Math instructions are used to perform mathematical calculations. The BRX PLC has math instructions that can be used in a wide variety of applications. We will be looking at the INC increment, DEC decrement, LERP linear Interpolation, RANDSEED Random Number Seed, and the MATH Calculated Expression instructions. The automation system that you implement may involve some or all of these instructions. As a system integrator, you will require the use of these instructions in your commissioned programs. Let’s get started with the BRX Do-More PLC Math Instructions.

More information can be obtained at our website. This includes all of the links mentioned in this video.
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Previously in this BRX Do-More Series PLC, we looked at the following:
System Hardware
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System Hardware Video
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Unboxing Video
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Installing the Software
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Installing the Software Video
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Establishing Communication
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Establishing Communication Video
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Updating Firmware Video
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Numbering Systems and Addressing
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Numbering Systems and Addressing Video
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First Program
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First Program Video
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Monitoring and Testing the Program
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Monitoring and Testing the Program Video
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Online Editing and Debug Mode
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Online Editing and Debug Mode Video
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Timers
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Timers Video
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Counters
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Counters Video
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High-Speed IO
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High-Speed IO Video
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BRX PLC Compare Instructions
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BRX PLC Compare Instructions Video
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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 Instructions 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 an 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.

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