Allen Bradley PLC-5 1771-VHSC | Very High-Speed Counter Module

Product Description

The Allen Bradley PLC-5 1771-VHSC Very High-Speed Counter Module is engineered for applications requiring rapid and precise counting. With a maximum input frequency of 1 MHz, this module supports high-speed digital inputs and outputs, making it ideal for motion control, position tracking, and other time-critical automation tasks. It integrates seamlessly into PLC-5 systems and requires no external power supply.

Technical Specifications

• Model / Part Number 1771-VHSC

• Manufacturer Allen Bradley (Rockwell Automation)

• Product Line PLC-5 Series

• Product Type High-Speed Counter Module

• Weight 1.00 lbs (0.45 kg)

• Inputs 12 digital inputs (3 per counter)

• Outputs 8 digital outputs

• Max Input Frequency 1 MHz (counter mode)

• Module Update Period 100 µs

• Backplane Current Consumption 0.65 A

• Signal Delay

• DC Off: 30 ms ± 7 ms

• AC Off: 29 ms ± 8 ms

• Slots Required 1 slot

• I/O Connection Hardware 1771-RTP1

• Wiring Arm 1771-WN

• External Power Requirement None

• Mounting Rack mountable

Application Scenarios

• High-speed counting in packaging and assembly lines

• Position and motion tracking in robotics and CNC systems

• Industrial automation requiring rapid digital input/output processing

FAQ

Q: What is the maximum input frequency supported?  A: Up to 1 MHz in counter mode.

Q: How many inputs and outputs are available?  A: 12 digital inputs and 8 digital outputs.

Q: Does the module require external power?  A: No, it operates entirely from backplane power.

Q: What wiring hardware is compatible?  A: The 1771-RTP1 connection hardware and 1771-WN wiring arm.

Comparison with Similar Models

• 1771-VHSC: Very high-speed counter, 1 MHz input frequency, 12 inputs, 8 outputs

• 1771-HSC: Standard high-speed counter, lower frequency range

• 1771-IFE: Analog input module, designed for voltage/current signals rather than counting