The main unit of the AS-i system
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 A2ACPUR21 Dedicated Instructions Manual A2ACPUR21 Programming Manual A2ACPUR21
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.
And then combine the data and the program with CPU A2ACPUR21 Dedicated Instructions Manual A2ACPUR21 Programming Manual.
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. Output points: 16 points.
Voltage: DC12/24V.
OFF leakage current: 0.1mA.
Output type: transistor output (type sink).
Response time: 2ms.
All points of independence.
38 point terminal station.
With the surge absorber.
Each scanning process A2ACPUR21 Dedicated Instructions Manual A2ACPUR21 Programming Manual. 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.
Only when the program is scanned, the new state is read.
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.
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. Therefore PLC selection,
Under the premise of meeting the control requirements,
Should consider the best performance tto price ratio, a reasonable choice of PLC A2ACPUR21 Dedicated Instructions Manual A2ACPUR21 Programming Manual.
System program memory for storing system program,
Including management procedures, monitoring procedures, as well as the user program tto do the compiler to compile the process of interpretation A2ACPUR21 Dedicated Instructions Manual A2ACPUR21 Programming Manual.
Read only memory. Manufacturers use, content can not be changed, power does not disappear.