns OFF, the OPR complete signal will also turn OFF.

Drive unit READY common

1A12 1B12 2A12 2B12 • Common for drive unit READY signal.

• This signal is output during machine OPR. (Note that it is not output during

the count method 2 .)

(Example) When machine OPR is carried out in the stopper 2

method.

Speed

Pr.46 OPR speed

Stopper

Pr.47 Creep speed

Time

Near-point dog

Deviation counter clear

1A13 1B13 2A13 2B13

Zero signal

OFF

ON

Pr.55 Deviation counter

CLEAR

clear signal output time

OFF

ON

After feed pulse output stops

•The output time of the deviation counter clear signal is set in " Pr.55 Deviation counter clear signal output time".

•Use the drive unit that can reset the droop pulse amount in the internal

deviation counter when the QD75 turns this signal ON.

(Note) The deviation counter clear is a signal output by the QD75 during machine OPR. It cannot be output randomly by the user.

Deviation counter clear common 1A14 1B14 2A14 2B14 • Common for deviation counter clear signal

3 - 21