Spec., Input/output and layout
2-4. DC Input Signal’s Disposal(AC Power Type)
z Input terminal
When connect input terminal and COM terminal with contacts without voltage or
NPN open collector transistor, if input is ON，LED lamp lights, which indicates input。
There are many COM terminals to connect in PLC.
z Input circuit
Use optical coupling instrument to insulate the input once circuit and twice circuit，
There’s a C-R filter in the twice circuit。It is set to avoid wrong operation caused by
vibration of input contacts or noise along with input signal. As the preceding reason, for
the changing of input ON→OFF，OFF→ON，in PLC, the response time delays about
10ms。There’s a digital filter inside X000~X015。This kind of filter can very from
0~15ms according to the special register (D8020).
z Input sensitive
The PLC’s input current is DC24V 7mA，but to be safe，it needs current up to 3.5mA
when it’s ON，lower than 1.5mA when it’s OFF.
DC input signal
24
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