Shared ladder program
Ladder logic: 3 rungs with rising-edge, CMP, XIC
A runnable ladder logic program with 3 rungs using rising-edge, CMP, XIC, CTU, OTE, RES. Open it in the free browser PLC simulator to edit, run and fork it. No install, no account.
What's in this program
- 3 rungs
- 2 timers
- 1 counter
- 2 data registers
- Uses a compare instruction
Instructions used: rising-edge (one-shot rising-edge contact), CMP (compare instruction), XIC (examine-if-closed contact (normally open)), CTU (count-up counter), OTE (output energise coil), RES (reset a timer or counter).
Edit & run it live
More example programs
Start/Stop motor with seal-in
The classic latching start/stop circuit. A momentary start button energises the motor, a parallel branch off the motor output seals the rung in, and a normally-closed stop button drops it out.
On-delay fan start (TON)
A run command starts an on-delay timer; once the preset elapses, the fan output turns on. A textbook TON example showing how the Done bit gates a downstream coil.
Want to build your own? Open the free ladder logic sandbox.
