Description
3HAC021799-003 DCS system
3HAC021799-003 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 3HAC021799-003 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.
R-TPD3 / ECS 通用电气GE 电路板
IC660BBD022 24伏直流电源输入/输出 GE
GE 发那科 IC660TBA101 温度输入
GE 发那科 IC660BBS101 输入输出块
GE 发那科 IC660BLC001 15英寸预制电缆
GE IS200VAICH1C 模块
P0926GH 福克斯波罗 foxboro 价格好得不得了
DBL4N00530-03M-000-S40 伺服电机 全新原装 价格美丽
GE 发那科 IC660TSD021 I/O块兼容
GE 发那科 IC660TSD100 输入/输出模块兼容
GE FANUC DS200RTBAG2AFB 模块
DS200DCFBG1B GE MARK 直流电源FB板 DS200 DCFBG1B
GE IS200TVBAH2ACC模块
GE DS200TCRAG1ABC 模块
MM300-GEHDSCABD
SR465 机械保护 SR465-P5-HI-A20 GE Fanuc 继电器电机管理装置
SR469 电机管理继电器 SR469-P1-HI-A20-E GE MULTILIN 469系列
SR469-P5-HI-A20 GE Fanuc 电机继电器管理装置 SR469-CASE
SR469-P5-LO-A20-E GE 继电器保护装置 SR469系列 469P5LOA20E
SR489-P1-HI-A20-T GE Multilin 489系列 电机保护装置
SR489-P5-A20-E Ge multilin 发电机管理继电器装置 带外壳
R34JENC-R2-NS-NV-00 伺服电机 全新原装 价格美丽
SR489-P5-LO-A20-E GE 发电机继电器保护装置 489-P5-LO-A20-E
SR750-P5-G5-D5-HI-A20-R GE MULTILIN 750馈线管理继电器
57160001-AAA/1 控制器模块 一手价格
DANAHER MOTION 科尔摩根电机 6SM27M-4.000-G KOLLMORGEN
GE 发那科 IC660TBD025 涌入电流为4安培
MM300-GEHD1CA 带 USB 的 GE Multilin 图形控制面板
IS200VSVOH1BDC 伺服控制GE
GE 发那科 IC660BBD020 通道可配置
GE IS230SNCIH2A 模块
GE DS200TCPSG1ARE 模块
GE UR8HH UR 8HH GE multilin UR 模块
GE Multilin 的 169PLUS-100N-125VDC 电机管理继电器
GE 发那科 IC660ELB912 通信波特率
469-P5-LO-A20-T GE 继电器加速跳闸 PLC启动控制模块
GE 发那科 IC660BRD024 模块化冗余(GMR)输出
DS200DCFBG1BNC GE 全新原装 包邮质保
GE Multilin MM300-GEHS1CADCXX
GE Multilin 469-P5-HI-A20-H 469 电机继电器 可升级控制备件进口
IC698CPE030 600 MHz CPU GE中央处理器
GPIB-140A/2 26个 NI 高速GPIB 总线扩展器卡件
GE 发那科 IC660TBR111 入/输出模块兼容
GE Multilin 电机管理 269 PLUS 数字继电器 269PLUS-120N-125VD
GE通用电气HYDRAN M2变压器监测系统 一年
GE通用电气 IC695NIU001处理器模块
GE 发那科 IC660BRD025 冗余下沉输出模块
GE美国DS200TCEAG1ACB模拟数字模块
GE美国 IC694ACC310 模拟输入模块 全系列
GE美国 IC693ALG222 模拟输入模块 全系列
GE美国 IC693ACC302A 模拟输入模块 全系列
GE 发那科 IC660MCA512 230伏交流电
GE 通用电气板卡 DS200TCQBG1A RST 扩展模拟 I/O板 Mark V系列
GE 模拟输入板 (PCB) IS200VAICH1DAB Speedtronic系列模块
GE 美国通用模块 IS200VCRCH1BBB IS200VCRCH1BBC 模拟量模块
UR系列 F35-E00-HCH-F8F-H6C-MXX-PXX-UXX-WXX GE继电保护器
GE 控制板 IS200CPFPG1A Speedtronic 涡轮控制 Mark VI 库存
GE 发那科 IC660CBB903 B相总线控制器
GE 发那科 IC660BSM021 输入输出总线系统
GE 发那科 IS420YUAAS1A 模拟量输入输出模块 Mark VIeS 库存
GE 发那科 IC660BBS103 支持Genius总线协议
GE 发那科 Fanuc 现场控制 IC670ALG310 模拟电压源输出模块
IMRDI01RTU 90 非隔离数字输入模块 库存 当日发货
GE Speedtronic MKVI IS215ACLIH1AM 应用控制层模块
GE MVE伺服卡 IS200VSVOH1B 通用电气 Speedtronic Mark VI
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
