MITSUBISHI A1SY22 datasheet PDF catalog A1SY22 PDF datasheet

Input unit (upper / lower limit LS signal) (NSD servo system)
Each scanning process. Focus on the input signal sampling. Focus on the output signal to refresh.
Input refresh process. When the input port is closed,
Program in the implementation phase, the input end of a new state, the new state can not be read A1SY22 datasheet PDF catalog A1SY22 PDF datasheet.
Only when the program is scanned, the new state is read A1SY22
A scan cycle is divided into the input sample, the program execution, the output refresh.
The contents of the component image register are changed with the change of the execution of the program.
The length of the scan cycle is determined by the three.
CPU the speed of executing instructions.
Time of instruction.
Instruction count A1SY22 datasheet PDF catalog A1SY22 PDF datasheet.
Due to the adoption of centralized sampling.
Centralized output mode.
There exist input / output hysteresis phenomena, i.e., the input / output response delay.
PLC selection with the development of PLC technology, more and more types of PLC products,
Function is becoming more and more perfect, and its application is more and more extensive.
Different series of different models of PLC has different performance, applicable occasions also have different emphasis,
Price also has a greater difference A1SY22 datasheet PDF catalog A1SY22 PDF datasheet. Therefore PLC selection,
Under the premise of meeting the control requirements,
Should consider the best performance to price ratio, a reasonable choice of PLC.
System program memory for storing system program,
Including management procedures, monitoring procedures, as well as the user program to do the compiler to compile the process of interpretation.
Read only memory. Manufacturers use, content can not be changed, power does not disappear. For common cathode input module (2 line type).Three remote components can be connected to the CC-LINK system.
Remote I/O: refers to the field components that require only ON/OFF control,
Such as digital I/O or pneumatic valve, etc..
In this type of communication can only be carried out in the bit data.
Remote components: the field components that require processing of register data,
For example analog I/O and counter, etc..
In this type of component, in addition to the bit data can be carried out in the register data communication.
Intelligent remote: this type of element refers to the actions that allow the master station or other station to access,
To collect data and control the local PLC station,
GOTS and programmer interface unit are of this type.
PLC is the use of " sequential scanning, and constantly circulating " way to work.
That is, in the operation of CPU, PLC according to the user according to the control requirements of the coexistence of the user in the memory of the program,
According to the instruction sequence number (or address number) for periodic cyclic scan, such as no jump instruction,
From the first instruction to the user program execution sequence one by one, until the end of the program,
And then return to the first command, start the next round of the new scan, in the process of each scan,
Also complete the sampling of the input signal and the output status of the refresh and other work.
PLC is the use of " sequential scanning, and constantly circulating " way to work.
That is, in the operation of CPU, PLC according to the user according to the control requirements of the coexistence of the user in the memory of the program,
According to the instruction sequence number (or address number) for periodic cyclicc scan, such as no jump instruction,
From the first instruction to the user program execution sequence one by one, until the end of the program,
And then return to the first command, start the next rround of the new scan, in the process of each scan,
Also complete the sampling of the input signal and the output status of the refresh and other work A1SY22 datasheet PDF catalog A1SY22 PDF datasheet A1SY22 datasheet PDF catalog A1SY22 PDF datasheet.