Mitsubishi MELSEC-Q Series User Manual page 57

3
SPECIFICATIONS AND FUNCTIONS
(1) Input signal ON/OFF status
(a) Input signal ON/OFF status
Negative logic
(Default value)
Positive logic
(b) Logic setting and internal circuit
The input signal ON/OFF status is defined by the external wiring and logic setting.
The following shows an example of the near-point dog signal (DOG).
(The other input signals also perform the same operations as the near-point dog
signal (DOG).)
Logic
External wiring
*1
setting
(Voltage not applied)
(Voltage applied)
(Voltage not applied)
(Voltage not applied)
* 1 Set the logic setting using "Intelligent function module switch setting". For details of the setting
contents, refer to Section 5.6.
* 2 When using the upper limit signal (FLS) and/or the lower limit signal (RLS), always wire them/it as
the normally closed contact in the negative logic setting.
Turning OFF this signal stops positioning.
In the QD72P3C3, 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: Photocoupler ON
3.5 Specifications of I/O Interfaces with External Device
ON/OFF status of the near-point
*1,*2
dog signal (DOG) as seen from
DOG
24VDC
COM
DOG
24VDC
COM
DOG
24VDC
COM
DOG
24VDC
COM
3.5.4 Internal circuit of I/O interface
the QD72P3C3
OFF
ON
ON
OFF
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