Optimizing Your Control System with Do-More PLC RANGECHECK: Managing Value In/Out of Range

The Do-More Designer PLC, Value In and Out of Range (RANGECHECK) instruction monitors a numeric input value. It will turn a bit ON or Off based on whether that value is within or outside the specified limits. Analog input WX0 is compared to the High limit of 2500 and the low limit of 1000. The range bit is turned on if the analog input is between these values. In our example, Y0 is used for the range bit. When the ladder status is ON, in addition to the typical status values displayed, the RANGECHECK instruction also displays a small trend that graphically shows the instruction's values. To disable the display of the trend, go to the View | Options menu, select the Ladder tab, then uncheck the Show Trend Status selection. Programming and examples of the BRX Do-More series can be found at this URL: https://accautomation.ca/series/brx-do-more-plc/ There are several reasons why we are using the BRX Do-More 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 uses the same free software. (Do-More Designer) – Integrated simulator in the software capable of external communications for testing