Jamie_PLC (Customer) asked a question.

November 30, 2020 at 3:00 PM
Hi,

I'm new to PLC coding and was confused by how internal relays work. I would appreciate any help you could give me.

For example I understand that:

  • Internal relays work by assigning a C Bit to either a NO or NC.
  • That power passes through a NC but not a NO unless turned on.
  • X and Y input and outputs

However, when a NC or NO are assigned a C Bit at the start of a rung how do they get activated without the need of a physical switch?

 

 

  • 5 answers
  • 397 views

  • AkaHammer (Customer)

    You have to use a coil for the "C" Bit when you turn coil on "C" Bit turns on. Coils go at the right side of the rung, rung logic turns on coil, then the bit will turn on.

  • AkaHammer (Customer)

    you probably should find some good instruction try ACC Automation web site

  • Jamie_PLC (Customer)

    Thanks, if I assign two C Bits to a NO and then a NC, would the NO first be energized followed by the NC?

  • Todd Dice (Customer)

    C bits are internal relays as they are not directly linked to a physical output of the PLC. Contacts (NO, NC) of them are used to power other logic.

     

     

 

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