8.2 Example of Signal Connection
108
<Ex. 1> Control using the external switch (When the internal power supply
is used)
To control the START and STOP signals using a relay or switch, make connec-
tions as shown below:
<Ex. 2> Control using the transistor (When the external power supply is
used)
For control using a transistor or FET, make connections as shown below.
Design the respective signals at the minimum 6 mA.
10 kΩ
2.2 kΩ
ISO.DCV (15 V)
External I/O
input terminal
ISO.COM
External
input switch
Inside the 3174
Photocoupler
For connection to the input signal, provide a circuit that protects the relay and
switch from chattering to prevent malfunctioning.
10 kΩ
2.2 kΩ
ISO.DCV (15 V)
External I/O
input terminal
ISO.COM
Inside the 3174
I＞6 mA
Photocoupler
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