PLC 110 · PLC Control I
Session 7 · Hour 1 · Draw the walk first
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90 minNow Open · 5 min left · next Demo
I show · you follow · check
The lecturer shows once. You copy the same move next.
A step is a bit
Residual air bites. Dump the air. Then the scan.
Name what a stepper bit stands for, and the first safety on air
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Machine. Sequence. Sensors. I/O list. Wires. Then rungs.
Stepper: one move, one bit. Easy to read.
Cascade: groups. Fewer rungs. Harder to see.
Limit ON is the done. Then SET next, RST now.
A+ and A− cannot share a valve moment.
Dump air. Kill electric. Then look.
CheckWrite B+, A+, A−, B−. Map START and S1–S4 to X, solenoids to Y. Step bits M. F3 the walk. Init, cycle, mid-stop, e-stop home. A cylinder that will not step is sensor, step bit, valve, then jam — in that order. Residual air bites.