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Learn about PLC programming algorithms in one article
PLC programming algorithm (1)
There are only three quantities in PLC: switch quantity, analog quantity and pulse quantity. As long as you understand the relationship between the three, you can master PLC skillfully.
1. Switch quantity is also called logic quantity, which means it has only two values, 0 or
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Introduction to Graph Programming of PLC Sequential Control Method
1. Continuation
As mentioned above, there are three common methods of sequential control, namely SCL instruction case...of, Siemens' own Graph, and sequential control by transmitting step numbers. Today we will introduce the second common method of sequential control, Graph programming.
1.1 Case Overview
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PLC field example electrical schematic diagram explanation
Reduced Voltage Starting Control of Three-phase Asynchronous Motor
1. Y-△ step-down starting control of three-phase asynchronous motor
The relay contactor control of the Y-△ step-down starting of the three-phase asynchronous motor is transformed into a PLC control system.
(1) Determine the I/O signal
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About the Standard Writing of Siemens PLC Program
1. Unified program structure
OB1: main program;
OB100: Initialization program (no need to call the main program);
OB35: 100ms (modifiable) interrupt (no need to call the main program), can call the PID module;
OB80, OB82, OB85, OB86, OB87, OB121, OB122: fault diagnosis module (no need to call the
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Brief Analysis on Ensuring Reliability of DCS Power Supply System in Thermal Power Plant
1 Introduction
With the advancement of modern control technology and the development of industrial production, DCS systems have been widely used, and a corresponding
power supply
system is needed to support the safe and reliable operation of this large network. The requirements for power qual
[Power Management]
SIMATIC S7-1500 PLC ladder diagram programming example
Electrical Engineering Knowledge—SIMATIC S7-1500PLC Ladder Diagram Programming (2)
A stepper motor is an actuator that converts an electrical pulse signal into the rotation angle of the motor. When the stepper driver receives a pulse, it drives the stepper motor to rotate a fixed angle (called the step angle)
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About PLC programming applications and diagnosis
1. Electrical knowledge
Which skill is the most basic and important for electrical engineers? In addition to electrical engineering knowledge, there is nothing else. Many people who have engineering experience in large state-owned enterprises know that the drawings of the design institute often cannot match the
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Application of PLC in Mine Hoist Control System
0 Introduction
The successful use of devices with programmable controller (PLC) as the core in mine hoists not only reflects the basic functions of PLC and can replace complex relay control, but also realizes functions that are difficult to complete in the original electronic circuit with rich program instruct
[Industrial Control]
- Popular Resources
- Popular amplifiers
Siemens PLC Programming Technology and Application Cases (Edited by Liu Zhenquan, Wang Hanzhi, Yang Kun, etc.)
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