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(a) Outline of digital signal input circuit
Both 24V common and 0V common connections are allowed in the digital signal input circuit.
Follow the wiring diagram below for each type.
Input circuit
24V common
CG31/CG33/CG35
(Machine side)
External contact
Input voltage
Stabilized
power supply
24VDC(+)
0V
A3,B3
FG
Input conditions
The input signals must be used within the following condition ranges.
1
Input voltage at external contact ON
2
Input current at external contact ON
3
Input voltage at external contact OFF
4
Input current at external contact OFF
5
Input resistance
6
Tolerable chattering time (T1)
7
Input signal holding time (T2)
input circuit operation delay time
8
(T3 and T4)
9
Machine side contact capacity
(Note)
Input signal holding time: The guide is 40ms or more. The input signal will not be
recognized unless it is held for the ladder processing cycle time or longer.
Connection to 24V common input
(E)
T1
+24V
GND
(I)
T3
(E) : External signal, (I):Internal signal
Input resistor
R
3.3 k
Control
circuit
COM
20V or more, 25.2V or less
T2
T1
T4
E70 Series Connection Manual
2.5 Operation Panel I/O Unit
0V common
CG31/CG33/CG35
(Machine side)
Input resistor
External contact
Input voltage
Stabilized
power supply
24VDC(+)
COM
0V
A3,B3
FG
24V common
6V or less
18V or more, 25.2V or less
9mA or more
2mA or less
Approx. 3.3kΩ
3ms
40ms or more (Note)
3 to 16ms
30V or more, 16mA or more
Connection to 0V common input
T2
(E)
T1
+24V
GND
(I)
T3
R
3.3k
Control
circuit
0V common
4V or less
T1
T4
29
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