4.Methods of Connection
30
4-3-3. Equivalent Circuit (Input)
The signal input circuit inputs a signal by short-circuiting or opening the input terminal
and COM terminal. Short-circuiting is performed by contact (relay, switch, etc.) or non-
contact (transistor, TTL open collector output, etc.)
4-3-4. Equivalent Circuit (Output)
The signal output circuit produces transistor open collector output.
Inside
IC=
COM
Push swich Toggle swich Relay contact Transistor
+12V
IN
IN
F395
Open:
OFF
Short circuit:
ON
・
No external voltage should be applied to the signal input circuit.
・
External elements should pass Ic=10mA or more.
・
Leaks of external elements should be 100
μ
A or less.
・
The external input circuit is minus (-) common. A circuit of source
type cannot be connected.
6mA
Approx.
TTL open collector output
(ON when IN is
‘
H
’
)
Vcc
+12V
COM
F395
・
For the relay driving power supply (Vext), prepare an external power
supply.
・
Do not short-circuit any load (relay coil, etc.); otherwise the output
transistor will be damaged.
・
Connect surge absorbers or spark killers to the relay circuit (coil side and
contact side) as shown in the illustration to minimize surge voltage.
Vext
Transistor state
Output data
Tr
0
OFF
1
ON
Vceo=30V
（
max
）
Ic=120mA
（
max
）
Inside
Relay
Spark killer
Load
Spark killer
Load
Varistor
AC power
supply
DC power
supply
Vcc
+12V
