Composition of the PLCIn terms of structure, PLC is divided into fixed and modular (modular) two. Fixed type PLC including the CPU board, I/O Board, display panel, a block of memory, power supply, these elements combine into a whole that is not removable. Modular PLC including CPU module, I/O modules, memory, power supply module, backplane, … Continue reading Composition of the PLC configuration, CPU, I/O modules, power modules

PLC including I/O points and user storage capacity the capacity of two aspects.Amount of storage capacity that is required by the user program is not only associated with the functions of the PLC system, but also with the capabilities of the program level. An experienced programmer and a beginner, when completing the same complex functions, … Continue reading PLC capacity formula

Differences from the basic structure of the DCS and PLC, DCS distributed control system of English (TOTALDISTRIBUTED CONTROL SYSTEM) for short. Refers to the control of dispersed risk, manage and display set. Late 60 programmable controller was developed as a logical operation (Programmable Logic Controller). Referred to as PLC. Mainly used in the automotive industry. … Continue reading Difference between DCS control system and PLC control system

A, operating environment to ensureSince the PLC for precision electronic products, automation and control system requires long uninterrupted run, thus PLC environment demanding, dust-proof, fireproof, waterproof, heat, lightning, electrical control room general arrangements have double glazing, install water cooling air-conditioning on the second floor, electronic room temperature control in 28 degrees; Dust is the PLC … Continue reading PLC maintenance essentials and fault analysis

Instruction is the PLC to be told what to do, and how to do code or symbol. Text and graphic symbols usually two.Writing code for commonly used mnemonic form, known as the PLC statement table of instructions. It is similar to a computer's Assembly language, Ruby's initials and the number represents the corresponding directive.Graphical symbols … Continue reading Instruction of PLC concepts

In order to State, it is necessary to learn more about ladder diagram of common terminology.(1) the ladder diagramLadder diagram of PLC program is a simple and easy to understand form. It comes from electrical schematic diagram of relay control systems, programming in schematic form the logical process of the directive, it is sometimes also … Continue reading Basic terms of PLC concepts