The PLCs Communications can be separated into 4 groups:
•MIS and PC Networks
•Networks of PLC
•Serial buses and Remote I/O
•Serial of Traditional 3rd party
MIS and PC Networks
The MIS and PC Networks are devices more towards handling of Data and Information for QC purposes and they are not used for machine control. That is the main difference between a MIS or PC network and a dedicated Industrial Network. The networks of industrial PLC are fail-safe and are devoted to machine control. Commonly, Ethernet is presented on High End PLCs or a Ethernet Card can be included to the majority PLC racks. Consider of this as a gate way to the Industrial Network Data mostly for purposes of reading and possibly changes of Password Protected Data
Networks of PLC
The networks of PLC generally have some high speed serial protocol sort devoted to Data switch over between PLCs. The majority of the Medium Platform of PLCs have a Network Card that can be inserted to the back-plain or might be presented on the high end of PLC CPUs. The benefits of networking are obvious when planning larger turn-key systems. The information such as analog, digital, data, faults can be distributed between all machines in next to actual time. Another benefit is the capability to be placed at any machine and being capable to create program changes on any machine linked to the network. Even further exciting is being online with 3 or 4 machines concurrently and making the changes online though the machines are working. If you desire to acquire this one step advance you could put in a module of wireless and really does the same thing wireless though it does not recommend.
Serial buses and Remote I/O
Once more let’s to be clear that Serial buses and Remote I/O are Industrial Serial Protocols that are planned for Control of Machine and are Fail-Safe. Approximately any card or device that you would conventionally mount on a Rack of PLC is presented with some serially protocol sort. The speeds of these devices of Remote utilize to be the limiting reason when thinking but that is taken care Devices of Remote are a fine design solution particularly when you have constant rotating components on a turret or when I/O is positioned far from the Panel and PLC. The design is a single machine that you do not require I/O of Remote.