PLC-LADDER LOGIC Examples-PIC16F877

Lets start programming with our own PLC using open source ladder logic LDMicro.

Thanks to  LDMicro. developer .

Here i used PIC16F877 Microcontroller

16.000000 MHz crystal

Digital input and output

1) 40th(RBO ) pin in Microcontroller will be high when a digital high is given at pin 33( RB0)

LADDER DIAGRAM:

    XRBO             YRB7       

1 ||-------] [--------------( )-------||

  ||                                  ||

  ||                                  ||

  ||                                  ||

  ||------[END]-----------------------||

  ||                                  ||

  ||                                  ||

I/O ASSIGNMENT:

 Name                       | Type               | Pin

----------------------------+--------------------+------

 XRBO                       | digital in         | 33

 YRB7                       | digital out        | 40

2) Input negated digital switch( 40th(RBO ) pin in Microcontroller will be high when a digital low is given at pin 33( RB0))

   ||      XRB0             YRB7       ||

 1 ||-------]/[--------------( )-------||

   ||                                  ||

   ||                                  ||

   ||                                  ||

   ||------[END]-----------------------||

   ||                                  ||

I/O ASSIGNMENT:

  Name                       | Type               | Pin

 ----------------------------+--------------------+------

  XRB0                       | digital in         | 33

  YRB7                       | digital out        | 40

Other examples coming soon