Statement list programming is not necessary. There are other languages.
But STL is very easy to use and can be written in multiple or single step.
It can be powerfull meaning complex or simple
Parallel or multitasking can be done.
It is more easier to use than LDR and easier to understand.
A PLC programm is basically a correlation between inputs and outputs, you can program this in one or a combination of the following languages: Ladder logic Statement list Function blocks However to communicate with the PLC you'll need an specific software provided by the manufacturer i.e. Step 7 for Siemens or RSLogix for AB
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There are many places you can learn about PLC programs or training. One place to look would be your local university or community college they can guide you to picking the right one.
Off-line programming: allows development and modification of programs without having to be connected to the PLC processor On-line programming: ability to create and modify and monitor program sequences and data while the PLC processor is on-line and in the RUN mode
When choosing a PLC for an application you have to look at the specifications of the model. There are a wide variety of specifications under one model type. Some have built in timers others don't. I/O inputs and outputs can operate on different voltages. Make a list of the operations that you would like the PLC to do and call the sales representative of the PLC company that you choose. They are very good at what they do and they will tell you which of their units will be able to fulfill the actions that you want the PLC to control.
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PLC Scan Time means plc requires some operating cycle to Plc input verification,Plc output updates and Execution of program.
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