Shared ladder program

Ladder logic: 4 rungs with XIC, rising-edge, RTO

A runnable ladder logic program with 4 rungs using XIC, rising-edge, RTO, OTL, RES, OTU. Open it in the free browser PLC simulator to edit, run and fork it. No install, no account.

Open a blank sandbox
RUNG 1Conv_Motor_RunFBRTO Gearbox_RunTimer14400000 msRUNG 2Gearbox_RunTimer.DNPGrease_Alert_OSLGearbox_Grease_DueRUNG 3Gearbox_RunTimer.DNRESGearbox_RunTimerRUNG 4Gearbox_Grease_DueHMI_GreaseAckUGearbox_Grease_Due
Static preview of the shared program. The live editor is below.

What's in this program

XICrising-edgeRTOOTLRESOTU
  • 4 rungs

Instructions used: XIC (examine-if-closed contact (normally open)), rising-edge (one-shot rising-edge contact), RTO (retentive on-delay timer), OTL (output latch coil), RES (reset a timer or counter), OTU (output unlatch coil).

Edit & run it live

Loading the interactive editor…

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.

Batch counter with compare

Each part pulse increments a count-up counter; a compare instruction watches the accumulator and fires a Batch Complete output when it reaches the target. Shows CTU plus a CMP against a constant.

Want to build your own? Open the free ladder logic sandbox.