PLC to Arduino Modbus rtu communication 

Thank you so much brother

আপনাকে অসংখ্য ধন্যবাদ ভাই l

You are welcome

Hi , Dear Thanks for your comments, how can I help you ? You can connect me via WhatsApp , thanks 👍

you r Welcome

Good morning, ☀️ Yes, it's possible to connect a Delta PLC to other brand PLCs using Modbus communication. Modbus is a widely used communication protocol that allows for interoperability between different brands

To connect two PLCs using Modbus communication, you typically need to follow these general steps: Ensure that both PLCs have Modbus communication capabilities. Check the user manuals for your specific PLCs to confirm this. Determine the communication settings for each PLC, such as baud rate, data bits, parity, and stop bits. The specific settings you need to use may depend on the specific models and brands of the PLCs, as well as the type of Modbus communication you are using (e.g., Modbus RTU or Modbus TCP). Connect the two PLCs using appropriate cabling. For example, if you're using Modbus RTU, you may need to use a serial cable to connect the RS-485 or RS-232 ports of the PLCs. If you're using Modbus TCP, you may need to connect the PLCs to a common Ethernet network. Configure the communication settings on each PLC to match the settings you determined in step 2. Set up the Modbus communication protocol on each PLC according to the instructions in the user manuals. Create or modify your PLC programs to include the necessary instructions for sending and receiving data via Modbus. This may involve using specific Modbus function codes and addressing schemes, which can vary depending on the specific PLCs you are using. Test your Modbus communication to ensure that data is being transmitted and received correctly. It's important to note that the exact steps for connecting two PLCs using Modbus can vary depending on the specific models and brands of the PLCs, as well as the type of Modbus communication you are using. Therefore, it's always a good idea to consult the user manuals for your specific PLCs and follow the recommended procedures for your particular setup.

@@thaque26 Good morning.. I need to know the program of Delta PLC master ..

This program is written using Delta's DVP-SX2 series PLC and the ISPSoft programming software. you can use ISPSoft programming in delta PLC below the 👇 code of example source, example program that uses an RS485 module for communication: MODULE Main VAR // Define the Modbus slave address of the Arduino device SlaveAddr : WORD := 1; // Define variables to hold the current state of two inputs Input1 : WORD; Input2 : WORD; // Define variables to hold the current state of two coils (outputs) Coil1 : WORD; Coil2 : WORD; END_VAR // Define the input registers of the Arduino device REG_INPUT Input1Reg AT %IW0 : WORD; Input2Reg AT %IW1 : WORD; END_VAR // Define the coil (output) registers of the Arduino device REG_COIL Coil1Reg AT %QW0 : WORD; Coil2Reg AT %QW1 : WORD; END_VAR // Define an RS485 communication channel to the Arduino device COMMUNICATION RS485 : COM_TYPE = 'COM1'; PROTOCOL = MODBUS_RTU; PORTNO = 2; // Replace with the appropriate serial port number BAUDRATE = 9600; // Replace with the appropriate baud rate PARITY = 0; DATABITS = 8; STOPBITS = 1; END_COM END_COMMUNICATION // Define a Modbus RTU connection to the Arduino device using the RS485 channel NETWORK MBMaster1 : TYPE = RTU_MASTER; DEVICE = RS485; TIMEOUT = 2000; // Timeout in milliseconds SLAVE_ADDR = SlaveAddr; END_TYPE END_NETWORK // Main program cycle MAIN // Read the current state of the two inputs from the Arduino device MBMaster1.ReadHoldingRegs(0, 2, Input1, Input2); // Update the state of the two coils based on the inputs Coil1 := Input1; Coil2 := Input2; // Write the new state of the two coils to the Arduino device MBMaster1.WriteMultipleCoils(0, 2, Coil1, Coil2); // Delay for 100ms before repeating the cycle DELAY_MS(100); END_MAIN

Below example of WPLsoft I think 🤔 this example helps for you, & Arduino example code you can check my previous reply to others ################## NETWORK 1 TITLE Main Program // Define the Modbus slave address of the Arduino device VAR_GLOBAL SlaveAddr : WORD; Input1 : WORD; Input2 : WORD; Coil1 : WORD; Coil2 : WORD; END_VAR // Define the input and output addresses of the Arduino device VAR_INPUT Input1Addr : WORD; Input2Addr : WORD; Coil1Addr : WORD; Coil2Addr : WORD; END_VAR // Define the RS485 communication channel to the Arduino device VAR RXD : BOOL; TXD : BOOL; DE : BOOL; END_VAR // Define the Modbus RTU master for the RS485 channel VAR MBMaster1 : MB_RTU_MASTER; END_VAR // Initialize the program NETWORK_INIT // Set the slave address and input/output addresses SlaveAddr := 1; Input1Addr := 0; Input2Addr := 1; Coil1Addr := 0; Coil2Addr := 1; // Initialize the RS485 communication channel RXD := FALSE; TXD := FALSE; DE := FALSE; MBMaster1( IN := RXD, OUT := TXD, EN := DE, BAUDRATE := 9600, PARITY := 0, DATABITS := 8, STOPBITS := 1, TIMEOUT := 2000 ); // Set the initial state of the coils Coil1 := 0; Coil2 := 0; END_NETWORK_INIT // Main program cycle NETWORK_MAIN // Read the current state of the two inputs from the Arduino device MBMaster1.MBReadHoldingRegs( SLAVE_ADDR := SlaveAddr, START_ADDR := Input1Addr, REG_CNT := 2, RESULT => [Input1, Input2], ERR => _, BSY => _ ); // Update the state of the two coils based on the inputs Coil1 := Input1; Coil2 := Input2; // Write the new state of the two coils to the Arduino device MBMaster1.MBWriteMultipleCoils( SLAVE_ADDR := SlaveAddr, START_ADDR := Coil1Addr, COIL_CNT := 2, DATA => [Coil1, Coil2], ERR => _, BSY => _ ); // Delay for 100ms before repeating the cycle TON_100MS(); END_NETWORK

