First Factory Project — Two-Station Conveyor
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Briefing
Turn the AND and OR logic you just learned into a working dispatch conveyor. Operators at either end can request the belt; a shared LINE_READY signal must permit both stations. Build two short rungs, watch cartons move, then prove all eight input combinations. This is a hold-to-run training cell: releasing both requests stops the belt. No timers, counters or latches are needed.
Objectives
- Either STATION_A or STATION_B runs the conveyor while LINE_READY is on
- Both stations can request the belt together
- LINE_READY off stops the conveyor regardless of either station
- Releasing both requests stops the belt; the command must not latch
Hints
- Start with your OR lesson: put STATION_A and STATION_B on parallel branches.
- The first rung writes REQUEST from the two parallel stations. On the second rung, put REQUEST and LINE_READY in series to drive CONVEYOR_RUN.
- Use a normal output coil for CONVEYOR_RUN. The requests are held signals, not start pulses.
- In live I/O, enable LINE_READY and then try each station. Turn LINE_READY off while a request remains on.
I/O Table
Inputs
STATION_ADispatch station A — held request
BOOL · %I0.0
STATION_BDispatch station B — held request
BOOL · %I0.1
LINE_READYShared production-ready permit
BOOL · %I0.2
Outputs
CONVEYOR_RUNDispatch conveyor motor command
BOOL · %Q0.0
Your program will be tested against:
All test cases run automatically when you submit. Assertions are hidden until you pass.
- #1A off · B off · ready off
Both stations share the line-ready permit.
- #2A on · B off · ready off
Both stations share the line-ready permit.
- #3A off · B on · ready off
Both stations share the line-ready permit.
- #4A on · B on · ready off
Both stations share the line-ready permit.
- #5A off · B off · ready on
Both stations share the line-ready permit.
- #6A on · B off · ready on
Both stations share the line-ready permit.
- #7A off · B on · ready on
Both stations share the line-ready permit.
- #8A on · B on · ready on
Both stations share the line-ready permit.
- #9Release requests and interrupt the permit
A working command must also stop correctly without latching.
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