Traditional analog control system using electric instrument, common DDZ-and DDZ-type ⅱ-ⅲ instrument. The characteristics of simple structure, low price, great size, great power, installation complexity, generality and flexibility, accuracy and stability. In addition, its control functions are simple, complex process control cannot be achieved. With the development of technology and new process control computers emerging … Continue reading PLC compared with other analog devices
Category: plc program
FX2N-48MR PLC I/O distribution
PLC I/O wiring diagrams, selection of FX2N-48MR PLC, there are 18 input devices output device and 5 respectively, occupy 18 inputs of the PLC output and 5 points, invites the reader to consider whether the fourth section of this chapter describes the method can be used to reduce the amount of PLC I/O points. In … Continue reading FX2N-48MR PLC I/O distribution
How to reduce PLC outputs
PLC in practical applications often run into two problems: one is the PLC I/O points is not enough and needs to be expanded, however increased I/O points will increase costs; second, the PLC has selected an Extensible I/O points are limited and cannot be increased. Therefore, on the premise of meet the system requirements, the … Continue reading How to reduce PLC outputs
How to reduce PLC input points
PLC in practical applications often run into two problems: one is the PLC I/O points is not enough and needs to be expanded, however increased I/O points will increase costs; second, the PLC has selected an Extensible I/O points are limited and cannot be increased. Therefore, on the premise of meet the system requirements, the … Continue reading How to reduce PLC input points
Structure design of PLC control system
Linear programming Division of programming and structured programming (industrial mixing system).Objects that are mixing requirements are as follows:1. When component a (b) pump when required: 1) components of a (b) inlet valve has been opened, discharging valve is open; 2) mixing bucket is not full, the mixing valve closed; 3) the pump drive motor failure, … Continue reading Structure design of PLC control system
PLC control system design methods
Application system design 1. PLC control system typeF composed of PLC control system.F-centralized control system made of PLC.F composed of PLC distributed control system.F with PLC remote I/0 control system. 2. System operation modeF manual operation mode.F semi-automatic operation.F automatic operating mode. B system hardware design under 1. Technological requirements2. Equipment status3. Control function4. I/0 number and type5. Advanced … Continue reading PLC control system design methods
PLC power supply module selection procedures and principles and other peripherals
1. Selection of power supply modulePower supply modules option only for modular structured PLC, PLC power supply does not exist for the selection.Selection of main power supply the power supply module and power input voltage rated output current. The rated output current of the power supply modules must be greater than the CPU module, I/O … Continue reading PLC power supply module selection procedures and principles and other peripherals
PLC I/O module selection steps
General prices accounted for more than half the price of PLC I/O modules. PLC I/O modules switch I/O module, analog I/O modules and special function modules. Different I/O modules, the circuit and function is different and directly affect the price of the application of PLC and should be selected according to the actual need.(A) the … Continue reading PLC I/O module selection steps
PLC selection steps and principles of capacity
PLC including I/O points and user storage capacity the capacity of two aspects.(A) Selection of I/O pointsPLC I/O points average prices are still relatively high, so the number of reasonable selection of PLC I/O points, to meet control requirements and strive to use the minimum number of I/O points, but you must have a certain … Continue reading PLC selection steps and principles of capacity
PLC type selection procedures and principles
With the development of PLC, PLC product range is also increasing. Different types of PLC, its structure, performance, capacity, instruction set, programming methods, prices are also different, also have focused on appropriate occasions. Therefore, the rational use of PLC, is important for improving PLC control system for technical and economic indicators of significance.PLC selection from … Continue reading PLC type selection procedures and principles
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