GE VMIVME-7700-110000 Gas turbine control module

The New Data bit (BTR status word 1, bits 4-7 for counters 0-3 respectively) can be used by the ladder program to indicate that a store register (BTR words 11-18) has been updated by one of the following events: An active gate transition in any of the store count modes The end of the gate sample period in either the period/rate or continuous/rate modes The end of the programmed sample period in rate measurement mode The default mode for the VHSC module is the counter mode for all 4 of the counters. In the default configuration, the module will continuously return counts (0-999,999 binary) to the programmable controller processor. The presets and rollovers associated with each of the 4 counters will not be active, nor will any of the outputs be active.

The ND bit is reset in the ladder program 

by a 0 to 1 transition of the corresponding NDA bit, and then performing a BTW. A BTW length of 1 word can be use for this handshaking procedure. Note: A BTW length of 1 has no effect on the preset or reset bits in BTW word 1, and does not qualify as a configuration BTW. (For example, if the BTW valid bit is set, it will remain set after the BTW with a length of 1 is sent.)

The processor transfers data to and from the module using block transfer write (BTW) and block transfer read (BTR) instructions in your ladder diagram program. These instructions let the processor obtain input values and status from the module, and let you establish the module’s mode of operation

Default Configuration

A default configuration is built into the module. The default configuration is automatically selected on power-up if the user has not configured the module through a Block Transfer Write Initialization file. The module can be placed in the default configuration by writing a block transfer write initialization file with all zeroes to the module.

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