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
-
Manufacturer: Allen-Bradley
-
Model Number: 1771-VHSC
-
Product Type: Very High Speed Counter Module
-
Series: PLC-5
-
Number of Counters: 4
-
Inputs per Counter: 9 (A, B, Gate/Reset)
-
Maximum Input Frequency:
-
100 Hz (electromechanical switch)
-
250 kHz (2-channel quadrature encoder)
-
500 kHz (per octave/continuous rate)
-
1 MHz (single-channel counter mode)
-
Input Voltage: 5V or 12–24V DC, user selectable
-
Input Current: 7 mA typical @ 5V; 7–15 mA @ 12–24V; minimum 4 mA
-
Number of Outputs: 8
-
Output Voltage: 5–24V DC (customer supplied)
-
Output Current: 2A per channel, all outputs simultaneously
-
Output Switching Time: <10 μs turn-on; 30 μs typical turn-off
-
Output Control: Assignable to any counter channel with turn-on/off presets
-
Filtering: High-speed or filtered (<100Hz), selectable
-
Isolation Voltage: 1500V (input/backplane & output/backplane); 300V between channels
-
Power Dissipation: 2–13 Watts
-
Thermal Dissipation: 6.8–54.2 BTU/hr
-
Backplane Chassis: 1771 Series A or B VD chassis
-
Fuse: 7AG 3A Littelfuse 225003
-
Environmental Conditions:
-
Operating Temperature: 0–60°C (32–140°F)
-
Storage Temperature: -40–85°C (-40–185°F)
-
Relative Humidity: 5–95% non-condensing
-
Mounting: Rack mountable
Key Features
-
4 independent high-speed counters for precise measurement
-
Versatile inputs: encoder, switch, and rate measurement modes
-
Assignable outputs with rapid switching (<10 μs)
-
Robust electrical isolation and industrial-grade construction
-
Programmable maximum count: 0–999,999
Applications
-
High-speed counting in PLC-5 automation systems
-
Encoder feedback and motion monitoring
-
Rate, frequency, and event counting
-
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
Engineering MCC Signal Interface Terminations in Modern Process Automation
Industrial manufacturing plants rely on Motor Control Centers (MCC) to drive critical electrical loads. Plant engineers must interface these MCC motor starters and drives with central control systems. Standardizing the Signal Interface Termination (SIT) architecture ensures seamless command delivery and feedback monitoring between field equipment and process automation platforms.
Layer-2 vs. Layer-3 Network Switches in Industrial Control Systems
Modern factory automation relies heavily on robust Industrial Ethernet communications. Control system engineers deploy managed Ethernet switches to connect programmable logic controllers (PLCs), distributed control systems (DCS), human-machine interfaces (HMIs), and field I/O devices. Selecting between Layer-2 and Layer-3 switching architecture directly impacts network throughput, routing capabilities, and overall cybersecurity defense in operational technology (OT) networks.
Understanding OpenTelemetry in Industrial Automation: Architecture, Observability, and Operational Benefits
Modern industrial control systems (PLCs, DCS, edge nodes) are rapidly adopting cloud-native architectures, generating vast operational data. OpenTelemetry offers an open-source framework that unifies metrics, logs, and execution traces, enabling standardized observability across industrial automation and IT systems.