Superior microcontroller based industrial timer On line via Any Electronics Co., Ltd.
The corporation specializes in offering electronic merchandise including microcontroller based industrial timer, programmable timers, programmable digital timers, proximity switches, inductive linear sensors, photo-electronic switches, optical screen sensors, solid state relay, and switch energy supply, among others. The buyer friendly web page aims to provide excellent high quality at reasonably priced prices to service seekers across the globe.
Located in China?¡¥s Liushi, Any Electronics is usually a corporation that prides itself on continually adapting to technological development. The organization gives services in machinery manufacturing, motor program manage, distribution transmission, handle device, oil and mining, automation market, solar control, lighting manage as well as other such locations. The company also supplies new item improvement and OEM solutions. All solutions presented are strictly in accordance with ISO9002.
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ive been given an assignment in college and have to explain the Internal architecture of a plc, which i could use help on if someone has it, but im having trouble finding anything on the batch and scanning process operations, help would be appreciated, thanks
And got the following answer:
I will try to answer this: The internal hardware architecture is much the same as other microcontroller based systems with analogue and digital I/O, and RAM and ROM and communications links. The configuration is flexible (modular) so the I/O can be configured to suit the task, by plugging in appropriate modules. This makes it reasonably easy to reconfigure the system as the task changes. The software is what makes them different, as it is organised to be easily programmed for the tasks expected in industrial situations, to do with running machines, monitoring sensors, event processing and timing. This may be called real time control. They can use ladder logic diagrams, but there are many different languages. Some have specialised versions of basic etc. The software is usually written on a PC and downloaded. About Batch and Scanning, I think you mean how is the software written? Batch.. A batch process has a start event and an end event. Consider making bread. The operator may enter the quantities for the job, then press a button when ready. The controller could heat the oven and control the temperature, or just turn it on and wait a specific time. It could weigh the materials, fill the hopper, start the mixing, provide the appropriate wait time, then sound an alarm signalling it is ready for the next stage. Whether it could get the dough out and chop it up and put it in the oven depends on whether such machines are available. They could have their own PLCs, so each simply passes the process on to the next task. ALternatively there could be a central processor controlling it all, either a PLC or something with displays and other features not normally found on a PLC. Scanning.. I think you mean monitoring, where the PLC loops around testing for some value, or looking for an event, and acting on it. This is more suitable for a continuous process, like regulating a temperature, operating a safety system, running a conveyor belt. There is no basic reason why the two methods can't be used in the same PLC, because they can be different parts of the same program. Sometimes they may not even need to be concurrent. If there are other complicated time consuming tasks, it is less possible to monitor continuously, rather than sequentially, depending on the software model. Can it run concurrent processes, or do they have to be sequential? It depends on just how these things need to be done, and the software. Even in basic, there can be a loop that monitors software flags, timers, readings and events. The program branches out to perform tasks as they are detected, and returns to the loop when they are done. It must never spend too long on any task. The design may have a limit of a few seconds or a few milliseconds for any task in the loop, as well as a different time for how long it takes to detect an event. If things are not fast enough, individual tasks can be passed off to other PLCs, using the networking. This provides better concurrency, because there is less for each PLC to do, and it can be more specialised for the task at hand. It gets a start signal, and provides a status signal in reply. The ability to perform concurrent tasks (multitasking) is improving in PLCs. Hope that was helpful?
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