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In addition, there are also HPCs from Honeywell, PREDICTROL from Yokogawa, and predictive controllers based on Kalman filters developed by Yamamoto Honeywell in the TDC-3000LCN system. This type of predictive controller does not simply place the Kalman filter before the previous predictive control for noise filtering, but instead uses the Kalman filter as the optimal state speculator, performing both optimal state speculation and noise filtering.

There are still many advanced control algorithms. At present, many control software companies and DCS manufacturers both domestically and internationally are competing to develop engineering software packages for advanced control and optimized control, hoping to embed advanced control and optimized control strategies in configuration software

When a large amount of on-site information is directly entered into the computer control system through intelligent instruments or through the field bus, there is a problem of sharing and interacting with on-site information by internal computer applications.

Due to the lack of unified connection standards, industrial control software often requires the development of dedicated drivers for hardware devices. Once the hardware device is upgraded, it is necessary to make changes to the corresponding driver program, which increases the maintenance cost of the system. Even if the SCADA in the computer has independent drivers, it is generally not allowed to access the same devices simultaneously, otherwise it is easy to cause system crashes

It can be seen that the on-site control layer, as the bottom layer of the entire enterprise information system, inevitably needs to be integrated with the process management layer and business decision-making layer. This also poses the problem of how monitoring computers communicate and transmit information with other computers.