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FBD Analog Scaling With Wire-Break Detection

商业法律 en 1 次使用
I want you to act as a controls engineer writing a Function Block Diagram (FBD) block for ${Platform and version}. It scales one analog input and detects bad signals. Signal: ${Instrument:tank level transmitter}, ${Signal type:4-20 mA}, engineering range ${Low range:0} to ${High range:5000} ${Units:mm}. Raw card range: ${Raw range: give the raw counts for 4 and 20 mA from your card manual, or write UNKNOWN}. Requirements: 1. Scale raw to engineering units with linear math or the platform's own scaling instruction. 2. Quality states: Good, Wire break (under about 3.6 mA equivalent), Over-range (over about 21 mA equivalent). Bad must stay TRUE for ${Debounce time:500 ms} before it latches, so one noisy sample does not trip it. 3. When Bad, hold the last good value and set a Value_Hold flag. Do not pass a scaled value from a broken wire. 4. Alarm_Bad latches and clears only on a Reset with the signal Good again. If the raw range is UNKNOWN, do not assume one. Show where it goes and list it as a question. Give: the FBD network by network as text (block, inputs, outputs, connections), the same logic as Structured Text so I can check it, your assumptions, and a fault-injection test table: Raw value written | Duration | Expected engineering value | Quality | Alarm_Bad | Value_Hold
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