1. Classification by structureAccording to the PLC's structure, PLC can be divided into two types of monolithic and modular.(1) integrated PLC-PLC as a whole is the power supply, CPU, I/O interfaces and other components are collected in a single chassis, has the characteristic of compact structure, small size, low price. Small PLC uses this monolithic … Continue reading Classification of PLC
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Introduction to PLC programming
Early programmable logic controller referred to as programmable logic controllers (Programmable Logic Controller,PLC), it is mainly used to replace relay logic control. With the development of technology, which uses microcomputer technology of industrial control equipment is already far exceeds the scope of logic control, therefore, such devices are called programmable controller, referred to as PC. … Continue reading Introduction to PLC programming
PLC, the structure and principles of learning
Programmable controllers (Programmable Controller) should be referred to as PC, PC PC in order to distinguish, so referred to as programmable controller PLC (Programmable Logic Controller), but does not mean that PLC can control logic signal. Application and design of PLC is specifically designed for industrial environments, comes with an intuitive, simple and easy to … Continue reading PLC, the structure and principles of learning
How to improve the speed of PLC program running
1: according to actual needs, function block programming, writing subroutinesIn the PLC, subroutines are relatively independent of a specific control objective to develop the program. CALL subroutine call instruction is executed, if the subroutine call if the conditions are not met, the program scans only in the main program, and not to scan the routine, … Continue reading How to improve the speed of PLC program running
Output value of the analog input module in the normal reasons for beating with 32767
Question: I use two 1KF02 analog input module, provided separately for modules 1 and 2. Module configuration:Module 1, the first four-channel configuration for current signals, four channel configuration for RTD Pt100; first six channel module 2 configuration for RTD Pt100, two vacant channel, STEP7 will disable it. Current signals by two-wire connection, PT100 wire connection, … Continue reading Output value of the analog input module in the normal reasons for beating with 32767
What is DCS control system
DCS distributed control systems (Distributed Control System), short for domestic General called the distributed control system. It is a process control level and process monitoring levels of communication networks-a link to the multiple computer systems, integrated computer (Computer), communications (Communication), display (CRT) and a control (Control) 4 c technology, the basic idea is decentralized, centralized … Continue reading What is DCS control system
Analog conversion between values and the value of quantities
1, converts analog values into the values of quantities:Parameter conversion:OUT = [((FLOAT (IN) – K1)/ (K2–K1)) * (HI_LIM–LO_LIM)] + LO_LINote:If user input/output type dual-polarity (± 10V, 5V), K1=-27648,K2=27648, or K1=0,K2=27648.For example: suppose the analog module the sensor type 0-20mA to measure object temperature, when temperature is 0 c current 0 mA, when temperature is 100 … Continue reading Analog conversion between values and the value of quantities
Five stage of the learn PLC
I personally think that the PLC will go through 5 stages. Read the content below, please ask yourself is which form!I. logical phasesCalled the logical phase is to implement the General logic of relay system design, since it is a relay system of electric drive knowledge is the basis for the stage. My personal summary … Continue reading Five stage of the learn PLC
Analog conversion method
1, basic conceptsWe are living in a material world. All substances contain chemical and physical properties, we are the apparent nature of the material to understand and own property of matter and motion characteristics. These apparent nature is what we used to say mass, temperature, velocity, pressure, voltage, current, the physical quantities expressed in mathematical … Continue reading Analog conversion method
PLC battery replacement when the best
When PLC program to keep in RAM when used batteries, the battery usually 3V or 3.6V non-rechargeable lithium-ion battery, battery life is usually about five years or so, the battery is used for a long time, the voltage will drop, when it dropped to less than to ensure that the data in RAM, the program … Continue reading PLC battery replacement when the best
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