Mitsubishi Electric FR-A740-00023 Instruction Manual page 37

Sink logic and source logic
⋅ In 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 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 type
Use terminal PC as a common terminal to prevent a
malfunction caused by undesirable current. (Do not
connect terminal SD of the inverter with terminal 0V of
the external power supply. When using terminals PC-
SD as a 24VDC power supply, do not install a power
supply in parallel in the outside of the inverter. Doing so
may cause a malfunction due to undesirable current.)
AY40 type
transistor
output unit
STF
1
STR
2
9
9
10
24VDC SD
Sink
connector
DC input (sink type)
<Example: AX40>
1
R
R
-
+
9
24VDC
Current flow
Inverter
24VDC
(SD)
PC
Current flow
Control circuit specifications
Current flow concerning the input/output signal
when source logic is selected
Source logic
PC
Current
STF
R
STR
R
Inverter
RUN
+
SE
24VDC
Current flow
⋅ Source logic type
When using an external power supply for transistor
output, use terminal SD as a common to prevent
misoperation caused by undesirable current.
AY80 type
transistor
output unit
9
1
2
10
Current flow
Source
connector
DC input (source type)
<Example: AX80>
1
R
R
-
9
Inverter
PC
24VDC
STF
(SD)
STR
SD
27
2