Terminal Connection Diagram - Mitsubishi Electric G-50A Technical Manual

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.
0
1
2
F
COM
DC24V
NC
power supply
QX40 terminal board
0
1
2
F
Internal power
supply
COM
DC24V
QY40P terminal board
power supply
Local wiring
Figure 12-5 General-purpose control terminal connection diagram
Output 1: ON
Output 2: OFF
Internal power supply: 17
COM: 18
PLC DO board
Performance sequence
Output 1: ON
Output 2: OFF
Control output signal
CAUTION
Operation status
X1
output signal
X1
Malfunction status
X2
output signal
X2
Power
supply
Xa
ON input signal
Xb
OFF input signal
Power
supply
Xa
Xb
A connection for internal power supply is needed.
If this is unconnected, QY40P's LED will be on,
but no signal will be output.
Power supply polarity here is different from QX40.
Keep this in mind when connecting.
X1
X2
Local wiring
1s
ON OFF
Figure 12-6 Pulse-level conversion circuit example
Provide a switch circuit for emergency ON and OFF in case of a PLC malfunction.
Facility Instrument
X1 Control signal output
X1
X2
Load
Load drive power supply
DC12V/24V
Recommended relay
X1: a-contact
X2: b-contact
* Both X1 and X2 are MY2N-D: OMRON
equivalent products
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.
[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.
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