Do-More ALRATE - Rate of Change Alarm

The Rate of Change Alarm instruction (ALRATE) monitors how quickly the value changes in a numeric memory location and sets alarm bits if the value has changed more rapidly than a specified amount. Input is the numeric memory location to monitor. This can be any readable numeric memory location. Sample Time is the frequency (in milliseconds) at which the comparison between the Input value and the Rate Limit is made. The Sample Time can be any positive integer constant value or readable numeric memory location. The rate Limit is the maximum allowable charge of the Input value from one sample time to the next. The Rate Limit can be any constant value or readable numeric memory location. Positive Alarm (if selected) selects the bit location to turn ON if the Input value has increased by more than the Rate Limit since the last Sample Time; otherwise, the bit will be turned OFF. This can be any writable bit location. Negative Alarm (if selected) selects the bit location to turn ON if the Input value has decreased by more than the Rate Limit since the last Sample Time; otherwise, the bit will be turned OFF. This can be any writable bit location. 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)