GE VMIVME-7651 Gas turbine module

Operation of scaler In period/rate mode, the scaler lets the incoming pulse train at the gate/reset pin be divided by a user defined number. Acceptable values for the scaler are 1, 2, 4, 8, 16, 32, 64 and 128. There is one scaler value for each counter. The default value for each scaler is 1. Note: A 0 is equivalent to 1. ! ATTENTION: Sample period times scaler must be less than 0.25 seconds or the counter will overflow without providing an overflow indication. Connection to Counter Inputs The only input to the module in the period/rate mode is made to the gate/reset terminal. The counter inputs (channel A and B) are not used in the period/rate mode.

Continuous/Rate Mode

The continuous/rate mode is similar to the period/rate mode previously described except the outputs in this mode are dynamic outputs. Use this mode to determine the frequency of input pulses by counting the number of internal 4MHz clock pulses over a user-specified number of input signal pulses. Each output is turned on as soon as the turn-on count is reached, and turned off as soon as the turn-off count is reached. As the internal 4MHz clock is counted, the outputs dynamically track the 4MHz count. This allows you to turn an output on a certain number of 4MHz counts after the gate/reset pin goes active, and turn it off a certain number of 4MHz counts later.

1771-VHSC revision B 

later modules count the total number of pulses occurring at the gate/reset pin. This function is frequency-limited. This total count is returned when you request words 19 through 26 in your BTR. You can reset this count by resetting the reset bit (bits 0-4 in BTW word 1). Rollover and preset are inactive. Refer to appendix E for additional information.

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