Due to the need, the timed shutdown function is often needed inside the plc. The timed shutdown is generally to compare whether the PLC internal clock (or human-machine clock) has reached or exceeded the set time, and the shutdown program is executed when it is satisfied. Here's the time comparison method, I have used the following:
General comparison method
It is to compare one by one from "year", "month" and "day", and then to "block or" according to each situation. This method is more troublesome.
2. Digital algorithm
Think of "year, month, and day" as a number and store it in DW. For example, "2013/1/23" will be regarded as "20130123", that is, year *10000+month*100+day.
3. Conversion method
Convert "Year, Month, Day" into BCD code, such as "January 23, 2013" and convert to "20130123H".
4. Instruction method (the simplest)
Convert "day, month, year" directly with the -> SEC directive. This method is currently considered to be the fastest.
The main wiring material in the network integrated wiring system is the Network Cable, including twisted-pair cable, optical fiber, optical fiber and so on.In order to protect the wiring line, ensure the neat and beautiful wiring place, but also to facilitate the later operation and maintenance, the integrated wiring system will also use some accessories, such as distribution frame, information socket, jumper, cabinet and frame, wire slot, pipe and bridge frame, finishing tools, etc.
For Example Patch Pannel:
patch pannel is used for end-user line or trunk line. Its function is to provide interface for the connection of optical cable, cable and other equipment. It is the most important component in the management subsystem, and also the hub to realize the cross connection of vertical and horizontal trunk subsystems.
Depending on the location, the distribution frame is divided into main distribution frame and intermediate distribution frame, in which the main distribution frame is used for the distribution of buildings or buildings, and the middle distribution frame is used for the distribution of floors.According to the different transmission medium, distribution frame is divided into twisted-pair distribution frame and optical fiber terminal box.
Network Accessories,Electrical Faceplate,Patch Panel,Wall Mount Patch Panel
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