Help with INC function of PLC Mitsubishi

[fergieomki]

I'm using INC function with D0 register. But the result after i press the switch is not D0+1 it is a random number(usually hundred or thousand after i press the switch) everytime i press the switch. The problem only occurs when i do with FX3U but if i use GX simulator the result is very good (1 2 3 4 5... after every pressed). I also try with ADD function but still the same.
P/s:'m very appreciate any comment and sorry for my bad english.

 

[tarik1978]

I don't have experience for mistubishi plc but I think you should put ONS ( one shot ) after your input so the INC instruction execute one scan only
Hope this help

 

[Ronnie Sullivan]

That's right. Use INCP.

 

[nehpets]

Alternatively you could change your input to --|P|--

Steve