Configured for controller execution and I/O management within a ControlLogix system, the Allen-Bradley 1756-L73K (1756-L73K Processor Module) provides processor resources for application logic, I/O data handling, and controller communication.

Model Identification

The 1756-L73K is identified as a ControlLogix processor module. The supplied documentation specifies 8 MB of user memory and 0.98 MB of I/O memory. No additional suffix decoding is established from the supplied data.

Hardware Specifications

ControlLogix Processor Characteristics

The processor operates from the ControlLogix backplane and draws 800 mA at 5.1 VDC, with an additional 5 mA current draw at 1.2 VDC. The specified maximum I/O capacity is 128,000 points, including up to 4,000 analog I/O points.

The supplied data lists 2.5 W power dissipation and 8.5 BTU/hour thermal dissipation. These values should be considered when calculating ControlLogix chassis thermal loading.

The 30 V continuous isolation voltage defines the supplied electrical isolation specification. The available information does not specify channel-level isolation, network isolation, or individual I/O circuit isolation.

Ordering Information

• 1 x Allen-Bradley 1756-L73K ControlLogix Processor Module
• 1 x Processor module hardware corresponding to the specified catalog number
• No separate communication adapter or programming cable is specified as part of the supplied product data

Installation and Handling

• Install the processor in a compatible ControlLogix chassis using the manufacturer's specified module position and retention method.
• Verify chassis backplane power capacity against the 800 mA current draw at 5.1 VDC.
• Account for the stated 2.5 W power dissipation when evaluating enclosure thermal conditions.
• Keep processor and communication wiring separated from high-energy conductors where practical.
• Protect the module from electrostatic discharge during handling and installation.
• Confirm the required firmware and controller configuration before placing the processor into service.
• Do not infer operating-temperature limits from the supplied data because no specific temperature rating was provided.

Frequently Asked Questions

• What is the user memory capacity of the 1756-L73K?

  The supplied specification lists 8 MB of user memory for controller application data and program storage.

• How much I/O memory is specified?

  The processor is specified with 0.98 MB of I/O memory for controller I/O data handling.

• What is the maximum digital I/O capacity?

  The supplied data specifies a maximum of 128,000 digital I/O points.

• What is the maximum analog I/O capacity?

  The specified maximum analog I/O capacity is 4,000 points. The supplied data does not define a specific analog module mix.

• What is the 5.1 VDC backplane current draw?

  The processor draws 800 mA at 5.1 VDC according to the supplied technical specification.

• What is the processor power dissipation?

  The specified power dissipation is 2.5 W. The corresponding thermal dissipation is listed as 8.5 BTU/hour.

• What isolation voltage is specified?

  The supplied specification lists 30 V continuous isolation voltage. It does not identify this as channel-to-channel isolation.

• Is an operating temperature range provided?

  No operating temperature range is included in the supplied technical data. A specific environmental rating should therefore not be inferred.