Today, let’s talk about how to interface with Delta PLCs via Deltas Modbus ASCII protocol.
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1. Hardwareverbinding
Compatible PLC: DVP Series
The Modbus ASCII protocol uses serial RS232 communication. In this example, the PLC model is DVP-64EH. Simply connect the PLC’s Tx to the gateway’s Rx, Rx to the gateway’s Tx, and GND to GND.
2. PLC-communicatieparameters
Provided by the PLC engineer.
The Delta PLC serial parameters are as follows:
Baud rate: 9600
Data bits: 7
Stop bits: 2
Parity: EVEN
3. Gateway-instellingen
3.1. PLC Connection Settings
Drag a Delta node from the left and double-click to open the settings page. Fill in the configuration according to the PLC’s serial parameters as follows:
Protocol: Select Modbus ASCII
Serial port: Connect TX RX GND and select 232
Baud rate: 9600
Data bits: 7
Stop bits: 2
Parity: EVEN
Communication timeout: 2000
Series: DVP
Station number: 1
3.2. Data Point Settings
In the Delta node’s parameter list, fill in the data points to be read. After completing the data points, the PLC data will be read automatically at the set frequency.
Typically, the PLC engineer provides the data points. After receiving the point list, fill in the data points in the format required by the gateway. The specific correspondence can be referred to:
This is a Yuque content card. Click the link to view:(Je kunt Google Chrome gebruiken voor vertaling)
https://iotrouter.yuque.com/zn3vdn/eg8000/olpfq8b3ohyoetnd
This example reads data from addresses D410 and D710. In the parameter list, sequentially fill in Address/Name/Data Type/Data Length, and set the read frequency to 2 seconds, as shown in the figure:
3.3. Testing
Click Deploy and observe that every 2 seconds, a data entry is printed. The data points read are: D410: 0, D770: 99. Communication successful!
