Help in PLC Program

Check the manuals and examples on the internet and do some studying?

Duplicate thread.

I am not familiar with ABB PLCs or their programming environment, so I can't help you there. However, I think what you are struggling with is where to begin with the specific problem that you have been assigned. This is how I would approach the problem, regardless of what PLC system I am using:

1. Identify the discreet inputs and outputs that you require and assign them addresses in the processor using tag names.
2. Identify the analog inputs that you require and assign them tag names or addresses and convert the values (0-10 volts) to meaningful engineering units, for example x volts=y liters
3. Now develop your logic. A simple flow chart is a good way to start.
4. Using your processor's instruction set, Convert your logic diagram to specific instructions.

I think my biggest problem , is to write instruction for the following condition:

· T_1 Level <T_2 Level active condition on the first output

· T_1 Level >T_2 Level active condition on the Second output

· T_1 Level =T_2 Level active condition on the Third output

Can someone please help me on how to write a program irrespective of software which one is using to fullfill above condition . That is all that need the rest I will do it my self.

i.e how does one write those instruction or program the instruction so that when I run the program ,it will fulfill the above condition .

if sensor t1 is less than sensor t2 I want the result on output 1

if sensor t1 is greater than sensor t2 I want the result on output 2

if sensor t1 is uqual to t2 I want the result on output 3

I need the above instruction on a plc language ,any language.

These are basic PLC programming.

Try to check some documentation

http://www.wago.com/wagoweb/documentation/759/eng_manu/333/m07590333_00000000_1en.pdf

The problem seems simple enough but I don't work with ABB plcs so I can't help you with the exact programming. Besides, the problem seems too simple to be a real problem in a factory. It's homework, right?

Also, in the real world, T1=T2 will be ON for only a split second due to noise or turbulence in the levels. Your output no. 3 will be flickering like a candle when the two levels are close enough.

regards,

Vulcan