Description
ABB PM825 module
Contact: Mr. Lai
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Principle of automatic control system
Automatic control system refers to using some automatic control devices to automatically control some key parameters in production, so that they can be automatically adjusted to return to the numerical range required by the process when they deviate from the normal state due to external interference (disturbance). Various technological conditions in the production process cannot be static. Especially in chemical production, most of them are continuous production, and each equipment is interrelated. When the process conditions of one of the equipment change, some parameters of other equipment may fluctuate more or less, deviating from the normal process conditions. Of course, automatic regulation means no direct participation of people.
Principle: some key parameters in production are automatically controlled, so that they can be automatically adjusted to return to the numerical range required by the process when they deviate from the normal state due to external interference (disturbance). The automatic control system is divided into open loop and closed loop, specifically:
Principle of closed loop automatic control system: closed loop control is (negative) feedback control. The principle is similar to the purposeful behavior of humans and animals. The system consists of sensors (equivalent to senses), control devices (equivalent to brain and nerves), and actuators (equivalent to hands, legs, and muscles). The sensor detects the state information (output) of the controlled object and converts it into a physical (electrical) signal to the control device. The control device compares the deviation between the current state (output) of the controlled object and the desired state (given quantity), generates a control signal, and drives the controlled object to move through the actuator to make its motion state close to the desired state.
Open loop automatic control system principle: according to the predetermined program, send signals to control objects in turn. According to the conditions of signal generation, open-loop control has time limit control, sequence control and condition control. Since the 1980s, programmable controllers produced by microelectronics technology have been widely used in industrial control (elevators, multi step machine tools, water plants). Of course, some complex systems or processes often use multiple control types and multiple control programs.
Principle:
Automatic control (principle) refers to the use of additional equipment or devices (called control devices or controllers) to automatically operate a machine, equipment or production process (collectively referred to as the controlled object) according to a predetermined rule under the condition that no one directly participates.
Principle of automatic control system
automatic control system
In order to realize various complex control tasks, the controlled objects and control devices must be connected in a certain way to form an organic whole, which is the automatic control system. In the automatic control system, the output of the controlled object, that is, the controlled quantity, is a physical quantity that requires strict control. It can be maintained as a constant value, such as temperature, pressure or flight path; The control device is the whole body of the relevant mechanism that controls the controlled object. It can control the controlled object with different principles and methods, but the most basic one is the feedback control system based on the feedback control principle.
feedback control system
In the feedback control system, the control function that the control device exerts on the controlled device is the feedback information taken from the controlled quantity, which is used to constantly correct the deviation between the controlled quantity and the control quantity to achieve the task of controlling the controlled quantity. This is the principle of feedback control.
The following is a standard feedback model:
Prescribed by:
Formula: X (n+1)=Xn+(A/Xn ^ 2-Xn) 1/3 Set A=5, open to the 3rd power
5 is between 1 ^ 3 and 2 ^ 3 (1 to the 3rd power=1, 2 to the 3rd power=8)
X_ 0 can be taken as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0. For example, we take 2.0. According to the formula:
Step 1: X1={2.0+[5/(2.0 ^ 2-2.0] 1/3=1.7.}. That is, 5/2 × 2=1.25，1.25-2=-0.75，0.75 × 1/3=0.25, input value is greater than output value, negative feedback
2-0.25=1.75, take two digits, i.e. 1.7.
Step 2: X2={1.7+[5/(1.7 ^ 2-1.7] 1/3=1.71}..
I.e. 5/1.7 × 1.7=1.73010，1.73-1.7=0.03，0.03 × 1/3=0.01, input value is less than output value, positive feedback
1.7+0.01=1.71。 Take 3 digits, one more digit than the previous one.
Step 3: X3={1.71+[5/(1.71 ^ 2-1.71] 1/3=1.709} input value is greater than output value, negative feedback
Step 4: X4={1.709+[5/(1.709 ^ 2-1.709] 1/3=1.7099} Input value is less than output value positive feedback
This method can be automatically adjusted. The values in the first and third steps are larger, but the output value will automatically decrease after calculation; Step 2 and step 4: the input value is too small, and the output value increases automatically. X4=1.7099.
Of course, any of 1.1, 1.2, 1.3,… 1.8, 1.9 can also be taken.
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Company advantage service:
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
All kinds of module card driver controller servo motor servo motor embedded card wires and cables Power module control module is applicable to steel, hydropower, nuclear power, power generation, glass factory, tire factory, rubber, thermal power, paper making, shipping, navigation, etc
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
