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1756-L73

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Allen-Bradley 1756-L73 is an 8 MB ControlLogix 5570 controller with modular networking and a distinctive no-residual-energy ESM option.
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Technical specifications for 1756-L73

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L73
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 5570 Controller
  • Stock:
    1
  • Product Series:
    ControlLogix 5570
  • User Memory:
    8 MB
  • I/O Memory:
    0.98 MB
  • Embedded Network Port:
    None
  • Local Programming Port:
    1 x USB 2.0
  • Controller Connections:
    500
  • Energy Storage Module:
    1756-ESMCAP supplied installed
  • Maximum Digital I/O:
    128,000 points
  • Maximum Analog I/O:
    4,000 points
  • Power Dissipation:
    2.5 W
  • Operating Temperature:
    0 to 60 °C
  • Weight:
    0.25 kg
  • Estimated shipping dimensions:
    3.46x14.52x14.29cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Program Revision Network Modules Recovery Media Product Applications

Features:

  • Controller generation: ControlLogix 5570 execution with modular chassis communications
  • Project storage: a 1 GB 1784-SD1 card is supplied preinstalled
  • Task framework: 32 tasks support structured continuous, periodic, and event-driven execution
1756-L73 fits established ControlLogix 5570 systems that require an 8 MB controller and protocol-specific chassis modules.

1756-L73 keeps temporary USB service separate from operational networking, so the communication module inventory is part of the controller configuration.

1756-L73 replacement planning should preserve the hardware series, firmware, ESM behavior, SD image, network modules, and approved shutdown procedure.

Apter Power can review catalog identity, ESM requirements, official records, and quotation details for 1756-L73.
Allen-Bradley 1756-L73 ControlLogix 5570 Controller Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Before version 15.01: the documented limit is 32 programs per task
  • From version 15.01: the allowance increases to 100 programs per task
  • Version 24 onward: up to 1,000 programs per task supports more modular application structure
  • Embedded path: no operational network port is built into the controller
  • Protocol choice: EtherNet/IP, ControlNet, DeviceNet, and legacy roles depend on selected modules
  • Connection budget: module limits, controller connections, and update demand must be assessed together
  • Supplied card: the controller is listed with a 1 GB 1784-SD1
  • Image identity: firmware, project revision, and load mode should form one controlled restore set
  • Replacement proof: the SD record should be matched to the controller series before commissioning
  • Installed-base control: ControlLogix 5570 machines and process systems using modular communications
  • Multi-protocol chassis: architectures that add the communication module required for each plant network
  • Integrated motion: coordinated-motion systems using qualified network, drive, and interface hardware
Description
In established modular ControlLogix systems, Allen-Bradley 1756-L73 provides an 8 MB 5570 controller with a separate 0.98 MB I/O-memory allocation, one USB programming port, and one-slot chassis installation. Operational network access comes from the appropriate communication module rather than an embedded plant-network port.

Program organization on 1756-L73 depends on the engineering software generation. Rockwell Automation documents increasing program-per-task allowances across older releases, while the controller retains 32 tasks, 500 controller connections, modular protocol choices, and integrated-motion support within the complete chassis design.

Energy-storage selection gives 1756-L73 a model-specific maintenance role. Its retention and transport behavior can be adapted through supported ESM choices, so the installed module, shutdown sequence, clock requirements, and recovery evidence should be treated as part of the controller configuration.
Revisions

Revision Part #

Also known as

1756-L73 Series A
1756-L73/A, Series A
1756-L73 Series B
1756-L73/B, Series B
Alternative Names
Allen-Bradley ControlLogix 5570 L73 Rockwell Automation 1756 L73 Processor ControlLogix 5570 8 MB Controller
Technical notes
For 1756-L73, 1756-ESMNSE is permitted because the controller sits at the 8 MB compatibility limit; larger 5570 models cannot use it. Select this module only where residual energy must fall to 40 µJ or less, and document the missing WallClockTime backup before approving transport or shutdown procedures.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can WallClockTime retention change after an ESM replacement on 1756-L73?
The installed ESM determines residual-energy and clock-backup behavior. Verify the exact ESM catalog, update the maintenance record, and test the required shutdown and restart sequence.
Why can 1756-L73 lose plant communication while USB programming still works?
USB is a separate temporary service path. Inspect the installed communication module, chassis status, module configuration, network cabling, and project ownership before blaming the controller CPU.
What must be matched before restoring 1756-L73 from a 1784-SD1 card?
Compare the controller series, firmware, stored controller type, project revision, load mode, and network configuration with the approved recovery record before initiating the load.
Why can an older project show fewer programs per task after conversion to 1756-L73?
The documented allowance depends on the Logix Designer generation. Confirm the source and target releases, review conversion messages, and reorganize the application only after compiling the converted project.
What should maintenance record before removing the ESM from 1756-L73?
Capture controller and ESM identity, firmware, current status, shutdown authorization, and the recovery image; after power loss, wait until the OK indicator changes through red to off.
How should a Series A spare be evaluated against an installed Series B 1756-L73?
Check official firmware and module compatibility, the exact ESM, chassis inventory, project revision, communication modules, and the site's qualification record before accepting the series change.