GE IC698CPE030 control module
1. DCS is the abbreviation of distributed control system, which is applied in thermal power and large petrochemical, steel and other industries, and is initially good at the places where analog calculation and control and coordinated control of multiple controllers are used in thermal power and other industries; PLC is the abbreviation of logic controller, which is widely used and is initially good at logic control and sequence control places such as automobile industry. At this stage, there is no obvious boundary between DCS and (PLC+SCADA) systems, and their system structures and functions are basically the same in general industries. Scope of application PLC is mainly used in aerospace, power generation, petrochemical, steel, tobacco, pharmaceutical, food, petrochemical, metallurgy, mining, water treatment, transportation and other fields in process control, among which power plants are used in auxiliary workshops of large thermal power plants, water and electricity master control, etc. DCS is mainly used in process control, mainly in power generation, petrochemical, steel, tobacco, pharmaceutical, food, petrochemical, metallurgy, mining and other automation fields, among which the main control units of aerospace, thermal power, nuclear power, large petrochemical and steel must be controlled by DCS at present. The application of DCS and PLC in process control is mutually penetrating. In general, DCS can be used in all fields where PLC can be used functionally; Except for direct-fired engine, large thermal power master, nuclear power master, steel plant master and large petrochemical master, PLC+SCADA has all functions of DCS. We compare the hardware components of PLC and DCS. The architecture of PLC+SCADA is basically the same as that of DCS, or the architecture of PLC is more flexible. The subtle difference is that the hardware hot standby redundancy mode of PLC is dual-rack, dual-power supply, dual-processor and dual-network card redundancy mode. In the early days, DCS was dual-power supply and dual-DPU (distributed processing unit) on the same rack to form a redundant architecture. Now, DCS is composed of two integrated DPUs to form a hot standby redundancy architecture. The advantages and disadvantages of the two methods are not compared here. In terms of hardware * * *, PLC is unfavorable, and integrated CPU (DPU/CPU means that processors are not different) is more conducive to reduction. The redundant architecture of PLC has not changed, which is related to the early design architecture. Now some domestic PLC and DCS redundant architectures are the same. There is a difference between PLC and DCS in hardware. PLC has no redundant IO switching module, which may be that there is no demand for this module in the current PLC application field. In recent years, there has been * * * development in the design architecture of PLC. * * mainly promotes the bus communication mode between CPU and non-local support IO module and intelligent equipment, but instead uses industrial Ethernet. The bus is only used between local communication module and equipment, even the Ethernet 1-station infrastructure. DTM function can directly configure the equipment with standard protocol TCP protocol, and the communication is more convenient than DCS.
Touch screen, also known as “touch screen” and “touch panel”, is an inductive liquid crystal display device that can receive input signals such as contacts. When touching the graphic buttons on the screen, the touch feedback system on the screen can drive various connecting devices according to the pre-programmed program, which can replace the mechanical button panel, and create dynamic audio-visual effects by using the LCD screen. As a new type of computer input device, touch screen is the simplest, convenient and natural human-computer interaction mode. It brings a new look to multimedia and is an attractive new multimedia interactive device. No need to learn. Everyone can use it. This is the biggest magic of touch screen. The keyboard and mouse are not comparable. The touch screen is mainly used for public information inquiry, leadership office, industrial control, military command, electronic games, song and order, multimedia teaching, real estate pre-sale, etc.
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