4. Structured Text (ST) Description: A high-level programming language with syntax similar to Pascal or C. Very powerful and flexible. Applicable Scenarios: Complex mathematical calculations, algorithms, data processing. Example: Analog Temperature PID Control (Simplified) Control Requirements: Read the temperature value, compare it with the set point, and output a control signal through PID computation. Character … Read more
Hongke KPA Automation softPLC The Hongke KPA Automation softPLC is a programming environment for PLCs developed for real-time operating systems such as Linux, Xenomai, INtime, and Windows, making it highly suitable for users who need to utilize IEC61131-3 and PLCopen standards for control technology and PLC programming. This article will introduce how to implement powerful … Read more
Structured Text(ST) Programming from Basics to Advanced Applications ST Language Basics and Overview Structured Text(ST) is a high-level PLC programming language that complies with the IEC 61131-3 standard. It uses a syntax similar to Pascal, making it particularly suitable for implementing complex algorithms, mathematical calculations, and data processing. The Omron NJ series PLC fully supports … Read more
01Ladder Diagram (LD) · Features: A graphical language similar to electrical relay circuit diagrams, suitable for logical control. · Application Scenarios: Switch logic familiar to traditional electrical engineers (e.g., motor start/stop, interlocking control). 02Instruction List (IL) · Features: A low-level text language similar to assembly, consisting of operation codes and operands. · Application Scenarios: Small … Read more
FX5U: Beginner’s Guide to Mitsubishi PLC and Practical Modbus Communication Imagine you have just taken over an automation renovation project, with five frequency converters standing like silent soldiers waiting for orders. An operator points to the flashing screen in the control room and asks, “Can the data from these devices be displayed in real-time?” Don’t … Read more
Click the blue text to follow! Rapid Troubleshooting Practices of Structured Text in IoT Applications 1 The Truth Behind the Fault Last Tuesday, Xiao Zhang rushed over to me, saying: “Master Li, the data acquisition system on production line 3 has malfunctioned again, and the monitoring center can’t see the temperature data. Production is about … Read more
In the previous issue, we discussed the programming applications of two languages: PLC Programming Languages: Ladder Diagram (LD) vs. Structured Text (ST) According to the voting results over the past month, it is clear that Ladder Diagram LD still occupies the largest share, followed by Structured Text ST. The specific data is shown in the … Read more
In PLC programming, there are various flow control structures used to organize code, implement logical functions, and decision-making processes. When using ST (Structured Text), a programming language defined by the IEC 61131-3 standard, we can utilize control structures similar to those in high-level programming languages. Below are some commonly used flow control structures in ST … Read more
Search on WeChatTechnical Training The programming languages for PLCs have distinct characteristics compared to general computer languages; they are neither high-level languages nor typical assembly languages, and they must meet the requirements of being easy to write and debug. Early PLCs only supported Ladder Diagram (LD) and Instruction List (IL) programming languages. Currently, the International … Read more
Currently, there are 5 standard programming languages for PLCs, including graphical programming languages and textual programming languages. Graphical programming languages include: Ladder Diagram (LD); Function Block Diagram (FBD); Sequential Function Chart (SFC). Textual programming languages include: Instruction List (IL) & Structured Text (ST). The programming languages of IEC 1131-3 were formed based on the reasonable … Read more