Mitsubishi Electric 800 Series Instruction Manual page 56

 Sink logic and source logic
• In the sink logic, a signal switches ON when a current flows from the corresponding signal input terminal. Terminal SD is
common to the contact input signals. Terminal SE is common to the open collector output signals.
• In the source logic, a signal switches ON when a current flows into the corresponding signal input terminal. Terminal PC
is common to the contact input signals. Terminal SE is common to the open collector output signals.
Current flow concerning the input/output signal
when sink logic is selected
Sink logic
Current
STF
R
STR
R
SD
Inverter
RUN
SE
• When using an external power supply for transistor output
Sink logic
Use the terminal PC as a common terminal, and perform wiring as
shown below. (Do not connect terminal SD of the inverter with the
terminal 0 V of the external power supply. When using terminals PC-
SD as a 24 VDC power supply, do not install an external power
supply in parallel with the inverter. Doing so may cause a malfunction
in the inverter due to undesirable currents.)
QY40P type transistor
output unit
TB1
TB2
TB17
Constant
voltage
circuit
TB18
24 VDC SD
Sink
connector
DC input (sink type)
<Example: QX40>
TB1
R
R
-
+ TB17
24 VDC
Current flow
Inverter
STF
24 VDC
(SD)
STR
PC
Current flow
Current flow concerning the input/output signal
when source logic is selected
Source logic
PC
Current
STF
R
STR
R
Inverter
RUN
+
SE
24 VDC
Current flow
Source logic
Use the terminal SD as a common terminal, and perform wiring as
shown below. (Do not connect terminal PC of the inverter with the
terminal +24 V of the external power supply. When using terminals
PC-SD as a 24 VDC power supply, do not install an external power
supply in parallel with the inverter. Doing so may cause a malfunction
in the inverter due to undesirable currents.)
QY80 type transistor
output unit
TB1
TB2
Constant
voltage
TB17
Fuse
circuit
TB18
Current flow
Source
connector
DC input (source type)
<Example: QX80>
TB1
R
R
- TB18
Inverter
PC
STF
24 VDC
(SD)
STR
SD
2. INSTALLATION AND WIRING
2.6 Control circuit
3
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9
10
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