17
2
Installation & Connection
17
In
sta
llation & Co
nn
ectio
n
Chapter
2
2-8.
External input connection
No-voltage contact input type (standard (NVI): not specified at the time of order) or DC-input type
(DCI: specified at the time of order) can be selected for external input circuit.
No-voltage contact input type (standard (NVI): not specified at the time of order)
This type inputs signals by making short-circuit and open-circuit between input terminals (A7 to
A9) and common terminal (A10). Short-circuit is performed with contacts (relays, switches and
so on) and non-contacts (transistors, TTL of open collector output and so on).
DC-input type (DCI: specified at the time of order)
This type inputs signals by applying voltage between input terminals (A7 to A9) and common
terminal (A10). Plus common connections and minus common connections are possible.
Minus common connection of no-voltage contact input type (standard: NVI)
<Equivalent circuit>
Caution
●
Prepare an external power supply for the relay drive (vext).
●
When activating AC power supply, be sure to connect it to the F325 via relay and
so on, but not directly.
●
Power supply must be within the rating (DC spec.: 30V 100mA).
Overvoltage and overcurrent cause failure.
Never load short-circuit. This will cause damage.
Caution
●
Do not apply voltage to the signal input circuit from outside.
●
An external element must be an element in which Ic=10mA or more can be applied.
●
External element leak must be 400
μ
A or below.
Input
Inside F325
Input
A7
A9
A10
+12V
Approx.
Open circuit -> OFF
Short circuit -> ON
Push
Toggle
switch
Relay
contact
TTL open collector output
(ON when IN is "H")
IN
IN
switch
common
4mA
to
