What is the main role of PLC communication module is

communication modules plc has a wide variety of purposes, but the main effect is the IPC host or master-slave control is established between the touch screen and downstream equipment. To choose what kind of communication module to see what you control, or what is going to a conversation. But you said the monitor is not connected thereto communication, because communication module plc is taking MODBUS or DP and industrial agreements. Monitor signal only VGA signal. So the two can not be mixed together.

plc's cpu running program

Indicating step program memory address counter inside the PLC CPU, the program is running, the step of the counter is automatically incremented for each execution, the program from starting step (step number zero) sequentially perform the final step (typically END instruction), and then return to the starting step cycle operation. The time required for one cycle of operation is completed for each PLC is called a sweep. Different types of plc module, cycle scanning period between 1 microsecond to tens of microseconds. PLC Ladder programming logic in solving aspect, showing the advantages of fast, in microseconds, logic solver 1K less than 1 millisecond. It all inputs are processed as a switch, 16 (there are 32) is an analog. Large PLC using another CPU to perform analog operations. The calculated results to the PLC controller. The same plc IO module system, with PLC than with the DCS, the cost is lower (about can save about 40%).

plc pace of development in the future

With increasing degree of factory automation and china plc market expanding capacity base, the growth rate in recent years PLC in industrial countries slowed. However, growth in China and other developing very rapidly PLC. Comprehensive relevant information, in 2004 global sales of PLC is about $ 10 billion, in the field of automation occupies a very important position.module plc is a touch imitation of the original relay control principle developed, in the 1970s the PLC only switch logic controller, the first application in the automotive manufacturing industry. It is stored in the implementation of logical, sequential control, timing, counting and arithmetic instructions such operations; and through digital input and output operations to control various types of machinery or production processes.

What are the features of the PLC CPU

plc controller functions also continue to improve. With computer technology, signal processing technology, control technology continues to develop network technology and continuously improve customer demand, PLC increased the analog processing and motion control functions on the basis of the amount of processing on the switch. Today's PLC is no longer confined to logic controller, motion control, process control and other fields also play a very important role. As the product of choice of discrete control system, PLC in the 1980s and 1990s has been developing rapidly, PLC worldwide annual growth rate was maintained at 20% to 30%.