GE PACSystems RX7i Cpu Programmer's Reference Manual

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GE PACSystems RX7i Cpu Programmer's Reference Manual Manual pdf 340 page image

Chapter 6. Service Request FunctionGFK-2950C February 2018 3256.27 SVC_REQ 29: Read Elapsed Power Down TimeUse SVC_REQ 29 to read the amount of time elapsed between the last power-down and the mostrecent power-up. If the watchdog timer expired before power-down, the CPU is not able to calculatethe power down elapsed time, so the time is set to 0.This service request cannot be accessed from a C block.This function has an output parameter block only. The parameter block has a length of three words.Address Power-down elapsed seconds (low order)Address + 1 Power-down elapsed seconds (high order)Address + 2 100μS ticksThe first two words are the power-down elapsed time in seconds. The last word is the number of100 μs ticks in the current second.Note: Although this request responds with a resolution of 100 μS, the actual accuracy is 1 second.The battery-backed clock, which is used when the controller is powered down, is accurate towithin 1 second.SVC_REQ 29 ExampleWhen input %I0251 is ON, the elapsed power-down time is placed into the parameter block thatstarts at %R0050. The output coil (%Q0001) is turned on.CONST00029SVC_REQFNCPARM%R0050%I0251 %Q0001