GE VMIVME-7486 Gas turbine counting module

For a list of publications with information on Allen-Bradley programmable controller products, consult our publication index SD499.

This chapter gives you information on:

• features of the VHSC module

• how the module communicates with programmable controllers. 

• how the module operates

The VHSC module is a single-slot module that does not require an external power supply. (Note: The outputs do require a power supply.) After scanning the inputs and updating the outputs, the input data is converted to a specified data type in a digital format to be transferred to the processor’s data table on request. Command and configuration data is sent from the programmable controller data table to the module with a BTW instruction.

Module Description

The VHSC module performs high speed counting for industrial applications. The module is an intelligent block transfer I/O module that interfaces signals with any Allen-Bradley programmable controller that has block transfer capability. Block transfer programming moves module status data from the module’s memory to a designated area in the processor data table. It also moves configuration words from the processor data table to the module memory

Features of the Module 

The VHSC module counts pulses from encoders (such as Allen-Bradley Bulletin 845H, K, F, P, E and L), pulse generators or mechanical limit switches, proximity switches, etc. and returns either a count or frequency in binary or BCD format. The module’s features include: • 4 input channels configurable for encoder mode, counter mode, period/rate mode and continuous/rate mode • 8 outputs, isolated in groups of 2 • outputs are current-sourcing at 5 to 24V dc (2A maximum per output)

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