21
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.
•
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.)
⋅
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.
Current
PC
STF
R
STR
R
Source logic
Source
connector
Current
SD
STF
R
STR
R
Sink
connector
Sink logic
Current flow concerning the input/output signal
when sink logic is selected
Current flow concerning the input/output signal
when source logic is selected
DC input (source type)
<Example: AX80>
24VDC
RUN
SE
1
9
R
Inverter
R
Current flow
+
-
+
-
DC input (sink type)
<Example: AX40>
Inverter
24VDC
RUN
SE
1
9
R
R
Current flow
AY40 type
transistor
output unit
1
2
9
10
24VDC SD
PC
STR
STF
Inverter
24VDC
(SD)
9
Current flow
AY80 type
transistor
output unit
9
1
2
10
PC
STF
STR
SD
Inverter
24VDC
(SD)
24VDC
Current flow
Summary of Contents for FR-F 700 EC
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