Industrial control
It is a general term for a computer system that uses a bus
structure to detect and control the production process and its
electro mechanical equipment and process equipment. Referred to as the
industrial computer. It consists of two parts: computer and process input
and output (I/O).
The computer is composed of a host, an input/output device, an
external disk drive, a tape drive, and the like. A part of the process
input/output channel is added outside the computer, and the test data for
completing the industrial production process is sent to the computer for
processing; on the other hand, the computer is required to exercise the control
command for the production process control and convert the information into the
control variable of the industrial control object.
The signal is sent to the controller of the industrial control
object. The controller controls the operation of the production equipment. The
main categories of industrial computer are: IPC (PC bus industrial computer),
PLC (programmable control system), DCS (distributed control system), FCS (field
bus system) and CNC (CNC system).
1, IPC
That is, an industrial computer based on a PC bus. According
to IDC statistics in 2000, PCs accounted for more than 95% of general-purpose
computers. Because of their low price, high quality, large output, and abundant
software/hardware resources, they have been familiar and recognized by the vast
number of technicians.
Annoying foundation. Its main components are
industrial chassis, passive backplane and various boards that can be inserted
into it, such as CPU cards, I/O cards, etc. It also adopts all-steel
casing, machine bar bead filter, double positive pressure fan and other EMC
(Electro Magnetic Compatibility) technology to solve electromagnetic
interference, vibration, dust, high/low temperature and other problems in the
industrial field.
IPC has the following characteristics:
Reliability: Industrial PCs have dust and smoke, high/low
temperature, humidity, vibration, corrosion and rapid diagnosis and
maintainability. The MTTR (Mean Time to Repair) is generally more than 100,000
hours.
Real-time, industrial PC real-time online detection and control
of industrial production process, quick response to changes in working
conditions, timely acquisition and output adjustment (watchdog function is not
available in ordinary PC), self-reset in distress, Ensure the normal operation
of the system.
Expandability, industrial PC has a strong input and output
function due to the base plate + CPU card structure, which can expand up to 20
boards, and can be used with various peripherals, boards such as controllers
and video surveillance in the industrial field. Systems, vehicle detectors,
etc. are connected to accomplish various tasks.
Compatibility, can use ISA and PCI and PICMG resources at the
same time, and support various operating systems, multi-language assembly, and
multi-tasking operating system.
2, programmable controller (PLC)
PLC full name ProgrammableLogicController, Chinese full name is
programmable logic controller, defined as: an electronic system for digital
operation, designed for industrial environment applications. It uses a
class of programmable memory for its internal memory program, performing
user-oriented instructions such as logic operations, sequence control, timing,
counting and arithmetic operations, and controlling various types of machinery
through digital or analog input/output. Or the production process.
Programmable
Logic Controller (ProgrammableLogicController) is a digital computing operation
electronic system designed for industrial applications. It uses a
programmable memory that stores instructions for performing operations such as
logic operations, sequence control, timing, counting, and arithmetic
operations, and controls various types of mechanical equipment or production
through digital or analog input and output Process.
Programmable controller is a new type of universal automatic
control device developed in combination with computer technology and automatic
control technology. It is a replacement product of traditional relays.
With
the rapid development of microelectronics technology and computer technology,
programmable controllers have more functions of computers, not only for logic
control, but also for data processing, communication, and network functions.
Because it can change the control process through software, and has the characteristics of small size, convenient assembly and maintenance, simple programming, high reliability, strong anti-interference ability, etc., it has been widely used in various fields of industrial control, greatly promoting mechatronics. process.
Because it can change the control process through software, and has the characteristics of small size, convenient assembly and maintenance, simple programming, high reliability, strong anti-interference ability, etc., it has been widely used in various fields of industrial control, greatly promoting mechatronics. process.
3. Decentralized control system (DCS)
It is a high-performance, high-quality, low-cost, flexible
configuration of distributed control system products, which can form a variety
of independent control systems, distributed control system DCS, monitoring and
data acquisition system (SCADA), to meet various industrial fields. The need
for process control and information management.
The system's modular
design, reasonable software and hardware function configuration and easy to
expand capabilities, can be widely used in the decentralized control of various
large, medium and small power plants, the transformation of power plant
automation systems and steel, petrochemical, paper, cement, etc. Industrial
production process control.
4. Fieldbus system (FCS)
It is an all-digital serial, two-way communication system. In-system
measurement and control devices such as probes, actuators and controllers can
be connected, monitored and controlled. In the classification of the
factory network, it is used as a local network for process control (such as
PLC, LC, etc.) and application of intelligent instruments (such as inverters,
valves, bar code readers, etc.), and has embedded control applications
distributed on the network. Features. Due to its broad application
prospects, many foreign powerful manufacturers are competing to invest in
product development. There are more than forty types of fieldbuses known
internationally. The typical fieldbuses are: FF, Profibus, LONworks, CAN, HART,
CC-LINK, etc.
5, CNC system (CNC)
The modern numerical control system is a numerical control
system using a microprocessor or a special microcomputer. The system logic
(software) stored in the memory is used to realize the control logic, realize
some or all of the numerical control functions, and connect with peripheral
devices through the interface, which is called a computer. CNC, referred to as
CNC System.
CNC machine tools are mechatronic products formed by the
penetration of new technologies represented by numerical control systems into
the traditional machinery manufacturing industry; their technical scope covers
many fields: (1) mechanical manufacturing technology; (2) information
processing, processing and transmission technology; (3) automatic control
technology; (4) servo drive technology; (5) sensor technology; (6) software
technology.
0 Comments