Allen Bradley 1756-CFM ControlLogix Configurable Flowmeter Module

Overview

The Allen‑Bradley 1756‑CFM is a high-performance ControlLogix configurable flowmeter module engineered for precise industrial process monitoring. It supports flow measurement, pulse counting, and RPM monitoring with exceptional accuracy. Moreover, its flexible configuration allows seamless integration into ControlLogix automation systems, making it suitable for diverse manufacturing and process applications. The module’s compact and robust design ensures reliable operation under demanding industrial conditions.

Key Features & Functional Highlights

• Configurable Channels: Two flowmeter inputs and two gate inputs allow flexible use in various applications.

• High-Speed Measurement: Supports fast pulse and frequency inputs for accurate flow and RPM monitoring.

• Versatile Operation Modes: Functions include frequency measurement, pulse counting, RPM monitoring, totalizing, and fill/prover applications.

• Industrial Reliability: Reinforced insulation, compliance with global standards, and open-enclosure design ensure safe and stable operation.

• Hot-Swappable: Supports RIUP (Removal and Insertion Under Power) for minimal downtime.

Technical Specifications

• Model: 1756‑CFM

• Type: ControlLogix Configurable Flowmeter Module

• Manufacturer: Allen‑Bradley / Rockwell Automation (USA)

• Channels: 2 flowmeter inputs, 2 gate inputs

• Electrical Ratings:

• 250 V continuous reinforced insulation (I/O to backplane)

• 250 V continuous basic insulation (I/O group to group)

• 10 V rms, 1 kHz sine isolation test

• Backplane Current: 5 V DC: 10 A, 24 V DC: 2.8 A

• Max Power Dissipation: 6 W at 60°C

• Operating Temperature: 0–60°C

• Connection Type: Screw terminal blocks (compatible with 1756-TBNH, 1756-TBSH)

• Weight: 0.88 lbs

• Dimensions: 11.12 × 14.3 × 2.17 inches

Typical Applications

• Flow measurement in pipelines and process industries

• RPM monitoring for pumps, motors, and rotating machinery

• Pulse counting on production lines or batching systems

• Totalizing for metering, filling, and verification processes

FAQ

Q1: Can the 1756-CFM module operate without a ControlLogix 5550 series controller?
A1: No, the module must be connected to a Logix 5550 series owner-controller to function properly.

Q2: What types of input signals does it support?
A2: It supports high-speed frequency, pulse inputs, and gate inputs for totalizer and prover applications.

Q3: Is the module hot-swappable?
A3: Yes, the 1756-CFM supports Removal and Insertion Under Power (RIUP), reducing downtime during maintenance.

Q4: What is the maximum frequency resolution of the module?
A4: It supports up to 100 kHz resolution with a minimum frequency of 0.0005 Hz.

Q5: Can the module handle high temperatures?
A5: It operates reliably in temperatures ranging from 0 to 60°C.