All PLC are major components are: A program memory RAM (you can extend some external memory EPROM). A processor with user interface for coupling to PLC. The module I / O. In addition, a complete PLC also comes another unit programmed by hand or by computer. Most units are simple programming contains enough RAM to form complete programs or supplements. If the programming unit is portable unit, which is typically the CMOS RAM with battery backup, only when the program has been tested and is ready to use the new transfer it to the PLC memory. For large PLC computer programming often to assist in writing, reading, and test programs. The programming unit connected to the PLC via RS232, RS422, RS485, ...
đang được dịch, vui lòng đợi..