Status/Alarm Timing
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.
PSM Signal Input Data
The PSM module reports its analog data in 16-bit integer, pseudo-actual values. The integer
values are a fixed power of 10 offset from the actual measured value at the Terminal
Assembly. The following table lists the units of measure of each type of signal. (For example,
voltage is reported in 0.1V units, so a voltage reading of 1256 = 125.6V.)
Units of Measure
To Next Page
Loading...
