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Allen Bradley ControlLogix 1756-CFM

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1756-CFM

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The 1756-CFM module is an Allen-Bradley/Rockwell Automation configurable flowmeter module from the ControlLogix series. It comes with gate inputs, flowmeter inputs, 2 configurable flowmetering channels, and 2 current-sourcing outputs. The 1756-CFM configurable flowmeter module supports RIUP or Removal and Insertion Under Power. It needs to be “owned” by an Allen-Bradley Logix 5550 series owner-controller device in order to function properly. The 1756-CFM configurable flowmeter module can make a direct connection or a listen-only type of connection to a Logix controller.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1756-CFM

ManufacturerAllen Bradley
CategoryPLCs
Product LineControlLogix
Part Number1756-CFM
UPC612598206698
Weight0.94 lbs (0.43 kg)
Inputs2 Flowmeter Inputs, 2 Gate Inputs
Operation ModeTotalizer Fill and Prover
Backplane Current (5Volts)300 milliamps
Backplane Current (24Volts)6 milliamps
Power Dissipation (Max)6 Watts at 60 Celsius
Removeable Terminal Blocks1756-TBNH, 1756-TBSH
EnclosureOpen
Backplane Current (5 Volts DC)10 amps
Backplane Current (24 Volts DC)2.8 Amps
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The 1756-CFM ControlLogix Configurable Flowmeter by Allen-Bradley is a module located on the ControlLogix Chassis, with a single-slot for interfacing between the LogixController and the external I/O devices. It has 4 inputs (2 flow-meter, and 2 gate inputs) with an IEC-certified current rating between 6 and 30mA at 24V DC and at a maximum input frequency of 100 KHz. It has a flow-meter input voltage ranging between +/- 30V DC with a selectable input threshold of 50mV, 1.3V, and 4V and an impedance of 5kΩ.

The 1756-CFM has two current sourcing (IEC 1A, 24V DC) outputs with output ratings of 4.5-5.5V DC for 3-20 mA load per point, and 10-31.2V DC for 40mA to 1A load per point. The output has a surge current of 2A for 50ms re-curing every 2s with an OFF state current leakage of <300µA at 31.2V. Its output switching time is 1ms and with an overload current of 4A it offers short-circuit protection. The 1756-CFM has a backplane current of 300mA at 5.1V DC and 6mA at 24V DC and it has a maximum power dissipation of 6W (20.4 BTU/hr). Its operational temperature ranges between 0 and 60°C (32 and 140°F) at 5-95% non-condensing relative humidity limit and it is built to withstand an operational shock of up to 30G.

Revision Part #Also known as
1756-CFM Ser A1756-CFM/A, Series A, Rev A
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