GE VMIVME-5651 Gas turbine signal card

The following example demonstrates the operation of the outputs in Continuous/Rate mode of operation. Note that Y = time between incoming pulses trailing edge to leading edge, A = output on value, and B = output off value. The examples shown assume that, at the least, the number of pulses equal to the scalar value is occurring at the gate/reset pin.Note: “Left over” pulses are pulses that occur that are not divisible by the scaler. (i.e. With a scaler of 4, if 6 pulses occur there are 2 “left over” pulses.)

Left over” pulses are pulses that occur that are not divisible by the scaler. (i.e. With a scaler of 4, if 6 pulses occur there are 2 “left over” pulses.)

The 4MHz count, total count

 frequency and new data bit reported to the programmable controller will be updated every scaler number of pulses. And 250–260ms after the last pulses stop, the 4MHz count will go to 999,999, the frequency will go to 0 and the new data bit will be set. The outputs are updated dynamically on the module as the 4MHz count increases. If less than the scaler number of pulses occurs in 250ms, but at least 1/2(scaler) + 1 pulses occur in 250ms, the operation of 4MHz count and frequency will be accurate, but may appear intermittent due to “left over” pulses. The outputs will always update every scaler number of pulses regardless of the update of the 4MHz count.

Examples of Period/Rate and Continuous/Rate

The following waveforms illustrate the difference between period/rate and continuous/rate. All waveforms were initiated by applying a 50Hz signal at the gate/reset terminal of a counter configured for either period/rate or continuous/rate. The output configuration remained constant with an ON value of 20,000 counts and an OFF value of 80,000 counts. Only the scalar mode was varied to show the operation of the two modes.

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