8.2 Example of Signal Connection
110
<Ex. 1> Controlling the relay (When the external power supply is used)
To link the relay to an external device, make connections as shown below.
<Ex. 2> Obtaining a signal limit (When the internal power supply is used)
To obtain a signal limit, make connections as shown below. In addition, check
the output current.
ISO.DCV (15 V)
Inside the 3174
ISO.DCV (15 V)
External I/O
output terminal
ISO.COM
Relay
• A signal can absorb up to 100 mA.
• If the current capacity is not sufficient, connect a transistor or the like to the
outside in order to amplify the current.
• When connecting an inductive load such as a relay, connect the diode in paral-
lel with the coil.
ISO.DCV (15 V)
Inside the 3174
ISO.DCV (15 V)
External I/O
output terminal
ISO.COM
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