plc program
Passwords can limit set PLC programming tool, display module, interface to read and write procedures, monitoring, change the current values, and so on, to protect programs or restrict the operator's procedures for monitoring purposes.Mitsubishi FX series PLC password set way: will PLC power, and through programming cable and computer connection, in programming software GX-DEVELOPER in … Continue reading Mitsubishi PLC password settings
ORB (circuit or) series circuits connected in parallel directivesIntroductions:(1) more than 2 contacts connected in series circuit series circuit. Series circuits connected in parallel connection, the branch started with LD and LDI instruction, the ends of the branches with the ORB directives.(2) the ORB directives ANB instruction is available with the latter operating units of … Continue reading PLC series circuits connected in parallel (ORB) Instructions Example
According to the functional flowchart, to step in as the core, from the start step by step by step design until completion. The key to this method is a diagram drawing function. First State of the output is used to control the work process consists of several steps, conversion between the step and pointed out … Continue reading PLC flow chart of sequential control design method
Ladder diagram relay diagram in the structure, element symbols and logic control functions are similar, but they also have many differences, ladder diagram programming has its own rules.1) each logical line always begins with a bus left, then contact connection, finally ending in the coil or the right bus (bus could not draw on the … Continue reading Rules of PLC ladder diagram programming
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
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
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 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
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
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
PLC ONE 