Mitsubishi Melsec-Q QD75P1 User Manual page 71

3 SPECIFICATIONS AND FUNCTIONS
Logic setting
Negative logic
(Initial value)
Positive logic
3: Set the logic setting using " Pr.22 Input signal logic selection". For details of the settings, refer to
"Section 5.2.3 Detailed parameters 1" and "Section 13.4 External I/O signal logic switching function".
4: When using the upper limit signal (FLS) or lower limit signal (RLS), always wire it as a "b" (normally
closed) contact in the negative logic setting. The signal will turn OFF to stop positioning.
(a) Input signal ON/OFF status
The input signal ON/OFF status is defied by the external wiring and logic
setting.
This is explained below with the example of near-point dog signal (DOG).
(The other input signals also perform the same operations as the near-point
dog signal (DOG).)
3, 4
(Voltage not applied)
(Voltage applied)
(Voltage not applied)
(Voltage applied)
(b) About logic setting and internal circuit
In the QD75, the case where the internal circuit (photocoupler) is OFF in
the negative logic setting is defined as "input signal OFF".
Reversely, the case where the internal circuit (photocoupler) is OFF in the
positive logic setting is defined as "input signal ON".
<Photocoupler ON/OFF status>
When voltage is not applied : Photocoupler OFF
When voltage is applied
External wiring 4
DOG
24VDC
COM
DOG
24VDC
COM
DOG
24VDC
COM
DOG
24VDC
COM
3 - 23
ON/OFF status of near-point dog
signal (DOG) as seen from QD75
OFF
ON
ON
OFF
: Photocoupler ON
MELSEC-Q