1. What Is PLC? The International Electrotechnical Commission (IEC) defines PLC as: A programmable logic controller is an electronic system that performs digital operations and is designed for applications in industrial environments. It uses programmable memory to store instructions for executing logic operations, sequential control, timing, counting, and arithmetic operations, and controls various types of … Read more
Search on WeChat Technical Training What PLC Programming Software is Available? 1. Omron PLC Programming Software Omron PLC programming software integrates CX-Programmer V9.5, providing comprehensive software support for Omron PLC programming, fully supporting 32/64-bit WIN8 systems, and available in multiple languages, including Simplified Chinese. It can configure networks, programmable terminals, servo systems, electronic temperature controls, … Read more
Search on WeChat Jicheng Training If you’ve had any experience with PLC programming, you’ve probably heard terms like self-locking, interlocking, and mutual locking. These are typical fundamental programming steps in PLC programming that we must master. Below, I will share several of the most classic small programs. 1. Self-Locking (Start-Stop Control) Self-locking requires a normally … Read more
Common input devices for PLCs include buttons, limit switches, proximity switches, toggle switches, dip switches, and various sensors, while output devices consist of relays, contactors, solenoid valves, etc. Correctly connecting the input and output circuits is essential for the safe and reliable operation of PLCs. 1. Connection between PLC and Main Control Devices Figure 1 … Read more
Search on WeChat Technical Training Definition of PLC A programmable logic controller (PLC) is a digital operation electronic system designed for use in industrial environments. It uses programmable memory to store instructions for performing logic operations, sequential control, timing, counting, and arithmetic operations, and controls various types of machinery or production processes through digital and … Read more
There are currently 5 standard programming languages for PLCs, including graphical 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). IEC 1131-3 programming languages are a set of international programming language standards for industrial … Read more
1. Start-Stop Control Circuit Control requirements: Press the start button (I0.0 is ON), Q0.0 is ON; Press the stop button (I0.1 is OFF), Q0.0 is OFF. The ladder diagram is shown in Figure 1. Figure 1 Start Priority 2. Interlock Control Circuit In the interlock circuit shown in Figure 2, I0.0 and I0.1 are the … Read more
1. Used for Discrete Control The ability of PLC to control discrete signals is very strong. The number of input and output points can range from a few dozen to several hundred, even thousands or tens of thousands. Because it can be networked, the number of points is almost unlimited, and it can control any … Read more
The basic working method of a PLC is to sequentially execute the user program, executing one instruction per clock cycle. There are generally two types of execution for the user program: cyclic scanning and timed scanning. The scanning process is divided into three stages: input sampling stage, program execution stage, and output refresh stage, as … Read more
1. Contact and Coil Instructions Programming Principles of PLC Ladder Diagram Language 1. The ladder diagram consists of multiple rungs, with each coil forming a rung, and each rung having multiple branches, representing a logical equation; 2. The relays, contacts, and coils in the ladder diagram are not physical; they are bits in the PLC … Read more