Delta plc and pc485 communication protocol (Delta plc and plc communication)

Today, I will share with you the knowledge of Delta plc and pc485 communication protocols. I will also explain Delta plc and plc communication. If you can happen to solve the problems you are facing now, don't forget to pay attention to this site, let's start now!

List of contents for this article:

• 1、How to use a computer to communicate with Delta PLC's 485 port through 485 port.
• 2、Delta plc uses 458 communication (Xiaobai can understand)
• 3、Delta PLC's 485 communication issues
• 4、Example tutorial of RS485 serial communication between Delta PLC and upper computer
• 5、Delta plc485 communication protocol
• 6、Delta PLC Communication RTU Mode

How to use a computer to communicate with Delta PLC's 485 port through 485 port.

Most computers only have a USB interfaceDelta plc and pc485 communication protocol, you can find a USB to 485 board on Taobao and complete the conversion through the interface. As shown in the figure, the most commonly used Delta PLCs have 32 interfaces and 485 interfaces. butDelta plc and pc485 communication protocolThe physical layer we commonly use when developing a product is the POWERBUS bus, a conscientious domestic field bus. Equipped with standard RS485 interface conversion, transparent transmission of any protocol. The main reason for using it as the physical layer is stability. There is no requirement for wire and strong anti-interference ability. It is generally used for communication between PLC and various instruments.

First use the USB to RS-232 cable Delta PLC and computer, and then write a program for feedback.Delta plc and pc485 communication protocolYes. First confirm that the programming cable and driver are normal, and connect the communication cable to Delta PLC. Use a USB-to-RS-232 cable to connect it to a programming computer. Open Delta PLC's program, click "Online Mode", select the correct communication port in the WPLSoft software, and then click Automatic Detection.

The PLC does not need to write programs, just set the PC serial port to 9600, 7, e, 1, ascii.

The setting steps for Delta PLC series ES/EX2/SX2 on the computer are as follows: Determine the communication method: First of all, you need to determine whether you are using RS232 communication or RS485 communication. If it is RS232 communication, connect it to the COM1 port of the PLC; if it is RS485 communication, connect it to the COM2 port of the PLC, and you may need to use a conversion module to convert USB to 485 communication. Install and open WPL software: Install Delta's WPL programming software on your computer.

As a novice, I first came into contact with 485 communication. I only knew that I needed to use 485 communication based on my needs and knew nothing about the principle. After two weeks of challenges, I finally completed it, physically and mentally exhausted. The following case illustrates the actual operation process: The customer uses Delta PLC to communicate with the ammeter 485 to read the current value. First confirm the brand of the ammeter, connect the line, and obtain the communication protocol. Key information in the protocol includes baud rate, stop bits, data bits and parity.

Delta plc uses 458 communication (Xiaobai can understand)

Customers use Delta PLC to communicate 485 with ammeter to read the current value. First confirm the brand of the ammeter, connect the line, and obtain the communication protocol. Key information in the protocol includes baud rate, stop bits, data bits and parity. Take 9600bps and no parity in the stop bit data bit as an example, and the corresponding communication format is H89. After selecting the corresponding communication format, use com2 to conduct 485 communication. Communication format and signal transmission are key steps.

The brief steps for Delta PLC to use 485 communication are as follows: Confirm equipment information: Confirm ammeter brand in order to obtain the correct communication protocol. Line connection: Connect Delta PLC and ammeter on a 485 communication line according to the requirements of the communication protocol. Set communication parameters: Set communication parameters in the PLC, including baud rate, stop bit, data bit and parity. These parameters should be consistent with the communication protocol of the ammeter.

First use the USB to RS-232 cable Delta PLC and computer, and then write a program for feedback. First confirm that the programming cable and driver are normal, and connect the communication cable to Delta PLC. Use a USB-to-RS-232 cable to connect it to a programming computer. Open Delta PLC's program, click "Online Mode", select the correct communication port in the WPLSoft software, and then click Automatic Detection.

Information about Delta PLC's communication RTU mode is as follows: Communication protocol settings: In Delta PLC, if a communication program has been written, the D1120 register is usually used to set the 485 communication protocol. This means that in order to successfully communicate 485 with WPL, you need to ensure that the protocol set by the communication program in the PLC matches the protocol expected by WPL.

Delta PLC's 485 communication issues

1. The customer uses Delta PLC to communicate 485 with the ammeter to read the current value. First confirm the brand of the ammeter, connect the line, and obtain the communication protocol. Key information in the protocol includes baud rate, stop bits, data bits and parity. Take 9600bps and no parity in the stop bit data bit as an example, and the corresponding communication format is H89. After selecting the corresponding communication format, use com2 to conduct 485 communication. Communication format and signal transmission are key steps.

2. The brief steps for Delta PLC to use 485 communication are as follows: Confirm equipment information: Confirm the ammeter brand in order to obtain the correct communication protocol. Line connection: Connect Delta PLC and ammeter on a 485 communication line according to the requirements of the communication protocol. Set communication parameters: Set communication parameters in the PLC, including baud rate, stop bit, data bit and parity. These parameters should be consistent with the communication protocol of the ammeter.

3. Delta PLC's 485 communication is based on the RS-485 standard and uses Modbus RTU protocol to achieve stable and long-distance data exchange between multiple devices. Protocol core: Modbus RTU Delta PLC's 485 communication usually uses Modbus RTU protocol, which is a serial communication protocol widely used in industrial automation. It adopts a master-slave architecture. The master station equipment initiates requests and the slave station equipment responds. The structure is simple and open, and it is easy to integrate into different systems.

