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A1SJ71AR21 Melsecnet interface module
MITSUBISHI A1SJ71AR21 Manual And Instructions
A1SJ71AR21 datasheetPDF datasheet

MITSUBISHI A1SJ71AR21 Product information and technical parameters:
Brand: MITSUBISHI
Name: Melsecnet interface module
Model: A1SJ71AR21
PLC station distance: 500M.
Cable type: coaxial cable.
The function of the MELSECNET interface module is to connect the main CPU PLC to the MELSECNET data communication system.
As long as the switch on the component to set,
Can determine the CPU PLC is as the main station or in situ station.
There are two modules available for selection: one is the connection of the optical cable network and the network of the coaxial cable.
For a ANSCPU, up to only a piece of interface components can be inserted, A2ASCPU can be inserted 2.
The popularization and application of PLC programming has been developed rapidly in our country,
It has been widely used in all kinds of mechanical equipment and production process of electrical control devices,
All walks of life have emerged a large number of application of PLC transformation of the results of the equipment.
Understand the working principle of PLC, have the ability to design, debug and maintain the PLC control system,
Has become the basic requirements of modern industry for electrical technicians and engineering students.
The instruction list programming language is a programming language similar to assembly language mnemonic,
As well as assembly language by the operation code and the number of operations.
In the case of the computer for the PLC handheld programmer compile user program.
At the same time, the programming language of the instruction list corresponds to the ladder diagram programming language,
In PLC programming software can be converted to each other. Figure 3 is the instruction sheet corresponding to the ladder diagram of figure 2PLC.
The characteristics of instruction table programming language is used to represent mnemonic operation function,
Easy to remember, easy to grasp;
In the handheld programmer on the keyboard using the mnemonic representation, easy to operate, can be programmed in computer;
There is a one-to-one correspondence between the ladder diagram and the ladder diagram. Its characteristics are basically consistent with the ladder diagram language.

Signal transmission device B/NET interface device for power distribution control equipment
The response time of PLC is the interval between the time of the change of the external output signal of the PLC and the time of the change of the external output signal which is controlled by it,
Lag time, this is the time constant of the input circuit,
The time constant of the output circuit, the arrangement of the user statement and the use of the instruction,
The cycle scan mode of PLC and the way of PLC to refresh the I/O and so on A1SJ71AR21 A1SJ71AR21
This phenomenon is called the I/O delay time effect.
Input status and input information input from the input interface,
CPU will be stored in the working data memory or in the input image register A1SJ71AR21.
And then combine the data and the program with CPU.
The result is stored in the output image register or the working data memory,
And then output to the output interface, control the external drive. A1SCPUC24-R2 integrates all functions of A1SCPU with a dedicated RS232 interface,
It maintains the compatibility of CPU ANS and is easy to use.
The built-in RS232 interface makes it can connect bar code reader, operator interface, computer and so on,
Realization of low cost data communication A1SJ71AR21.
A1SCPUC24-R2 is a combination of A1SCPU and A1SJ71C24-R2 features of the two components together.
It maintains the compatibility and communication specifications for the two component programming.
Fixed this A1SCPU and A1SJ71C24-R2 programming method applied to A1SCPUC24-R2. SRAM memory card.
RAM capacity: 128KB. I/O slots: 2 slots.
Outline dimension: 220*130.
CPU basic board can be plugged into 1 power modules,
1 CPU components and a maximum of 2, 3, 5, or 8 single slot size special function components and I/O components are respectively inserted and arranged.
The expansion port are arranged on the basic substrate on both sides, for connecting board for expansion.
Up to 3 extension substrates. 2 channels.
200/10kpps.
Count input signal: DC5/12/24V.
External input: DC5/12/24V.
Compare output: transistor DC12/24V, 0.5A/1 point, 2A/1 common.
20 point terminal station.
Structured text language is a programming language that describes a program with a structured description of the text.
It is a programming language similar to a high level language. In large and medium
Structured text is often used to describe the relationship between the various variables in the control system based on the PLC system.
Mainly used for other programming languages more difficult to achieve the user program.
Sequential function flow chart language is designed to satisfy the sequential logic control.
The process of sequential process action is divided into steps and transformation conditions,
According to the transfer condition, the control system is distributed in the function flow sequence,
Step by step according to the sequence of actions.
Each step represents a control function, represented by the box.
In the box, the ladder logic is used to complete the task of the corresponding control function.
This programming language makes the program structure clear and easy to read and maintain,
Greatly reduce the programming workload, shorten the programming and debugging time.
Used in the system of the size of the school, procedures for more complex occasions.
Sequence function flow chart programming language features: to function as the main line, in accordance with the functionaal flow of the order of distribution, clear, easy to understand the user program,
Avoid the defect of ladder diagram or other languages,
At the same time, the use of ladder language to avoid the use of ladder programming,
Due to the compllicated mechanical interlock, the structure of the user program is complex and difficult to understand,
User program scan time is also greatly reduced A1SJ71AR21 A1SJ71AR21.


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