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
Today, I will share with you the content about PLC, giving you a simple introduction to PLC. I will briefly introduce the following five points. 1. First, let’s talk about what a control system and a controller are. Whether in the industrial field or in real life, such as air conditioners, humidifiers, refrigerators, elevators, or … Read more
Search on WeChat Technical Training Did you know that any complex engineering application consists of several basic programming steps? Therefore, we must master the basic programming steps and some typical basic control designs. Today’s article introduces the most basic controls of the PLC control system, including initialization control, fault control, output prohibition control upon power … Read more
Search WeChat Jicheng Training Common input devices for PLCs include buttons, limit switches, proximity switches, toggle switches, dip switches, and various sensors, while output devices include relays, contactors, and solenoid valves. Correctly connecting the input and output circuits is a prerequisite for ensuring the safe and reliable operation of the PLC. 1 Connecting PLC with … Read more
Before understanding the PLC control cabinet, we need to grasp a few requirements. 01 Wiring according to the diagram is the highest principle. First, before wiring, you must carefully read the drawings and fully understand the designer’s intentions, rather than relying on personal so-called rich experience. If there are unclear or contradictory points, you should … Read more