Description
AX670 3BSE000566R1 DCS system
AX670 3BSE000566R1 DCS system
Module Clips Drive controller servo motor
Contact: Mr. Lai
Wechat:17750010683
Whats app：+86 17750010683
Skype：+86 17750010683
QQ: 3221366881
3221366881@qq.com
Analysis of PLC”s most basic serial communication
When using PLC, electric power operators will be exposed to many communication protocols and communication interfaces. Do you know the most basic PLC serial communication and basic communication interfaces?
Serial port is a very general device communication protocol on the computer (don”t confuse it with Universal Serial Bus or USB). Most computers contain two serial ports based on RS232. The serial port is also a common communication protocol for instruments and meters; Many GPIB compatible devices also have RS-232 ports. At the same time, the serial communication protocol can also be used to obtain data from remote acquisition equipment.
Serial communication is completed with three wires: (1) ground wire, (2) transmission, and (3) reception. Because serial communication is asynchronous, the port can send data on one line and receive data on another line. Other lines are used to shake hands, but are not necessary.
The most important parameters of serial communication are baud rate, data bit, stop bit and parity. For two ports to pass, these parameters must match:
a. Baud rate: This is a parameter to measure the communication speed. It represents the number of bits transmitted per second. For example, 300 baud means sending 300 bits per second. When we mention the clock cycle, we mean the baud rate. For example, if the protocol requires 4800 baud rate, the clock is 4800Hz. This means that the sampling rate of serial communication on the data line is 4800Hz. Generally, the baud rate of the telephone line is 1440028800 and 36600. The baud rate can be much larger than these values, but the baud rate is inversely proportional to the distance. The high baud rate is often used for communication between closely placed instruments.
b. Data bit: This is a parameter to AX670 3BSE000566R1 DCS system measure the actual data bit in communication. When the computer sends a packet, the actual data will not be 8 bits, and the standard values are 5, 7 and 8 bits. How to set depends on the information you want to send. For example, the standard ASCII code is 0~127 (7 bits). The extended ASCII code is 0 to 255 (8 bits). If the data uses simple text (standard ASCII code), then each packet uses 7-bit data. Each packet refers to a byte, including start/stop bit, data bit and parity bit. Since the actual data bit depends on the choice of communication protocol, the term “packet” refers to any communication situation.
c. Stop bit: used to represent the last bit of a single package. Typical values are 1, 1.5 and 2 bits. Because the data is timed on the transmission line, and each device has its own clock, it is likely that there is a small unsynchronization between the two devices in the communication. Therefore, the stop bit not only indicates the end of transmission, but also provides an opportunity for the computer to correct clock synchronization. The more bits applicable to the stop bit, the greater the tolerance of different clock synchronization, but the slower the data transmission rate.
d. Parity bit: a simple error detection method in serial communication. There are four error detection methods: even, odd, high and low. Of course, there is no check bit. In the case of even and odd parity, the serial port will set the parity bit (the bit after the data bit), and use a value to ensure that the transmitted data has even or odd logical high bits. For example, if the data is 011, for even parity, the check bit is 0, and the number of digits with high logic is even. If it is odd check, check bit 1, so there are three logical high bits. The high and low bits do not really check the data. Simply set the logic high or low to check. In this way, the receiving device can know the status of a bit and have the opportunity to judge whether there is noise interfering with communication or the data transmitted and received are not synchronized.
a. What is RS-232?
RS-232 (ANSI/EIA-232 standard) is the serial connection standard on IBM-PC and its compatible computers. It can be used for many purposes, such as connecting a mouse, printer or Modem, and also connecting industrial instruments and meters. For the improvement of drive and connection, the transmission length or speed of RS-232 often exceeds the standard value in practical applications.
RS-232 is only limited to point-to-point communication between PC serial port and equipment. The maximum distance of RS-232 serial communication is 50 feet.
b. What is RS-422?
RS-422 (EIARS-422-AS Standard) is the serial port connection standard of Apple”s Macintosh computer.
RS-422 uses differential signal and RS-232 uses signal of unbalanced reference ground. Differential transmission uses two lines to send and receive signals. Compared with RS-232, it can better resist noise and have a longer transmission distance. Better noise resistance and longer transmission distance are great advantages in industrial environment.
c. What is RS-485?
RS-485 (EIA-485 standard) is an improvement of RS-422 because it increases the number of devices from 10 to 32, and defines the electrical characteristics under the maximum number of devices to ensure sufficient signal voltage. With the ability of multiple devices, you can use a single RS-422 port to establish a device network. Excellent anti-noise and multi-device capability. RS-485 will be selected for serial connection when establishing distributed device network connected to PC, other data collection controllers, HMI or other operations in industrial applications.
