Seal-In Circuits: Start/Stop with a Holding Contact, Scan by Scan
This lesson is part of the course
In this lesson
You run a toy conveyor motor through 12 scans of start and stop presses: first without a holding contact, then as a reset-dominant and a set-dominant seal-in, and count where the two versions disagree.
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Lessons in this course
- Contacts and Coils as 0/1 Cells: Normally Open, Normally Closed, Series & Parallel Locked
- Seal-In Circuits: Start/Stop with a Holding Contact, Scan by Scan Locked
- The Scan Cycle: Read Inputs, Solve Rungs, Write Outputs & the One-Scan Delay Locked
- Edge Detection: Rising and Falling Edges, One Count per Press Locked
- Timers: On-Delay, Off-Delay and Retentive, Milliseconds per Scan Locked
- Counters: Up/Down Counting on Edges, Reset, Box Presets and Wrap-Around Locked
- Step Sequences: A Mixing-Tank Cycle as Numbered Steps and Transitions Locked
- Capstone – Alarms & Permissives: Latch, Acknowledge, First-Out and a State Chart Locked