FBM211 P0916JT FOXBORO

The development and application of OPC technology can benefit both suppliers and end users greatly.Firstly,OPC technology effectively separates hardware and application software.Hardware manufacturers only need to provide a set of software components,which can be used by all OPC client programs without the need to repeatedly develop driver programs.Once the hardware is upgraded,only the OPC server side I/O interface needs to be modified without modifying the client program.Secondly,industrial control software can access and operate devices from different hardware manufacturers in a unified manner by developing a set of OPC interfaces.In this way,software and hardware manufacturers can focus on their respective core components rather than compatibility issues.

For the end user,because there is no need to worry about interoperability,there is more room to choose and replace software and hardware,which will make the integration of heterogeneous computer systems very simple.Users can focus on the functionality and applications of the entire system,which also means a reduction in costs.In addition,the use of OPC components is also very convenient,and users only need to perform simple configurations.

The OPC server adopts a unified standard in the underlying control system,achieving effective connection between application programs and on-site devices,playing an important bridge role,and promoting the integration of enterprise on-site control layer,production process management layer,and business decision-making layer

Large systems with a single machine supporting 300 loops and 65000 I/O points correspond to medium-sized PLCs or above,all using 16-32 bit CPUs.Micro and small PLCs originally used 8-bit CPUs,but according to communication and other requirements,some have also switched to 16-32 bit CPUs.Due to the fact that PLC sales below I/O 64 account for 47%of the total PLC sales,while those between 64 and 256 account for 31%,totaling 78%of the total PLC sales,more research should be conducted on micro and small PLCs.

Hardware of PLC

The hardware of the PLC controller itself adopts a building block structure,and the product structures of various manufacturers are similar.Taking the Japanese Omron C200HE as an example,it has a bus template frame structure.The basic framework(CPU motherboard)is equipped with CPU templates,while other slots are equipped with I/O templates;If there are many I/O templates,the CPU motherboard can be connected to the I/O expansion motherboard through an I/O expansion cable,and I/O templates can be installed on it;Another method is to equip remote I/O slave stations,etc.These all indicate that PLC manufacturers