81
12.3.2 Terminal connection diagram
Figure 12-5 shows the connection to terminal boards in DC input unit (QX40) and transistor output unit
(QY40P). Since DC input unit and transistor output are non-voltage, you have to provide a DC24V power
supply (DC12V is unacceptable) and a DC24V or DC12V power supply for transistor output unit separately.
If the facility instrument side has a level input, you have to prepare a pulse-level conversion circuit
separately, as shown in the figure 12-6.
Power supply polarity here is different from QX40.
Keep this in mind when connecting.
QX40 terminal board
0
X1
X1
X2
Xa
Xb
Xa
Xb
X2
1
2
F
COM
NC
...
0
1
2
F
COM
...
QY40P terminal board
DC24V
power supply
DC24V
power supply
Internal power
supply
Local wiring
Operation status
output signal
Malfunction status
output signal
Power
supply
Power
supply
ON input signal
OFF input signal
Facility Instrument
[contact specification] (X1, X2)
Use a micro current contact for
4mA or smaller contact current.
[Load specification] (Xa, Xb)
Maximum current to be fed to
output terminal is 100mA.
If the current exceeds that limit,
connect a relay.
A connection for internal power supply is needed.
If this is unconnected, QY40P’s LED will be on,
but no signal will be output.
Figure 12-5 General-purpose control terminal connection diagram
Operation explanation
ON pulse signal will generate ON level
signal for control output signal, OFF pulse
signal will turn off the control output signal.
* The circuit example here a-contact output
specification.
Internal power supply: 17
Output 2: OFF
Output 1: ON
Output 2: OFF
Output 1: ON
X1
1s
DC12V/24V
X1
X1
X2
X2
COM: 18
PLC DO board
Local wiring
Control signal output
Load drive power supply
Performance sequence
Control output signal
Recommended relay
X1: a-contact
X2: b-contact
* Both X1 and X2 are MY2N-D: OMRON
equivalent products
ON
OFF
Load
Figure 12-6 Pulse-level conversion circuit example
●
●
Provide a switch circuit for emergency ON and OFF in case of a PLC malfunction.
CAUTION
Summary of Contents for Central Controller G-50A
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