Do-More ALHILO - High Low Alarm PLC Instruction

The High / Low Alarm instruction (ALHILO) monitors the Input and sets the appropriate alarms based on the alarm limit values. The alarm states are inclusive. The High-High Limit and High Limit alarms will be ON when the input value is greater than or equal to the High-High Limit. The Low Limit and the Low-Low Limit alarms will be ON if the input value is less than or equal to the Low-Low Limit. When entering the alarm limit values, ensure that the High-High Limit value is greater than the High Limit value, which must be greater than the Low Limit value, which must be greater than the Low-Low Limit value. When designating the alarm bits, ensure that all references are unique. When the ladder status is ON, the top section shows the input value, the four-alarm limits, and their corresponding alarm output BITs. The bottom section displays two "mini-trends" and graphically shows the instruction's values. The mini-trend display can be disabled in the View - Options menu; select the Ladder tab, then uncheck the Show Trend Status selection. Note: Each of the Limit / Alarm pairs is optional. Leave both fields empty to indicate that Limit is not being used. 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)