AdvancedRetentive timer~18 min

Service Interval (RTO + RES)

Total ACCUMULATED run-time across any number of stop/starts must trigger a service lamp at 3 seconds. A normal TON forgets on every stop; the retentive RTO remembers until you RES it.

Your goal

  • Every second the machine Runs adds to a total that survives stops.
  • When the accumulated total reaches 3 s, ServiceLamp turns ON and stays on even when stopped.
  • ResetBtn (the 'maintenance performed' button) clears the total and the lamp.
Stuck? Show hints (3)
  1. Rung 1: NO Run → RTO Trt. Watch the ACC bar in Run mode: stop the machine and the bar HOLDS instead of resetting that's the whole difference from TON.
  2. Rung 2: NO Trt.DN → OTE ServiceLamp. RTO's DN stays set even when the rung is false.
  3. Rung 3: NO ResetBtn → RES Trt. RES is the ONLY thing that clears a retentive timer.

Run-hour tracking is exactly how real service intervals work.

I/O for this exercise

Inputs
RunMachine running
ResetBtnService performed reset
Outputs
ServiceLampService due lamp
Timers
Trt · 3000msAccumulated run-time
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