Flasher

Step by step

Pick a step. The rungs are drawn by the editor after Core scans the program up to that step.

Why it works

• Rung 0: OnTime times while Enable is on and OffTime is not done.
• Rung 1: OffTime starts when OnTime is done.
• Rung 2: Lamp is on while OnTime is still timing, so it turns off when OnTime is done.
• When OffTime is done, XIO OffTime.DN breaks rung 0. OnTime resets, which breaks rung 1, so OffTime resets in the same scan. OnTime starts again on the next scan.
• Each step here is one scan, 600 ms apart.

Common mistakes

• One timer resetting itselfA TON with XIO on its own DN resets on the scan after it is done, so DN is on for one scan only. Use two timers when the on and off times matter.
• A fixed one-second blinkSystem_Clock_1s already blinks once a second. Use XIC System_Clock_1s when the times do not need setting.

Instructions used

• Normally open contact
• Normally closed contact
• On-delay timer
• Output coil

Related

• On-delay timer
• Delay on and delay off