3: I
NSTALLATION
AND
W
IRING
« FC4A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
»
3-15
Contact Protection Circuit for Relay and Transistor Outputs
Depending on the load, a protection circuit may be needed for the relay output of the
MicroSmart
modules. Choose a pro-
tection circuit from A through D shown below according to the power supply and connect the protection circuit to the out-
side of the CPU or relay output module.
For protection of the transistor output of the
MicroSmart
modules, connect protection circuit C shown below to the transis-
tor output circuit.
Protection Circuit A
Protection Circuit B
Protection Circuit C
Protection Circuit D
Inductive Load
COM
C
R
Output Q
This protection circuit can be used when the load impedance is
smaller than the RC impedance in an AC load power circuit.
R: Resistor of approximately the same resistance value as the load
C: 0.1 to 1 µF
Inductive Load
COM
R
Output Q
This protection circuit can be used for both AC and DC load power
circuits.
R: Resistor of approximately the same resistance value as the load
C: 0.1 to 1 µF
C
+
or
–
Inductive Load
COM
Output Q
This protection circuit can be used for DC load power circuits.
Use a diode with the following ratings.
Reverse withstand voltage: Power voltage of the load circuit
×
10
Forward current:
More than the load current
+
–
Inductive Load
COM
Output Q
This protection circuit can be used for both AC and DC load power
circuits.
+
or
–
Varistor
Summary of Contents for FC4A-C10R2
Page 1: ...FC4A SERIES Micro Programmable Logic Controller User s Manual FC9Y B812 ...
Page 6: ...PREFACE 4 FC4A MICROSMART USER S MANUAL ...
Page 94: ...2 MODULE SPECIFICATIONS 2 74 FC4A MICROSMART USER S MANUAL ...
Page 184: ...6 ALLOCATION NUMBERS 6 20 FC4A MICROSMART USER S MANUAL ...
Page 218: ...8 ADVANCED INSTRUCTIONS 8 8 FC4A MICROSMART USER S MANUAL ...
Page 240: ...11 BINARY ARITHMETIC INSTRUCTIONS 11 8 FC4A MICROSMART USER S MANUAL ...
Page 244: ...12 BOOLEAN COMPUTATION INSTRUCTIONS 12 4 FC4A MICROSMART USER S MANUAL ...
Page 252: ...13 SHIFT ROTATE INSTRUCTIONS 13 8 FC4A MICROSMART USER S MANUAL ...
Page 274: ...15 WEEK PROGRAMMER INSTRUCTIONS 15 8 FC4A MICROSMART USER S MANUAL ...
Page 378: ...22 DUAL TEACHING TIMER INSTRUCTIONS 22 4 FC4A MICROSMART USER S MANUAL ...
Page 386: ...23 INTELLIGENT MODULE ACCESS INSTRUCTIONS 23 8 FC4A MICROSMART USER S MANUAL ...
Page 408: ...24 ANALOG I O CONTROL 24 22 FC4A MICROSMART USER S MANUAL ...
Page 426: ...26 COMPUTER LINK COMMUNICATION 26 6 FC4A MICROSMART USER S MANUAL ...