MELSECNET/B.
Twisted pair bus. Input voltage range: AC100-120V/200-240V.
Output voltage: DC-15/15V.
Output current: A616DAV 0.7A/1.2A, for A616DAI.
I/O slot installation.
Is the analog output unit (A616DAV, A616DAI) dedicated power supply.
I/O points is an important indicator of PLC A1SJ71C24-R4.
Reasonable selection of I/O points can not onlyy satisfy the control requirements of the system,
And the total investment of the system is the lowest.
The input and output points and types of PLC should be determined according to the analog quantity and switch quantity of the controlled object,
Generally an input / output element to take up an input / output point A1SJ71C24-R4.
Taking into account the future adjustment and expansion,
In general should be estimated on the total number of points plus the amount of spare 20%~30% A1SJ71C24-R4.
The following describes the centralized control system I/O points of the estimate.
Input type: DC input, positive common end.
Input points: 16 points.
Enter the response time: 1.5ms the following.
Rated input voltage / current: DC24V/7mA MITSUBISHI A1SJ71C24-R4.
External connection: 2~4 line type.
Waterproof connector type.
Strong waterproof type of IP67 protection grade.
No need to stop the system can be replaced module.
Without the use of tools can be a simple connection, save time.
Terminal resistor built-in MITSUBISHI A1SJ71C24-R4.
Can be installed along the 6 direction.
Hardware simulation method is to use a number of hardware equipment to simulate the generation of the signal,
The signals are connected to the input end of the PLC system in a hard wired way, and the timeliness is strong.
Software simulation method is in the MITSUBISHI PLC in the preparation of a set of simulation program,
The simulation provides the field signal, which is simple and easy to operate, but it is not easy to guarantee the timeliness MITSUBISHI A1SJ71C24-R4.
Simulation of the process of debugging, debugging method can be used to segment, and the monitoring function of programmer. Output points: 32 points.
Voltage: DC12/24V.
OFF leakage current: 0.1mA.
Output type: transistor output (type sink).
Response time: 2ms.
16 points / a common end.
38 point terminal station.
With short circuit protection. With the surge absorber.
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.
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 to price ratio, a reasonable choice of PLC.
System program memory for storing system proggram,
Including management procedures, monitoring procedures, as well as the user program to do the compiler to compile the process of interpretation A1SJ71C24-R4.
Read only memory. Manufacturers use, content can not be changed, power does not disappear.