Machine Learning PLC Integration: Where the Model Runs and What the Controller Owns
The PLC does not run the model. What to publish, how the score returns as an advisory tag with a watchdog, and a pump anomaly detector on CompactLogix.
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Fuzzy Logic PLC Control: Rule Tables, Inference in ST and a Dryer Example
Where fuzzy control beats PID, how to hand-code memberships, a 3×3 rule table and weighted-average defuzzification in Logix ST, with a dryer example.
PLC vs DCS Integration: Getting a Skid onto the DCS
How a packaged skid PLC gets tied into DeltaV, Experion or PCS 7: link protocol, Modbus register map, heartbeat, engineering units and alarm ownership.
Connect a button to the OperShelve tag
OperShelve The alarm instruction only processes the OperShelve tag on transition from cleared to set to prevent unwanted reshelving of the alarm. For example, if an operator presses a push button to shelve the alarm while the ProgUnshelve tag is set, the alarm is not shelved because the ProgUnshelve tag takes precedence. To shelve the … Read more
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