The FOXBORO 130M-N4 pneumatic controller module is generally installed away from the control center and close to the site. Its highly modular structure can be configured from a few monitoring points to hundreds of monitoring points according to the needs of process monitoring and control. process control unit. The structure of the field control unit is composed of many plug-in boards (or cards) with dispersed functions installed in the plug-in box in a certain logical or physical sequence. Each field control unit and the control management level are connected by a bus. Realize information exchange. The hardware configuration of the on-site control unit needs to complete the following: The configuration of the plug-in configures the host plug-in (CPU plug-in), power plug-in, I/O plug-in, communication plug-in and other hardware devices according to the system requirements and control scale; the hardware redundancy configuration is for key equipment Redundant configuration is an important means to improve the reliability of DCS. DCS can usually implement redundant configuration for host plug-in, power plug-in, communication plug-in, network, and key I/O plug-in.

Different DCS hardware installations will have corresponding regulations on the logical or physical order for the installation of various plug-ins in the plug-in box. In addition, on-site control units are usually divided into two types: basic type and extended type. The so-called basic type of FOXBORO 130M-N4 pneumatic controller module means that various plug-ins are installed in a plug-in box, but more often an expandable structure is required. , that is, a field control unit also includes several digital input/output expansion units, which are connected to each other by buses.

In essence, the structural form and configuration requirements of the on-site control unit are consistent with the hardware configuration of the modular PLC. Operation station The operation station is used to display and record process data from each control unit. It is an operating interface for human and production process information interaction. The typical operating station of FOXBORO 130M-N4 pneumatic controller module includes host system, display device, keyboard input device, information storage device and print output device, etc. It mainly realizes powerful display functions (such as simulation parameter display, system status display, various Screen display, etc.), alarm function, operation function, report printing function, configuration and programming function, etc. In addition, the DCS operating station is also divided into operator station and engineer station. From the perspective of system functions, the FOXBORO 130M-N4 pneumatic controller module mainly implements general production operations and monitoring tasks, and has functions such as data collection and processing, monitoring screen display, fault diagnosis and alarming. In addition to the general functions of the operator station, the latter should also have functions such as system configuration and control target modification. From the perspective of hardware equipment, the engineer station and operator station of most systems are combined and only distinguished by an engineer keyboard.