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GE IC660HHM510NGE IC690RFH008 Controller module

GE IC660HHM510NGE IC690RFH008 Controller module

DCS usually adopts a hierarchical hierarchical structure, each level consists of several subsystems, each subsystem to achieve a number of specific limited goals, forming a pyramid structure. Examining the hierarchy of DCS, DCS level and control management level are the two most basic components of DCS.

The process control level realizes the decentralized control functions of signal input, transformation, operation and output. In different DCS, the control devices of the process control level are different, such as process control unit, field control station, process interface unit, etc., but their structural form is roughly the same, and they can be collectively referred to as field control unit FCU. The process management level is composed of engineer station, operator station, management computer, etc., to complete the centralized monitoring and management of the process control level, usually called the operation station. The hardware and software of DCS are designed according to the modular structure, so the development of DCS is actually to combine the various basic modules provided by the system into a system according to the actual needs, this process is called the configuration of the system.

1. Field control unit

The field control unit is generally far away from the control center and installed near the site, and its highly modular structure can be configured into process control units ranging in size from a few monitoring points to hundreds of monitoring points according to the needs of process monitoring and control.

The structure of the field control unit is composed of a number of decentralized boards (or cards) installed in the board box according to a certain logical or physical sequence, and the bus connection between the field control unit and the control management level is adopted to realize information exchange.

The hardware configuration of the onsite control unit is as follows:

Configure hardware devices such as host plug-ins (CPU plug-ins), power plug-ins, I/O plug-ins, and communication plug-ins according to system requirements and control scale.

Hardware redundancy configuration Redundant configuration of key devices is an important means to improve the reliability of DCS. DCS can realize redundant configuration of host plug-ins, power plug-ins, communication plug-ins, network plug-ins, and critical I/O plug-ins.

Hardware installation of different DCS, for the installation of various plug-ins in the plug-in box, there will be corresponding provisions in the logical order or physical order. In addition, the field control unit is usually divided into the basic type and the extended type of two, the so-called basic type is a variety of plug-ins installed in a plug-in box, but more often when the need for extensible structural form, that is, a field control unit also includes a number of digital input/output expansion units, the use of bus connected to each other.

In essence, the structural form and configuration requirements of the field control unit are consistent with the hardware configuration of the modular PLC.

2. Operation station

The operation station is used to display and record the process data from each control unit, and is the operation interface for people to interact with the production process information. Typical operating stations include host systems, display devices, keyboard input devices, information storage devices and print-out devices, etc., mainly to achieve powerful display functions (such as analog parameter display, system status display, a variety of screen display, etc.), alarm function, operation function, report printing function, configuration and programming functions.

In addition, DCS operation station is also divided into operator station and engineer station. From the system function point of view, the former mainly realizes the general production operation and monitoring tasks, with data acquisition and processing, monitoring screen display, fault diagnosis and alarm functions. In addition to the general functions of the operator station, the latter should also have the configuration of the system, the modification of the control target and other functions. In terms of hardware equipment, most systems have engineer and operator stations combined and are distinguished by only one engineer keyboard. A set of label printing control system based on PLC and industrial computer is developed by using encoder, PLC, weighing instrument, bar code printer and host configuration software online monitoring function. The composition, working principle and design scheme of the system are given, and the software development process and actual work effect of the system are emphasized. The system has a high degree of automation and simple operation The characteristics of single, fast response and low failure rate are worthy of vigor

GE IC660HHM510NGE IC690RFH008 Controller module