Hi, I want to build a PLC using an 89S92. I want to write PLC programs in Ladder diagrams so I tought of creating a program using C#, which would allow me build my ladder programm and send the ladder program to the micro via RS 232. Then I thought of creating a program in C for the 89S52 so that the C# will assign a number of bits (lets say 8 bits) and when these bit as received by the micro, the C programm will interpret those 8 bits as for exmple:

10011011

- the first bit means that P0.0 will be used as input
- the second bit means that P0.1 will not the used as input
- the third bit means that P0.2 will not the used as input
- the fouth bit means that P0.4 will be used as input
- the fifth bit means the P0.0 and P0.4 will be added together so to form and OR Gate logic
- the fifth bit means that the product of the inputs will be shown on P1.1

I'm not sure if this is the correct way for starting a project like this one but I'm really having trouble in designing a program that will let me draw ladder diagrams and make the micro understand them.

I would really appreciate some help :)