GE VMIVME-7664 Gas turbine circuit module

Use the rate measurement mode to count incoming pulses for a user-specified time interval. At the end of the interval, the module returns a value representing the sampled number of pulses and a value indicating the incoming frequency. When the count and frequency are updated, any associated outputs are checked against their associated presets.The value representing the sampled number of pulses is returned in BTR words 3 thru 10, and the value indicating the incoming frequency is returned in words 11-18. The total count equals the number of pulses received during the sample period. The operation of rate measurement mode is shown below in 1.10.

You would read 60 Hz as the frequency 

in the Block Transfer Read file (words 11 and 12). Words 3 and 4 would contain the value 3. Since the default configuration for the VHSC module is the Counter mode, the user must select the rate measurement mode through the block transfer write initialization file. This is done by setting the appropriate bits in words 3 and 4 of the block transfer write initialization file (chapter 4). If frequency exceeds 500KHz, the number 999,999 is returned.

Sample Period 

You can set the sample period used in the frequency calculation in the rate measurement mode. Allowable values are 10 milliseconds to 2 seconds in 10 millisecond increments. The default value is 1 second. (Note: A 0 in the BTW initialization word is equivalent to the default value of 1 second.) The sample period is set in words 21 through 24 of the BTW initialization file (chapter 4). Connection to Counter Inputs The only user connections used in the rate measurement mode are to phase A of the module. The gate/reset and channel B terminals are not used in this mode.

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