GE VMIVME-5588DMA Gas turbine interface card

The totalizer is always active in period/rate and continuous rate modes. To access the values, the BTR length must be changed to a value between 20 and 26 in multiples of 2. A length of 20 will return the total count for C0, a length of 22 will return the total count for C1 and C0, and so on. A BTR length of 0 will still return 18 words. The reset bits will now reset the total count in words 19-26. The count will continue to accumulate until 999,999 and then rollover to zero. The presets and rollover in the BTW are inactive When using the reset, you can always be off by (1–scaler). For example, with a scaler of 8 after issuing a reset, you may have only 1 pulse occur, but your count may immediately go to 8, making you off by 7 counts. Also, if you dynamically change the scaler, your count can be off by the larger of the new or old scaler, and changing the scaler will reset the count to 0.

Period/Rate and Continuous/Rate Examples

The total count value will be updated every scaler number of pulses at the gate/reset pin. The maximum allowable input frequency for the total count to be accurate varies with module configuration and the scaler by about 340–520Hz times the scaler. For example, the best case is with only 1 channel operating in period/rate or continuous/rate modes For example, the worst case is with all 4 channels operating in period/rate or continuous/rate modes.The above is only true if you are not doing BTWs, the BTW length is less than 3, or the data in the BTW does not change for any counter.

When doing BTWs 

whose length is greater than 3 or if the BTW data changes, the potential to miss pulses is limited to (number of pulses in 6ms – scaler) every time there is a transition of BTW data if the number pulses that occur in 6ms is greater than scaler. If the number of pulses that occur in 6ms is less than the scaler, the count will remain accurate. There is no minimum limit to the input pulse width as long as no more than the scaler number of pulses appear in (1/above allowable input frequency) seconds. It is important to note that even if the above frequency is exceeded the 4MHz count and frequency will still be accurate. Only the total counts returned will be unreliable.

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