GE PACSystems RX3i User Manual page 57

Power sync and measurement system

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Status/Alarm Timing

GFK-2749

Timing A – The PSM buffers an entire power line cycle and takes 11ms to perform

calculations on the waveforms. The new status bits are available to the application code

after the next PLC input data scan.

Total latency = 1-cycle + 11ms + (0 to PLC scan time)

Update rate = 1-cycle or the PLC scan rate (whichever is longer)

Timing B – The PSM updates this information every 100ms. The new status bits are

available to the application code after the next PLC input data scan.

Update rate = 100ms or the PLC scan rate (whichever is longer)

Timing AB – AllGridAlarmsOK follows the timing of the alarm that causes it to be cleared

or set.

Chapter 3 Configuration and Data Transfer

3-13

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