Allen Bradley 1756-CFM ControlLogix Configurable Flowmeter Module

Product Description

The Allen‑Bradley 1756‑CFM is a high-performance ControlLogix configurable flowmeter module designed for versatile industrial automation applications. It provides two fully configurable channels that can function as inputs or outputs, supporting both high-speed frequency measurement and pulse counting. Moreover, its flexible design allows integration with RPM measurement, totalizing, and flow monitoring systems. The module supports RIUP (Removal and Insertion Under Power), ensuring minimal system downtime during maintenance or upgrades. In addition, reinforced insulation and channel-to-channel isolation guarantee reliable operation in demanding industrial environments.

This module requires an Allen‑Bradley Logix 5550 series owner-controller to operate properly and can connect directly or in listen-only mode for system monitoring. Its open enclosure design and removable terminal blocks provide convenient installation and wiring options. For industrial engineers seeking accurate flow measurement combined with robust system integration, the 1756‑CFM module delivers both precision and operational flexibility.

Key Features

Two independent channels configurable as input or output for versatile usage
Supports high-speed frequency, pulse counting, and totalizer applications
Channel-to-channel isolation and reinforced insulation ensure safety and reliability
RIUP capable for minimal downtime during maintenance
Compatible with Allen‑Bradley Logix 5550 series controllers
Removable terminal blocks for simplified installation and wiring
Open chassis design suitable for DIN rail mounting in ControlLogix systems
High-speed flow monitoring and RPM measurement capability

Technical Specifications

Model: 1756-CFM
Manufacturer: Allen‑Bradley / Rockwell Automation
Series: ControlLogix I/O Modules
Channels: 2 independent channels, configurable as input or output
Inputs:
- 2 flowmeter inputs (all modes)
- 2 gate inputs for totalizer mode
Outputs: 2 current-sourcing outputs
Voltage Range: 5–24 V DC
Isolation:
- Channel-to-channel
- I/O to backplane reinforced insulation: 250 V continuous
- I/O group-to-group basic insulation: 250 V continuous
Backplane Current:
- 5V DC: 10 A
- 24V DC: 2.8 A
Power Dissipation: Maximum 6 W at 60°C
Operation Mode: Totalizer, Fill, and Prover
Removable Terminal Blocks: 1756-TBNH, 1756-TBSH
Mounting: Open chassis on DIN rail via ControlLogix chassis
Weight: 0.43 kg
Certifications: IEC tested, insulation type tested at 10 V rms with 1 kHz sine

Typical Applications

Flow monitoring in chemical, water treatment, and process industries
RPM and speed measurement for motor or conveyor control
Totalizing and counting applications in batch processing systems
Frequency-based control for pumps, fans, and flow-controlled valves
High-speed pulse monitoring for advanced industrial automation

Support & Maintenance

Allen‑Bradley provides full repair, calibration, and technical support services for the 1756‑CFM module. Moreover, its industrial-grade design ensures long-term reliability in demanding process environments. Proper installation and periodic inspection maximize module lifetime and maintain accurate flow measurement performance.

FAQ

Q1: What controllers are compatible with the 1756‑CFM module?
A1: The 1756‑CFM requires a Logix 5550 series owner-controller to operate correctly.

Q2: Can I use both channels as outputs simultaneously?
A2: Yes, both channels can be configured independently as inputs or outputs.

Q3: Is the module safe for high-voltage environments?
A3: Yes, the module includes reinforced insulation and channel-to-channel isolation rated at 250 V continuous.

Q4: Can the module be removed while powered?
A4: Yes, the module supports RIUP (Removal and Insertion Under Power) for maintenance.

Q5: What type of signals does the module support?
A5: The module supports high-speed pulse, frequency measurement, flowmeter inputs, and gate inputs for totalizing.