1746SC-CTR4 | Allen-Bradley SLC 500 | 4-Channel Counter / Flowmeter Input Module

Product Description

Allen-Bradley Counter / Flowmeter Input Module – Model: 1746sc-CTR4  The 1746sc-CTR4 is a specialized input module for the Allen-Bradley SLC 500 series, designed to handle counter and flowmeter applications. It supports multiple input types including single-ended counters, quadrature encoding, and enable control lines. With high-speed counting capability, selectable filters, and precise accuracy, this module is ideal for industrial measurement and monitoring tasks.

Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Product Line: SLC 500

• Model: 1746sc-CTR4

• Type: Counter / Flowmeter Input Module

• Number of Inputs: 4 differential counter inputs

• Quadrature Encoding: 2 channels supported

• Enable Control Lines: 2 channels

• Input Voltage Ranges: AC (50 mV–75 V peak), DC (5 V, 12 V, 24 V)

• Input Frequency: Up to 50 kHz (AC and DC)

• Counter Speed: 0–50 kHz

• Maximum Count Value: ±32K or ±8M depending on mode

• Channel Update Time: 4 ms per channel

• Input Impedance: 25 kΩ

• Logic Levels: VIL ≤ 1.0 V, VIH ≥ 3.5 V, Vmax 75 V

• Backplane Current Draw: 225 mA @ 5 VDC

• Power Dissipation: 1.75 W max

• Filters: Digital filter (50 kHz default, 30 kHz option), Analog filter (15 kHz)

• Accuracy:

• Count mode: ±1 count

• Instantaneous rate: ±1% @ 50 kHz, ±0.001% @ 1 Hz

• Average rate: ±1 Hz

• Data Format:

• Counter mode: -8,388,608 to +8,388,607

• Rate mode: -32,768 to +32,767

• Fault Detection: Over-range and under-range status bits for all modes

• Slot Width: Single slot

• Weight: 0.38 lbs (0.17 kg)

Application Scenarios

• Flow measurement in industrial processes

• High-speed counting applications in automation systems

• Quadrature encoder feedback for motion control

• Machine-level monitoring requiring precise rate and count accuracy

FAQ

Q: How many counter inputs does the 1746sc-CTR4 provide?  A: Four differential counter inputs.

Q: Does it support quadrature encoding?  A: Yes, two channels of quadrature encoding are supported.

Q: What is the maximum input frequency?  A: Up to 50 kHz for both AC and DC signals.

Q: What controllers are compatible?  A: It is designed for the Allen-Bradley SLC 500 series.