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Function Block Diagram · Fbd

Motor start/stop latch (FBD) — Function Block Diagram

Two-network FBD of the canonical PLC seal-in circuit — start-button rising edge sets a latch, stop and emergency-stop break it. Exercises declared variables, multi-network programs, inline expression notation, and negation bubbles.

Type Function Block Diagram (FBD)Standard IEC 61131-3:2013 §6.4Engine schematex-fbdUpdated 5/26/2026
Motor start/stop latch (FBD)
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The request

“Create an FBD motor control with Start, Stop, and EmergencyStop inputs, a latched run signal, and a MotorOut output.”

Then tryAdd a run-feedback fault timer.Add a manual reset input.
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