PLC System Integration

In the manufacturing industry, there are a large number of open-loop sequential controls based on switch quantity, which perform sequential actions according to logical conditions and according to timing; in addition, there are controls that perform interlocking protection actions according to logical relationships that are unrelated to sequence and timing; as well as a large number of discrete quantity data acquisition and monitoring based on state quantities such as switch quantity, pulse quantity, timing, counter, and analog quantity over-limit alarm. Due to these control and monitoring requirements, PLC has developed into a product that replaces relay circuits and performs sequential control. PLC manufacturers have gradually added various communication interfaces to the original CPU template, and fieldbus technology and Ethernet technology have also developed simultaneously, making the application scope of PLC more and more extensive. PLC has the advantages of stability, reliability, low price, complete functions, flexible and convenient application, and convenient operation and maintenance. This is the fundamental reason why it can occupy the market for a long time.
The hardware of the PLC controller itself adopts a building block structure, with motherboard, digital I/O template, analog I/O template, special positioning template, barcode recognition template and other modules. Users can use the method of expansion on the motherboard or using bus technology to equip remote I/O slaves to get the desired I/O quantity according to their needs.
While realizing various numbers of I/O control, PLC also has the ability to output analog voltage and digital pulses, so that it can control various servo motors, stepper motors, variable frequency motors, etc. that can receive these signals. With the support of touch screen human-machine interface, PLC can meet the needs of users at any level in process control.