BRX Do-More PLC Serial Communication – Modbus RTU to Solo Controller

We will now look at using serial Modbus RTU to communicate to a Solo process temperature controller using our BRX Do-More Controller. Serial communication instructions will allow you to send and receive serial data to an external device. The communication method that you setup can be ASCII or numeric (binary). ASCII (American Standard Communication for Information Interchange) can be used to send to devices such as a printer or display. Receiving ASCII can be used for connecting barcode scanners to the PLC. The barcode will be read as an ASCII string in the PLC. The BRX Series PLC will allow you to use instructions such as STREAMIN and STREAMOUT to send and receive data from the devices mentioned above. They are usually a one to one device and do not have a protocol. A protocol is like a language used to communicate to different devices connected together. Modbus serial communication (Modbus RTU) is a standard protocol used in many industrial automation devices. The BRX Series PLC has MRX (Modbus Network Read) and MWX (Modbus Network Write) instructions. We will demonstrate these instructions by communicating Modbus RTU to a Solo Temperature Controller. (RS485) Our example will read the current process (PV) value and write the setpoint value (SV) in the controller. Let’s get started. More information can be obtained at our website. This includes all of the links mentioned in this video. https://accautomation.ca/brx-plc-serial-communication-modbus-rtu-to-solo-process-temperature-controller Previously in this BRX Do-More Series PLC, we looked at the following: System Hardware http://accautomation.ca/brx-plc-system-hardware System Hardware Video https://youtu.be/wSYgY09VYeA Unboxing Video https://youtu.be/-Tf8m3BqzPo Installing the Software http://accautomation.ca/brx-plc-installing-the-software Installing the Software Video https://youtu.be/iFI1ebP8Zkk Establishing Communication http://accautomation.ca/brx-plc-establishing-communication Establishing Communication Video https://youtu.be/shU5g8MA8VM Updating Firmware Video https://youtu.be/gsfcGGK4-Sk Numbering Systems and Addressing http://accautomation.ca/brx-plc-numbering-systems-and-addressing Numbering Systems and Addressing Video https://youtu.be/-GiKnIDycKY First Program http://accautomation.ca/brx-plc-first-program First Program Video https://youtu.be/ANSNhdlm_Ao Monitoring and Testing the Program http://accautomation.ca/brx-plc-monitoring-and-testing-the-program Monitoring and Testing the Program Video https://youtu.be/gv3d0vozxac Online Editing and Debug Mode http://accautomation.ca/brx-plc-online-editing-and-debug-mode Online Editing and Debug Mode Video https://youtu.be/77pemu3zXrE Timers http://accautomation.ca/brx-plc-timers Timers Video https://youtu.be/0qU9kgunPi4 Counters http://accautomation.ca/brx-plc-counters Counters Video https://youtu.be/k84VQy8ifgg High Speed IO http://accautomation.ca/brx-plc-high-speed-io High Speed IO Video https://youtu.be/6B5hp_Ri0Ls BRX PLC Compare Instructions http://accautomation.ca/brx-plc-compare-instructions Compare Instructions Video https://youtu.be/CIDVcM0zszE BRX PLC Math Instructions http://accautomation.ca/brx-plc-math-instructions Math Instructions Video https://youtu.be/ZllosAv0DyY Program Control http://accautomation.ca/brx-plc-program-control Program Control Video https://youtu.be/1fewvxxUyW4 Shifting Instructions http://accautomation.ca/brx-plc-shifting-instructions Shifting Instructions Video https://youtu.be/FVTxIl8VKmg Drum Instruction http://accautomation.ca/brx-plc-drum-instruction Drum Instruction Video https://youtu.be/ILokPN1Aadk There are several reasons why we are using the BRX Series Controller. Here are just a few. - Standalone PLC with built in I/O - Built in Data Logging - Communication ability - Ethernet Port, RS232, RS485, USB - support for protocols such as Modbus RTU, Modbus TCP, ASCII, K-sequence (DirectLOGIC users), Custom Protocols (ASCII over serial, TCP or UDP over Ethernet) - Built in Analog input and output - Integrated motion control - High speed counters - Powerful instruction set (Video of Instructons in software) - Ability to expand the system with a variety of modules - Part of the Do-More series of PLCs which use the same free software. (Do-More Designer) - Integrated simulator in the software capable of external communications for testing The BRX series of programmable logic controllers consist of four different units. They differ depending on the Inputs and Outputs built into the unit and if it has the ethernet port. No I/O Micro PLC unit – (BX ME) 10 Point Micro PLC unit – (BX 10/10E) 18 Point Micro PLC unit - (BX 18/18E) 36 Point Micro PLC unit - (BX 36/36E) These CPUs (Central Processing Units) are also known as MPU (Multi Processing Units) because of the communication capabilities. http://www.accautomation.ca