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
PLC architecture form and characteristics
1. Unit typeUnit features compact structure. All of the circuits it will load a module, form a whole, small size, low cost, easy to install.FX2 series programmable controllers, extended by the basic unit cell four kinds of special adapters, extensions and product composition. Only the basic unit or combine these products to use can be.Basic … Continue reading PLC architecture form and characteristics
Input to the PLC the main cause of an error signal and actuator
Industrial control computer and programmable controller itself has a high degree of reliability, but if an error occurs the switch signal input to the PLC, analog signals deviate, PLC outputs control of actuators are not required, these may make the process go wrong, causing irreparable economic loss.Affect the signal input to the PLC error the … Continue reading Input to the PLC the main cause of an error signal and actuator
Method of FX PLC password crack
If you have a source, you just apply the PLC memory total elimination. Removal methods are as follows:1. If you are using a handheld programming writerWhen a writer connected with the PLC after selecting ONLINE mode, press GO 鍵 screen you will be asked to enter the password, your SP 鍵 8 times, then press … Continue reading Method of FX PLC password crack
PLC input/output response lag and its effect analysis
When PLC inputs the input signal changes PLC output reacts to the input changes will take some time, a phenomenon called the PLC input/output response lag.From the above analysis, scanning cycle length depends on the length of the program. Scan cycle is longer, respond more slowly. As each scan cycle is only one I/O refresh, … Continue reading PLC input/output response lag and its effect analysis
PLC crashes of software or hardware that causes
Programmable logic controller PLC runtime panic condition may occur, which result in an estimated loss of industrial production, therefore, first of all to know the causes of panic PLC, for troubleshooting the cause, a software or hardware error may cause the PLC to panic, introduced below: 1, hardware (1) I/O tracking, PLC I/O error is detected automatically, … Continue reading PLC crashes of software or hardware that causes
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