Below, the bottom-up layer-by-layer analysis of all layers in the control site is performed:
On-site acquisition layer: It is mainly composed of field devices such as sensors and actuators, with a bus communication module.
Fieldbus: Field devices are connected to controllers via fieldbuses such as CAN, LonWork, ProfiBus, etc.
On-site control layer: Through logic controllers such as PLCs, PACs, etc., devices can be monitored via fieldbus. At the same time, traditional distributed control can also be achieved through I/O signals.
Local network: It can be a field bus, such as a CAN bus or a PROFIBUS bus. At the same time, it can also be other communication networks supported by various equipment manufacturers, such as the MPI network and local area networks used in other industrial sites. It is the channel that the controller's information is passed to the operation control platform.
Local operating layer: On-site monitoring of industrial computers, through a variety of configuration software for a variety of data acquisition, display, storage, can also control and set the following controller. Since the current controller supports multiple communication methods, this layer can use a large number of man-machine interface products that run configuration engineering, monitor operation, control, and data upload. At the same time, portable debugging equipment can be used for real-time maintenance of controllers and human-machine interface products. For example, using Siemens TP270HMI products for system monitoring, control, use of Siemens portable encoder PG products or laptops equipped with Siemens HMI software and STEP7 series controller PLC programming software (with serial port and Ethernet network communication ports), Perform maintenance and modification of the TP270HMI configuration project. At the same time, you can modify the logic commands of the PLC controller and monitor the controller's operating status.
Management network: It can be Ethernet or even the Internet, such as the plant area network, 802.11G wireless network, MODEM network, GPRS network, etc. Mainly responsible for a large number of on-site data uploads and remote management.
Central control layer: A hardware platform consisting of an industrial computer or a high-end human-machine interface. It is an industrial configuration software that integrates management and control. It collects and records large amounts of data at the industrial site, forms reports, and is responsible for remote monitoring. , scheduling, management.
Through analysis, the man-machine interface is at the core position of the current management and control integration site, connecting with the field bus, completing the on-site operation and management of the upper layer of the logic control system of the bus, and at the same time, responsible for uploading the site data and uploading the data concerned by the management of the center. . Therefore, the hardware communication interface is abundant, and the software has a variety of communication processing functions, which becomes one of the important features of the man-machine interface system.
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