How Does a PLC Process Ladder Logic?

How Does a PLC Process Ladder Logic? A PLC will utilize a cyclic scan. Part of this scan is solving the logic. Logic is solved from left to right, top to bottom. The conditions on the previous rung are available to the next rung. We use the free, fully functional Do-More Designer PLC software and simulator. The first rung will look at input X0 and turn on Y0. Rung two will look at the normally closed X1 and set input bit X0. X0 on rung three will now control the following output of Y1. You can see that within the scan of the logic, we can change the status of the memory bits with our ladder logic. 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)