Mitsubishi Electric FR-S500 Series Instruction Manual page 21

Control circuit
2) Source logic type
• In this logic, a signal switches on when a current flows into the corresponding signal
input terminal.
Terminal PC is common to the contact input signals. For the open collector output
signals, terminal SE is a positive external power supply terminal.
PC
Power
supply STF
STR
• Connecting the 0V terminal of the
external power supply for transistor
output to terminal SD prevents a
malfunction caused by an undesirable
current.
R
R
16
Inverter
RUN
SE
24VDC
AY80
transistor
output module
9
PC
STF
1
2
STR
SD
10
Current flow
AX80
1
R
R
9
Inverter
24VDC
(SD)