Runnable simulator field guide
Boiler startup PLC scenario: test checklist
Direct answer
The learner can define every state and proof, retain first-out trip evidence and prevent reset or power return from producing an unintended start.
Written for process-control learners sequencing a bounded educational boiler model from available conditions through purge and firing permission.
Scenario setup
Educational boiler boundary, water level, pressure and temperature state, draft or airflow proof, fuel availability, purge sequence, ignition permission, flame proof, trips, first-out, reset and restart authority.
I/O and state map
Start request through permissives, fan command, airflow proof, timed purge, ignition and fuel permission, flame evidence, heating state, trip response and shutdown feedback.
Normal run
The model reaches firing state only after every declared proof and returns to a defined safe stopped state for each simulated trip.
Boundary run
Low water, no airflow, purge timeout, ignition failure, flame loss, high pressure, sensor bad quality, simultaneous trips, reset held and controller restart.
Injected fault
A requirement, permissive, sequence, timer, output, final element, proof, trip, first-out, reset or restart mismatch.
Target check
The actual combustion system engineered, commissioned and proof-tested by qualified specialists under current codes and manufacturer requirements.
What should a boiler startup sequence check?
A real design checks the approved water, pressure, airflow, fuel, valve, purge, ignition, flame and trip conditions in the required order; exact requirements are system-specific.
Why preserve first-out boiler trip evidence?
Many downstream conditions change during shutdown, so the first initiating cause is valuable for diagnosis and controlled recovery.