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5.5 Digital I/O Connections
Digital I/O terminals consist of four contact output terminals (DO1 to DO4) and two voltage signal
input terminals (DI1 and DI2), and each terminal is isolated from internal circuits.
The terminal CO2 is the signal common for DO2 to DO4 and the terminal CI is the signal common for
DI1 and DI2. For details, see 10. “Function Description.”
The function of each terminal can be selected by settings.
For details, see 10. “Function Description.”
To drive an electromagnetic relay or electromagnetic counter using a digital output, connect a
surge-absorbing diode into the input circuit of the relay or the counter. Figure 5.11 shows a connection
example.
CI DI
DO2 to
DO4
DO1CO2CO1
Photo-coupler
(Option)
Solid-state contact
(Option)
Transistor open collector
(Standard)
Resistor
(Option)
Converter inside
DC power supply
24VDC
* Note 1
Surge absorbing diode
Electromagnetic counter
* Note 1 Use a surge-absorbing diode of rated current 1A and rated withstand voltage 200 V minimum.
* Note 2 In the case of standard specification (without Digital I/O), the solid-state contact, photo-coupler and
resistor are not built in. Leave DO2 to DO4, CO2, DI, DI2 and CI unconnected.
Figure 5.11 Connection Example of Electromagnetic Counter