Shared ladder program

Ladder logic: 6 rungs with XIC, rising-edge, XIO

A runnable ladder logic program with 6 rungs using XIC, rising-edge, XIO, OTL, OTU, OTE. Open it in the free browser PLC simulator to edit, run and fork it. No install, no account.

Open a blank sandbox
RUNG 1HydUnit_PressureFaultPPress_Fault_RiseLPress_FaultLatchRUNG 2Press_FaultLatchHMI_FaultAckHydUnit_PressureFaultUPress_FaultLatchRUNG 3Press_FaultLatchHMI_Press_AlarmActiveRUNG 4Press_FaultLatchSys_StartCmdHydUnit_PressureOKLSys_RunningRUNG 5HMI_StopCmdUSys_RunningRUNG 6Sys_RunningHydUnit_PumpOut
Static preview of the shared program. The live editor is below.

What's in this program

XICrising-edgeXIOOTLOTUOTE
  • 6 rungs

Instructions used: XIC (examine-if-closed contact (normally open)), rising-edge (one-shot rising-edge contact), XIO (examine-if-open contact (normally closed)), OTL (output latch coil), OTU (output unlatch coil), OTE (output energise 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.