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

Tank level pump control

Pump control ladder with low-level start, high-level stop, seal-in logic, and a run-delay timer.

For the plant electrician

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ladder·§ IEC 61131-3
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Tank Level Pump Control PLC ladder logic diagram with 3 rungs Tank Level Pump Control Rung 001 — Fill pump seal-in — Rung 002 — Run delay proves flow — Rung 003 — No-flow alarm after delay — Low level LOW_LEVEL IN 1.0 Pump running PUMP_RUN OUT 2.0 High level HIGH_LEVEL IN 1.1 Fault clear FAULT BIT 3.0 Fill pump PUMP_RUN OUT 2.0 Pump running PUMP_RUN OUT 2.0 TON IN=PUMP_RUN PT=5000 name=Flow prove delay FLOW_DELAY Delay done FLOW_DELAY TMR 1.0 Flow switch FLOW_OK IN 1.2 S No flow alarm FLOW_ALARM BIT 3.1
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Scenario

A fill pump starts when the tank reaches low level, stays on through a seal-in path, and stops at the high-level switch. A timer allows a few seconds for the flow switch to prove flow before latching an alarm.

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