RS-485 is a superset of RS-422, so all RS-422 devices can be controlled by RS-485. RS-485 can use more than 4000 feet of cable for serial communication.
美国GE 8521-LC-MT 通用电气 PLC模块
GE DS200DMCBG1AED DS215DMCBG1AZZ03A 通用电气模块
GE SR489-P5-HI-A20-E 发电机管理继电器 489-P5-LO-A20
GE VMIACC-5595-208 350-805595-208L 八端口反射内存交换机
GE IC695CRU320CA-EL 冗余CPU模块 IC695CRU320-BB
MOOG m128-010 穆格 控制器 加密狗模块
GE VMIVME2510B 可编程控制器 输入/输出板
SR469-P1-HI-A20 GE模拟输出 469 电机管理继电器
GE TEWS板卡 TPMC815-50 通用电气模块 TPMC871-50
DS200SDCIG2AHB GE DC电源和仪器板 通用电气
GE D20C TERMINATION 机器人系统 伺服控制系统
DS200SDCIG2AHB GE 直流电源 反馈卡 电路板
D136-001-007 美国MOOG 穆格控制器 驱动器 加密狗系列
GE IC697CPX928 可编程逻辑控制器 IC697CPX928-FE
GE VMIVME 4140-001 VMIVME4140 VMIC系列主板板卡
IC698PSA100 GE I/O通信 CPU处理器模块 控制系统
DS200RTBAG2AFB GE 通用电气 电源模块 电路板反馈卡
IS200EGDMH1AFF GE 电路板 CPU处理器模块 电源模块
VMIVME-7700 GE 电路板 CPU处理器模块 电源模块
GE VMIVME7740-841 CPU处理器模块 控制板 通用电气
IS220PPROS1B GE 电路板 CPU处理器模块 电源模块
DS200DMCBG1AKG GE 通用电气 电源模块 DC电源板
DS200DMCBG1AED GE 通用电气 电源模块 电路板反馈卡
DS200DCFBG1BGB GE 直流电源 反馈卡 电路板 模块进口备件
GE DS215DMCBG1AZZ03A 通用电气电子电路卡 DS215KLDCG1AZZ03A
GE PQMII-T20 美国通用电气 电能质量表 品质保证
GE IS420ESWBH3A 美国燃机卡通用电气模块
GE IC698CPE040 中央处理器 微处理器 控制器
VMIVME-7486 VMIVME-7750 GE 电路板 控制器系统
IS215ACLEH1BB GE 电路板 CPU处理器模块 电源模块
IC698CPE040-JP GE 电路板 CPU处理器模块 控制系统
GE IC697CPX935 中央处理机 IC697CPX928 美国通用电气
GE IC698RMX016 VMIVME-5567-100 CPU冗余系统
IS420UCSBH4A GE 通用电气控制器 模块 卡件 IS420ESWBH3A
IS220PPRFH1A GE 电路板 CPU处理器模块 电源模块
IC698ETM001 GE 以太网接口模块 IC698CPE030
HE700GEN200 GE HE700GEN100 卡件模块备件 美国通用电气
IS220PPRFH1B GE 控制器IO模块 CPU处理器模块 电源模块
GE DS200DCFBG1BLC 卡件模板 电源板Mark V系列
GE IC698CPE040-JP 中央处理器 IC698CPE040 控制主板
IS220PAOCH1A GE 控制器IO模块 CPU处理器模块 电源模块
IC690RFH008 GE 美国控制器模块 通用电气模块
GE VMIVME-7807 VMIVME-017807-413000 控制卡 VMI系列主板供应
IS220PPDAH1B GE 控制器IO模块 CPU处理器模块 电源模块
8851-LC-MT 美国GE 8810-HI-TX 网络控制器 PLC模块 工控备件
GE IS420UCSBH1A Mark VIe 控制器 IS420UCSBH4A
GE IC698CMX016-ED 控制存储器Xchange模块 IC698CPE030
GE 369-HI-R-M-0-0-0-E 电机保护继电器 保护装置
IC697CPM790-GD GE CPU单元 控制系统 通用电气模块 电源模块
GE DS200LDCCH1ALA 变频器 控制主板单元 Mark V系列驱动板
GE V7768-322001 通用电气 工控备件 控制系统模块
IP-QUADRATURE GE 控制器 通用计数器 PLC工控备件
IS220PDIAH1B GE 控制器IO包 CPU处理器模块 电源模块
GE VMIVME-7807RC CPU板 控制板主板 通用电气
ACC-5595-208 GE 反射内存交换机 集线器组件
CP320260 KOLLMORGEN 伺服驱动器 科尔摩根系列
IS200SPIDG1ABA GE 涡轮机专用I/O IS200SRTDH2ACB
IC695CPE310-ACAT GE CPU控制器 PACSystem RX3i系列
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
