Configured for flow measurement signal processing in ControlLogix systems, the Allen-Bradley 1756-CFM (1756-CFM Configurable Flowmeter Module) provides direct physical/electrical execution for flowmeter input acquisition, gate input monitoring, and totalizer control functions.

Model Identification

The 1756-CFM is a ControlLogix configurable flowmeter module designed for integration into ControlLogix chassis systems. The module supports flowmeter input channels and gate input channels with selectable operating modes including Totalizer, Fill, and Prover functions.

Hardware Specifications

ControlLogix Communication and I/O Integration

The 1756-CFM operates as a ControlLogix chassis module and exchanges process data through the backplane bus. The module architecture supports I/O density scaling within ControlLogix platforms by providing dedicated hardware processing for flowmeter and gate input signals.

The ControlLogix backplane interface manages module data transfer and configuration parameters. System integration requires compatible firmware revision matching between the module and the controller platform.

Ordering Information

• 1 x Allen-Bradley 1756-CFM Configurable Flowmeter Module
• 1 x Factory-installed module housing
• Terminal blocks are installed separately when required:
  • 1 x 1756-TBNH removable terminal block
  • 1 x 1756-TBSH removable terminal block

Field Installation Guidelines

• Install the module in a compatible ControlLogix chassis slot according to the system hardware configuration.
• Use the specified removable terminal blocks for field wiring connections.
• Verify backplane power loading before installation in a multi-module chassis.
• Separate flowmeter signal wiring from high-voltage power conductors to reduce electrical interference.
• Confirm controller firmware and module revision compatibility before commissioning.
• Maintain proper grounding practices for shielded signal cables where applicable.

Frequently Asked Questions

• What type of signals does the 1756-CFM accept?

The module supports 2 flowmeter inputs and 2 gate inputs for flow measurement and control-related signal processing.

• Which ControlLogix platform does the 1756-CFM belong to?

The 1756-CFM is part of the Allen-Bradley ControlLogix series and installs directly into a ControlLogix chassis.

• What operating modes are available on this module?

The module supports Totalizer, Fill, and Prover operating modes for configurable flow measurement applications.

• What is the maximum power dissipation of the module?

The supplied specification lists a maximum power dissipation of 6 W at 60 deg C operating conditions.

• Which terminal blocks are compatible with this module?

The 1756-CFM supports removable terminal blocks including 1756-TBNH and 1756-TBSH models.

• Does the module require a specific chassis slot?

The module is installed in a ControlLogix chassis and requires a compatible available slot configured within the system design.

• What is the backplane current consumption?

The module requires 300 mA from the 5 VDC backplane supply and 6 mA from the 24 VDC backplane supply.

• Can the module communicate through Ethernet/IP directly?

The module communicates through the ControlLogix backplane. Network communication depends on the controller and installed communication modules.