Thanks brother

thanks brother ☺️

#include #include // Define the Modbus slave address #define SLAVE_ADDRESS 1 // Define the pins used for RS485 communication #define RS485_RX_PIN 2 #define RS485_TX_PIN 3 #define RS485_DE_PIN 4 // Create a SoftwareSerial instance for RS485 communication SoftwareSerial rs485(RS485_RX_PIN, RS485_TX_PIN); // Create a ModbusSlave instance with the specified address and RS485 configuration ModbusSlave slave(SLAVE_ADDRESS, &rs485, RS485_DE_PIN); // Define variables to hold the current state of two inputs uint8_t input1 = 0; uint8_t input2 = 0; void setup() { // Initialize the RS485 communication with a baud rate of 9600 rs485.begin(9600); // Initialize the Modbus communication with the RS485 interface and the DE pin slave.begin(); // Define two input registers slave.addInputRegister(0); slave.addInputRegister(1); } void loop() { // Read the current state of two inputs (could be digital or analog) input1 = digitalRead(2); input2 = analogRead(A0) / 4; // Update the input registers with the new values slave.setInputRegister(0, input1); slave.setInputRegister(1, input2); // Handle any incoming Modbus requests slave.poll(); }

You should defines three pins for the RS485 module, RX, TX, and DE, and creates a SoftwareSerial instance for communication with the module. The setup() function initializes the RS485 communication with a baud rate of 9600 using rs485.begin(). It then initializes the Modbus communication with the RS485 interface and the DE pin using slave.begin(). The loop() function reads the current state of the two inputs and updates the input registers with the new values using the setInputRegister() method. It also handles any incoming Modbus requests using the poll() method. Note that the specific pin numbers and baud rate used in this example may need to be modified to match the RS485 module you are using. You should refer to the documentation for your specific module for information on the correct pin configuration and baud rate.

This program is written using Delta's DVP-SX2 series PLC and the ISPSoft programming software. you can use ISPSoft programming in delta PLC below the 👇 code of example source, example program that uses an RS485 module for communication: MODULE Main VAR // Define the Modbus slave address of the Arduino device SlaveAddr : WORD := 1; // Define variables to hold the current state of two inputs Input1 : WORD; Input2 : WORD; // Define variables to hold the current state of two coils (outputs) Coil1 : WORD; Coil2 : WORD; END_VAR // Define the input registers of the Arduino device REG_INPUT Input1Reg AT %IW0 : WORD; Input2Reg AT %IW1 : WORD; END_VAR // Define the coil (output) registers of the Arduino device REG_COIL Coil1Reg AT %QW0 : WORD; Coil2Reg AT %QW1 : WORD; END_VAR // Define an RS485 communication channel to the Arduino device COMMUNICATION RS485 : COM_TYPE = 'COM1'; PROTOCOL = MODBUS_RTU; PORTNO = 2; // Replace with the appropriate serial port number BAUDRATE = 9600; // Replace with the appropriate baud rate PARITY = 0; DATABITS = 8; STOPBITS = 1; END_COM END_COMMUNICATION // Define a Modbus RTU connection to the Arduino device using the RS485 channel NETWORK MBMaster1 : TYPE = RTU_MASTER; DEVICE = RS485; TIMEOUT = 2000; // Timeout in milliseconds SLAVE_ADDR = SlaveAddr; END_TYPE END_NETWORK // Main program cycle MAIN // Read the current state of the two inputs from the Arduino device MBMaster1.ReadHoldingRegs(0, 2, Input1, Input2); // Update the state of the two coils based on the inputs Coil1 := Input1; Coil2 := Input2; // Write the new state of the two coils to the Arduino device MBMaster1.WriteMultipleCoils(0, 2, Coil1, Coil2); // Delay for 100ms before repeating the cycle DELAY_MS(100); END_MAIN

Thanks 👍

Yes you can use any value of reading & sending

Thanks 😊

arduino ide

Ji Bhai Arduino diye analog data read kora jabe,

@@thaque26 thanks Bhai.

Sob plc te rs485 nei Bhai. ami siemense plc te korbo kibhabe bolte paren?

Bhai ami plc data k Android show koranor project korchi. Server to Android all ready. But ami siemense plc theke audriono ba esp8266 e db value kikore read korbo bujhte parchina. Can you help me.

Wlc brother

Yes Arduino to PLC on/off possible

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