3. Timer Design Examples 3.7 Burn-in Test System (Timing Extension) X0 Control Purpose: z Warning the operator to take out PLC from the burn-in room by the test completed indicator after 2.5 hours burn-in process. X0 3000 s T0 3000 s T1 T2 3000 s Y0 (3000+3000+3000)s Devices: DVP-PLC Application Examples 3-9 Y0 Device Function X0 When X0 = ON, the burn-in test starts T0 3,000 sec timer. Time base: 100ms T1 3,000 sec timer. Time base: 100ms T2 3,000 sec timer. Time base: 100ms Y0 Burn-in test completed indicator