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7. Product Specification
CNT24-2(USB)GY
61
External Input and Output Circuit
Input section
Figure 7.4.
Isolated Input Circuit and an Example of a
Connection
The signal input section consists of an Optocoupler isolated input (compatible with
current sink output). Therefore, driving the input section for the module requires an
external power supply.
When an external power supply other than 5V is used, insert a current-limiting resistor
at position R. If PV denotes an external power supply, the current-limiting resistor R
can be calculated as follows:
For example, P = 12V will require the following resistance:
350
Ω
< R < 470
Ω
.
In addition, the general-purpose input signal also has a similar circuit configuration.
P-5
20
P-5
15
Rk
Ω
<
<
Module
External circuit
Optocoupler
Optocoupler
220
Ω
220
Ω
400
Ω
Input
pin
Input
pin
External device
signal output
Plus common
+12V
External device
signal output
R
Plus common
+5V
Summary of Contents for CNT24-2GY
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