5 commonly used PLC programming languages, which one is the best for PLC programming?
5 commonly used PLC programming languages, which one is the best for PLC programming?
Introduction:
To become a qualified PLC programmer, you need to be proficient in writing logic in any of the major PLC programming languages so that you can choose the best language for a specific application. There are five commonly used PLC programming languages, namely ladder diagram language (LD), structured text language (ST), sequential function flow chart language (SFC), function block diagram language (FBD) and instruction list language (IL). The following is a detailed introduction to which language is best for PLC programming:
1. Ladder diagram language (LD):
Ladder diagram language is the first programming language used by PLC and is also the most commonly used programming language for PLC. It evolved from the schematic diagram of the relay control system. The system is similar, but there are certain differences in the use of symbols and expressions. This is a programming language based on the electrical relay control circuit diagram, which is easy to understand and debug. Suitable for simple logic control and sequential control.
2. Structured Text Language (ST):
Structured text language is a high-level text language that can be used to describe the behavior of functions, function blocks and programs, and can also describe the behavior of steps, actions and transitions in sequential function flow charts.
3. Sequential Function Flowchart Language (SFC):
Sequential function flow chart, also known as flow chart or state transition chart, is a graphical functional description language.
4. Function Block Diagram Language (FBD):
Function block diagram language uses graphic symbols similar to digital logic gate circuits, with intuitive logic and easy to use.
5. Instruction List Language (IL):
Instruction list programming language is similar to mnemonic assembly language in computers. It is the most basic programming language for programmable controllers. In general, no PLC programming language is absolutely "best suited" because each language has its own advantages and disadvantages. Choosing which programming language is best suited depends on your specific needs and preferences. If you want programming to be more intuitive and easy to understand, then ladder diagram language may be the best choice; if you prefer to describe program behavior in text, structured text language may be more suitable for you; If you need to describe complex functions or logic, then function block diagram language may be more advantageous; if you need to describe the execution order or flow of the program, then sequential function flow chart language may be more suitable; If you need to write low-level control logic or instructions, then instruction list language may be more suitable. Therefore, when choosing a PLC programming language, it is recommended that you weigh and choose according to your needs and preferences. Best price of New Factory Sealed Surplus Allen Bradley Modules at https://www.plc-hub.com Read the full article
