GE VMIVME-7697-550 Gas turbine circuit module

The VHSC module has 8 outputs, isolated in groups of 2. Each of the outputs is capable of sourcing current and will operate between 5 and 24 volts dc. You must connect an external power supply to each of the outputs. The outputs can source 2 amps dc. The outputs are hardware-driven and will turn on in less than 10µsec when the appropriate count value has been reached.

Enabling and Forcing Outputs 

Outputs may be forced on or off independent of count or frequency value. To force the outputs, they must first be enabled. Enabling the outputs is done through a data table word 2, bits 0-7 in the BTW initialization file (chapter 4). Once the outputs have been enabled, they may be forced on by setting bits 8-15 in word 2 of the BTW initialization file. The outputs can be forced off by setting the enable bit to 0.

Assigning Outputs to Counters

 By setting bits in the block transfer write initialization file, you can assign the outputs on the module to any of the various counters. You can assign as many as 8 outputs to a given counter. However, an output may be assigned only once to a counter--it is not possible to use the same output with 2 different counters. Refer to words 25, 30, 35, 40, 45, 50, 55, 60 of the BTW initialization file in chapter

In the rate measurement mode

the On and Off values associated with each output represent a frequency value instead of a count value. The maximum frequency value which may be entered in an On or Off value is 500,000Hz. Refer to 1.11.Refer to 1.12. Using output 0 as an example, when the value in words 26 and 27 is less than the value in words 28 and 29, the output turns on at 2000 and off at 5000. If the value in words 26 and 27 is greater than the value in words 28 and 29, the output turns off at 2000 and on at 5000.

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