1.5.4 I/O device corresponding description
Input (X), output (Y)
The input terminal is the port through which the PLC receives external switch signals. There are countless
normally open and normally closed contacts that can be used indefinitely, but the input terminal cannot be
driven by a program. The address number is coded in octal.
The output terminal is the port through which the PLC sends signals to the outside. It also has countless
normally open and normally closed contacts, which can be used for unlimited times. The address number is
coded in octal.
SA3 Built-in PLC terminal
Input terminal
Note: When the HDI terminal is used as an embedded PLC input terminal, the value of P.550 cannot be 41,
54, 57, otherwise the HDI will be abnormal when used as an input terminal.
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