Industrial Automation & PLC Lab

Build ladder logic, run a PLC against a motor, a tank and a conveyor, and monitor timers, counters and protection.

Ladder logicTimers & countersMotor control

Local session

Contacts (conditions)

Outputs & instructions

A contact goes after the selected element (series) or at the end of the selected rung. For a parallel (OR) condition, select a contact and use “Parallel branch” in Properties. An output goes to the selected rung.

Program

The program saves automatically in this browser.

Supported instruction model

Addresses: I0–I7 inputs, Q0–Q7 outputs, M0–M15 internal bits, T0–T7 timers, C0–C7 counters.
NO, NC, P and N contacts; series and parallel with nested branches.
Coil, SET, RESET, TON, TOF, CTU, CTD, RES. Up to 4 parallel outputs per rung.
A simulated 100 ms scan: read inputs, run rungs top to bottom, write outputs.
Timer resolution is one scan. CTU and CTD on one counter share the accumulator.
STOP turns every output off and keeps memory and counters.

Not supported: math and compare instructions, words and registers, the retentive RTO timer, interrupts, communications, and the other IEC 61131-3 languages. This is a teaching model, not compatible with any vendor’s PLC software.

STOP · 0 scans · 0.0 s

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