4. The CN3 interface of Delta's ASDA-B2 servo driver realizes RS485 communication with Siemens S7 - 200 PLC Port0 port. The core is the positive terminal (+) to the positive terminal of the differential signal, the negative terminal (-) to the negative terminal, and the signal ground is shared., and the shielding and terminal matching are made to ensure stable and reliable communication. The following describes the entire process of interface definition, pin correspondence, wiring practice, parameter configuration, and troubleshooting in detail.

5. Use the SET command or RST command to set or reset the relevant special relay, such as M1120 (communication setting hold), M1143 (ASCII/RTU mode selection), etc. Then there are the instructions RS (free message), MODRD (modbus read data), MODRW (modbus read data), and MODWR (modbus data write) for RS485 communication.

6. Possible reasons are: RS-485 wiring is incorrect; the communication format and communication rate settings of the master and slave stations are inconsistent. You should do the following: check the wiring; return the master and slave stations to the factory values, and then reset the communication format and communication rate (D1120) Slave station procedures: only need to set the communication format and communication rate, and be careful to keep it consistent with the master station.

Example tutorial of RS485 serial communication between Delta PLC and upper computer

Tools and raw material preparation hardware: computer, Delta PLC (such as DVP14SS2), USB to RS232 data cable, RS232 to RS485 module (or USB to RS485 integrated module). Software: Delta PLC programming software WPLSoft, serial debugging assistant (for upper computer testing).

Customers use Delta PLC to communicate 485 with ammeter to read the current value. First confirm the brand of the ammeter, connect the line, and obtain the communication protocol. Key information in the protocol includes baud rate, stop bits, data bits and parity. Take 9600bps and no parity in the stop bit data bit as an example, and the corresponding communication format is H89. After selecting the corresponding communication format, use com2 to conduct 485 communication. Communication format and signal transmission are key steps.

According to the requirements of the communication protocol, Delta PLC and ammeter were connected on a 485 communication line. Set communication parameters: Set communication parameters in the PLC, including baud rate, stop bit, data bit and parity. These parameters should be consistent with the communication protocol of the ammeter. Select communication format: Select the corresponding communication format in the PLC according to the communication format in the communication protocol. Configure communication ports: Use the specific communication port of the PLC for 485 communication.

The hardware connection step powers the PLC and HMI. Use the prepared serial cable to connect the RS485 port of the PLC and the communication port of the HMI. The connection diagram is as follows: Programming and debugging station number setting The communication station numbers of PLC and HMI must correspond one by one, otherwise communication failure will be caused. Set the station number (such as station number 1) in the PLC program and match the same station number in the HMI configuration interface.

MCGS can communicate with Delta PLC and realize data interaction through the MODBUS protocol. Communication principle MCGS serves as upper computer software to establish a physical connection with Delta PLC through serial port (RS485) or Ethernet, and uses MODBUS-RTU/ASCII protocol (default slave mode) to read and write data. To enable RTU mode, turn the M1243 register of Delta PLC ON.

Delta plc485 communication protocol

1. Delta PLC's 485 communication is based on the RS-485 standard and uses Modbus RTU protocol to achieve stable and long-distance data exchange between multiple devices. Protocol core: Modbus RTU Delta PLC's 485 communication usually uses Modbus RTU protocol, which is a serial communication protocol widely used in industrial automation. It adopts a master-slave architecture. The master station equipment initiates requests and the slave station equipment responds. The structure is simple and open, and it is easy to integrate into different systems.

2. Terminal resistance: Both ends of the RS485 bus (PLC end and the last servo end) need to be connected to a terminal resistance of 120Ω (matching the characteristic impedance of twisted pairs), but no intermediate equipment is connected; the DP bus connector of the S7 - 200 PLC has its own terminal resistance switch, which can be turned to "ON"; Delta B2 servo needs to be connected to an external 120Ω resistor between the 6 pins of CN3.

3. The S7-1200 PLC can control Delta servo motors through RS485 communication. The core is to match the communication protocol and complete hardware wiring and parameter configuration.

4. The definition of Delta PLC communication ports varies according to different series. The core conclusions are as follows: ES2/EX2/SA2/SX2 series COM1 port: adopts RS-232 protocol and can be used as a master station or a slave station. It is mainly used for program editing, with a maximum communication distance of 15 meters and a baud rate range of 110 to 115200bps. COM2 port: Supports RS-485 protocol, has both master and slave station functions, and has a higher baud rate limit, reaching 921,000 bps.

5. It can realize RS485 serial communication between Delta PLC and upper computer. If you encounter problems, you can refer to the WPLSoft help document or adjust communication parameters and try again.

Delta PLC Communication RTU Mode

1. Relevant information about Delta PLC's communication RTU mode is as follows: Communication protocol settings: In Delta PLC, if a communication program has been written, the D1120 register is usually used to set the 485 communication protocol. This means that in order to successfully communicate 485 with WPL, you need to ensure that the protocol set by the communication program in the PLC matches the protocol expected by WPL.

2. MCGS can communicate with Delta PLC, specifically realizing data interaction through the MODBUS protocol. Communication principle MCGS serves as upper computer software to establish a physical connection with Delta PLC through serial port (RS485) or Ethernet, and uses MODBUS-RTU/ASCII protocol (default slave mode) to read and write data. To enable RTU mode, turn the M1243 register of Delta PLC ON.

3. Protocol core: Modbus RTU Delta PLC's 485 communication usually uses Modbus RTU protocol, which is a serial communication protocol widely used in industrial automation. It adopts a master-slave architecture. The master station equipment initiates requests and the slave station equipment responds. The structure is simple and open, and it is easy to integrate into different systems.

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