AB 1756-L61S
AB 1756-L61S
AB 1756-L61S
AB 1756-L61S
AB 1756-L61S
AB 1756-L61S
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  • Lifecycle status

    Discontinued
    Discontinued date: 2017-06-01
    Replacement category: Functional Replacement
    Engineering replacement: 1756-L71S

1756-L61S

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Allen-Bradley 1756-L61S is a GuardLogix safety controller with 2 MB standard memory, 1 MB safety memory and one RS-232 port.
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Technical specifications for 1756-L61S

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L61S
  • Product Family:
    ControlLogix
  • Product Type:
    GuardLogix Safety Controller, 2 MB Standard Memory / 1 MB Safety Memory
  • Stock:
    1
  • Standard memory:
    2 MB
  • Safety memory:
    1 MB
  • Embedded communication port:
    None
  • Local communication:
    One RS-232 port
  • CompactFlash card option:
    1784-CF64 or 1784-CF128
  • Functional replacement:
    1756-L71S
  • Safety architecture:
    Primary controller and safety partner operating in a 1oo2 architecture
  • Functional safety capability:
    Integrated safety for applications up to SIL 3 and Performance Level e
  • Operating temperature:
    0–60 °C for non-XT equipment
  • Weight:
    0.32 kg
  • 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 Safety Migration Communications Project Retention Application
  • Discontinued GuardLogix controller with 2 MB standard and 1 MB safety memory
  • One local RS-232 port and no embedded communication port
  • 1756-L71S is the manufacturer-listed functional replacement

1756-L61S is a GuardLogix safety controller for legacy ControlLogix safety systems.

Its replacement is a controlled safety-system activity because the controller, safety project, communication architecture and validation record are interdependent.

Verify the approved migration plan before using the functional replacement.

Availability, condition, price, and shipping time for 1756-L61S are confirmed during quotation.

Allen-Bradley 1756-L61S GuardLogix Controller Manuals, Product Family, 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.

  • Use the listed 1756-L71S functional replacement only with an approved migration plan
  • Preserve the validated safety application and safety partner arrangement
  • Revalidate the complete safety function after controlled migration
  • Account for the absence of an embedded communication port
  • Identify the installed RS-232 and external network architecture
  • Do not assume a replacement retains the original network path
  • Record firmware and safety-project revision before controller removal
  • Identify any 1784-CF64 or 1784-CF128 card and its handling procedure
  • Maintain independent verified application backups
  • SIL 3 and Performance Level e machine-safety control using a matched 1756-LSP safety partner
  • GuardLogix emergency-stop and protective-device safety functions
  • Distributed CIP Safety systems using compatible remote safety I/O over supported networks
Description
1756-L61S is an Allen-Bradley GuardLogix controller with 2 MB standard memory and 1 MB safety memory. Rockwell documents the GuardLogix architecture as a primary controller and safety partner operating together in a 1oo2 architecture.

The controller is intended for functional-safety applications up to SIL 3 and Performance Level e. It has no embedded network port, provides one RS-232 local programming port, and supports CompactFlash nonvolatile memory.

Before replacement or firmware work, verify the complete 1756-L61S nameplate, installed Series marking, safety partner, project archive, firmware compatibility, communication modules and safety validation record.
Revisions

Revision Part #

Also known as

1756-L61S Ser B
1756-L61S/B, Series B, Rev B
Alternative Names
1756-L61S 1756 L61S Allen-Bradley 1756-L61S Allen-Bradley 1756 L61S ControlLogix 1756-L61S
Technical notes
1756-L61S is discontinued with 1756-L71S listed as functional replacement; migrate the validated safety application, firmware, network architecture and safety hardware as a controlled system.
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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.
What should be reviewed before replacing Allen-Bradley 1756-L61S with a newer safety controller?
Rockwell lists 1756-L71S as a functional replacement, but safety behavior, firmware, partner compatibility, chassis modules, network architecture, and validation records require review.
How should Allen-Bradley 1756-L61S be connected to an existing plant network?
Treat communications as an external design item: verify chassis communication modules, network protocol, addresses, produced or consumed tags, and safety-related data paths before commissioning.
What safety-project checks are required before deploying Allen-Bradley 1756-L61S?
Confirm the safety signature, task configuration, partner relationship, fault response, I/O mapping, change history, and documented validation tests match the approved safety application.
Can Allen-Bradley 1756-L61S be replaced by 1756-L71S without validating the safety system?
No. The L71S designation is a functional replacement, not proof that the existing safety project, firmware, partner arrangement, and validation documentation can be used unchanged.
Why is a CompactFlash card check relevant to Allen-Bradley 1756-L61S service?
The manufacturer page lists 1784-CF64 and 1784-CF128 card options. Identify the installed card and its project-handling procedure before controller removal.
What should be backed up before replacing Allen-Bradley 1756-L61S?
Back up the standard and safety applications, controller configuration, safety-partner information, firmware record, chassis inventory, and network design.
Can a powered Allen-Bradley 1756-L61S be considered a validated safety controller?
No. Safety validation requires the approved safety application, correct system hardware, and documented functional test process; power status alone is not validation.