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ladder·IEC 61131-3·industrial, logistics·complexity 3/3·since v0.1.0

Conveyor interlock chain

Three-rung ladder logic for a downstream-first conveyor start sequence with jam permissives and an alarm latch.

For the controls engineer

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ladder·§ IEC 61131-3
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Conveyor Interlock Chain PLC ladder logic diagram with 3 rungs Conveyor Interlock Chain Rung 001 — Run downstream conveyor first — Rung 002 — Start upstream only when downstream is running — Rung 003 — Latch jam alarm — Auto mode AUTO_MODE BIT 1.0 E-stop not tripped ESTOP_OK BIT 1.1 Downstream jam clear CV2_JAM IN 2.2 Conveyor 2 run CV2_RUN OUT 4.1 Auto mode AUTO_MODE BIT 1.0 CV2 running CV2_RUN OUT 4.1 Upstream jam clear CV1_JAM IN 2.1 Conveyor 1 run CV1_RUN OUT 4.0 CV1 jam CV1_JAM IN 2.1 CV2 jam CV2_JAM IN 2.2 S Jam alarm JAM_ALARM BIT 3.0
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Scenario

Conveyors are started downstream-first so a running upstream belt never feeds material into a stopped downstream belt. This example shows the interlock directly in the rungs: conveyor 1 cannot run until conveyor 2 is already commanded on.

Annotation key

Ladder syntax →