BRX Do-More PLC Modbus ASCII Protocol
Oct 13, 2022
We will now look at the do more plc modbus ascii protocol communication. This will be done through PLC ladder logic sending ASCII characters out the serial port.
More information can be obtained on our website. This includes all of the links mentioned in this video.
https://accautomation.ca/brx-do-more-plc-modbus-ascii-protocol
Modbus is a communication method used for transmitting information over serial lines between electronic devices. The device requesting the information is called the Modbus Master (Client) and the devices supplying information are Modbus Slaves (Servers). This protocol was originally developed by Modicon systems.
Modbus protocol comes in basically three different types. Ethernet (Modbus TCP) or Serial (Modbus RTU or Modbus ASCII). Modbus TCP and Modbus RTU come as standard protocols in the BRX Do-More series of PLCs.
We will connect the BRX Do-More PLC to a Solo process temperature controller. This will be done using the Modbus ASCII protocol over serial RS485 communication wire. (Media) The present and set values (PV / SV) will be read from the Solo controller and the set value will be written when required. Let's get started.
The entire BRX Series PLC can be found at the following location:
https://accautomation.ca/series/brx-do-more-plc/
Here are some of the individual posts with video links:
Installing the Software
https://accautomation.ca/brx-plc-installing-the-software
https://youtu.be/iFI1ebP8Zkk
Establishing Communication
https://accautomation.ca/brx-plc-establishing-communication
https://youtu.be/shU5g8MA8VM
Numbering Systems and Addressing
https://accautomation.ca/brx-plc-numbering-systems-and-addressing
https://youtu.be/-GiKnIDycKY
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