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> Ab allen bradley 1771-vhsc series a 1771VHSC
Ab allen bradley 1771-vhsc series a 1771VHSC
AB ALLEN BRADLEY 1771-VHSC SERIES A 1771VHSC Very High Speed Counter Module
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 modules memory
to a designated area in the processor data table. It also moves
configuration words from the processor data table to the module
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 processors data table on request. Command and
configuration data is sent from the programmable controller data
table to the module with a BTW instruction.
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.
* 4 input channels configurable for encoder mode, counter mode,
* period/rate mode and continuous/rate mode
* outputs are current-sourcing at 5 to 24V dc (2A maximum per
* single-ended or differential inputs
* 2-phase encoder inputs up to a frequency of 250KHz
* single-phase counter inputs up to a frequency of 1MHz
* input voltage range of 5 to 24V dc
* returns in status either count or frequency in binary or BCD
* input counts as high as 999,999
* up to 500KHz in period/rate or rate measurement frequency
* outputs can be tied to any counter
* each output has a user-selectable on-off value
* outputs can be tied back to an input for cascading
* automatic default configuration
* each counter has a user-selectable preset and rollover value
* period/rate w/periodic outputs and period/rate w/dynamic outputs
* can be used for totalization
* The 1771-VHSC module operates in the following modes:
* rate measurement frequency mode
Item is like new/never used in the original opened box.
