Product Details
Product Description
The 1771-VHSC module delivers very high-speed counting for PLC-5 systems, supporting up to 4 counters with flexible input and output configurations. Designed for precise measurement and fast control, this module handles encoder, switch, and rate measurement signals with selectable filtering. Each output can be independently assigned to any counter channel for complex control applications. Conformal coating and robust isolation ensure reliable operation in industrial environments.
Technical Specifications
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Manufacturer: Allen-Bradley
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Model Number: 1771-VHSC
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Product Type: Very High Speed Counter Module
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Series: PLC-5
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Number of Counters: 4
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Inputs per Counter: 9 (A, B, Gate/Reset)
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Maximum Input Frequency:
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100 Hz (electromechanical switch)
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250 kHz (2-channel quadrature encoder)
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500 kHz (per octave/continuous rate)
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1 MHz (single-channel counter mode)
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Input Voltage: 5V or 12–24V DC, user selectable
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Input Current: 7 mA typical @ 5V; 7–15 mA @ 12–24V; minimum 4 mA
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Number of Outputs: 8
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Output Voltage: 5–24V DC (customer supplied)
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Output Current: 2A per channel, all outputs simultaneously
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Output Switching Time: <10 μs turn-on; 30 μs typical turn-off
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Output Control: Assignable to any counter channel with turn-on/off presets
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Filtering: High-speed or filtered (<100Hz), selectable
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Isolation Voltage: 1500V (input/backplane & output/backplane); 300V between channels
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Power Dissipation: 2–13 Watts
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Thermal Dissipation: 6.8–54.2 BTU/hr
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Backplane Chassis: 1771 Series A or B VD chassis
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Fuse: 7AG 3A Littelfuse 225003
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Environmental Conditions:
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Operating Temperature: 0–60°C (32–140°F)
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Storage Temperature: -40–85°C (-40–185°F)
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Relative Humidity: 5–95% non-condensing
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Mounting: Rack mountable
Key Features
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4 independent high-speed counters for precise measurement
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Versatile inputs: encoder, switch, and rate measurement modes
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Assignable outputs with rapid switching (<10 μs)
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Robust electrical isolation and industrial-grade construction
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Programmable maximum count: 0–999,999
Applications
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High-speed counting in PLC-5 automation systems
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Encoder feedback and motion monitoring
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Rate, frequency, and event counting
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Machine control requiring precise timing and logic outputs
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.