GE VMIVME-5599 Gas turbine interface card

The following are changes made to the 1771-VHSC module in revision B. Period/Rate mode mode has been modified such that if the pulses at the gate/reset stop, the frequency (BTR words 11–18) will go to zero and the 4MHz count (BTR words 3–10) will go to 999,999. Continuous/rate mode has been added. This mode operates identical to period/rate mode with the exception of the outputs. If the frequency is very near (scaler x 2Hz), the most significant digits of the 4MHz count can be greater than 999. This value will be accurate.In period/rate and continuous/rate modes, the smallest frequency returned equals (2 x scaler)Hz. Frequencies less than this will return 0Hz. The frequency will go to 0 and the 4MHz count will go to 999,999 250–260ms after the last pulse. The new data bit will also be set. Words 19 through 26 have added to the BTW.

The outputs, 4MHz count

frequency, and new data bit will be updated on the leading (not inverted) edge of the scaler + 1 number pulse occurring in 250ms. Note: Any previous pulses less than the scaler number that occurred at any time will effect the module update. For example, with a scaler of 4, and applying six pulses every 300ms at the gate/reset terminal, the module will do an update every other burst of six pulses because there are “left over” pulses from the previous burs

r The outputs, 4MHz count, frequency 

 new data bit will be updated on the leading edge (not inverted) of the scaler + 1 number pulse. In all cases, if the incoming pulses stop the 4MHz count will go to 999,999, the frequency will go to 0, the new data bit will be set, and the outputs will be updated accordingly 250–260ms after the last pulse. If the pulses have stopped for more than 250ms the first time that the output should be updated, it will occur within 1.5ms (3ms in BCD) of the actual pulse. The totalized count is updated every scaler number of pulses, but due to “left over” pulses may increment by more than the total number of pulses that occurred. For example, with a scaler of 2 and the gate/reset terminal receiving 3 pulses every 300ms, the total count will increment by 4 every fourth burst of puls

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