Product Introduction

The Allen Bradley 1794-VHSC is an intelligent I/O module that interfaces signals with programmable controller that has Ethernet capability. Belonging to the Flex I/O (Bul. 1794) product series, this component type fieldbus I/O is classified as a Specialty Module with a channel type designed explicitly as a High Speed Counter. It serves as a high-density, smart co-processor module that unloads the main PLC or controller CPU from processing extremely fast pulse trains.

ü Power Dissipation (Extended): Maximum 4.0 Watts at 31.2V DC

ü FlexBus Current Consumption (Extended): Typically 5mA at 5V DC

ü Isolation Voltage (Extended): 50V continuous, Basic Isolation Type (Inputs to Backplane)

ü Power Supply Voltage: 24V DC (nominal input window spanning 10.0V DC to 31.2V DC)

ü Operating Temperature: 0 °C to 55 °C

ü Storage Temperature Range (Extended): -40 °C to +85 °C (-40 °F to +185 °F)

ü Relative Humidity (Extended): 5% to 95% (non-condensing)

Real-World Applications

l High-Speed Packaging and Bottling Industries: Positioned on high-speed conveyor lines to interface with incremental rotary encoders. It tracks the exact physical position of bottles or packages at a 1 MHz frequency to trigger precise liquid filling, capping, or pneumatic sorting gates without missing a single count.

l Material Handling and Warehousing Crane Positioning: Integrated within Automated Storage and Retrieval Systems (ASRS) and industrial elevators. It counts high-frequency pulses from motor shafts to track the multi-axis position of robotic cranes, ensuring centimeter-level accuracy when picking up heavy cargo pallets.

l Printing Presses and Paper Mills: Used to synchronize multiple fast-spinning rollers inside massive commercial printing machinery. By reading Z-pulse index channels, it ensures web-tension control and exact alignment of color print layers on fast-moving paper streams.

Catalog

PLC: GE, FANUC, Schneider

DCS: ABB, Siemens, MOORE, Foxboro, Westinghouse, YOKOGAWA

ESD: Triconex, HIMA, Bently Nevada, ICS Triplex

Excitation cards: ABB, GE

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