AB 1756-L72S
AB 1756-L72S
AB 1756-L72S
AB 1756-L72S
AB 1756-L72S
AB 1756-L72S
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    Active Mature
    Rockwell Automation identifies 1756-L72S as fully supported while newer products or families may exist.

1756-L72S

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Allen-Bradley 1756-L72S is a 4 MB/2 MB GuardLogix 5570 controller that requires a matched 1756-L7SP safety partner.
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Technical specifications for 1756-L72S

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-L72S
  • Product Family:
    ControlLogix
  • Product Type:
    Logix 5572S Automation Controller 4M/2M
  • Stock:
    1
  • Standard/safety memory:
    4 MB / 2 MB
  • Local programming:
    1 USB
  • Storage:
    SD
  • Energy storage:
    1756-ESMCAP
  • Power dissipation:
    2.5 W
  • Listed firmware:
    GuardLogix 5570 v38.011
  • Controller family:
    GuardLogix 5570 Safety Controller
  • Standard memory:
    4 MB
  • Safety memory:
    2 MB
  • Nonvolatile memory:
    1784-SD1 1 GB or 1784-SD2 2 GB Secure Digital card
  • Operating temperature:
    0 to +60 °C
  • Storage temperature:
    -40 to +85 °C
  • Weight:
    0.25 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 4M/2M Identity Controller Service Safety Verification Application
  • 4 MB user memory and 2 MB safety memory for larger GuardLogix 5570 projects
  • Requires a 1756-L7SP immediately to the right with matching major and minor firmware
  • Uses SD nonvolatile storage and the installed 1756-ESMCAP energy-storage module

1756-L72S is the 4 MB/2 MB GuardLogix 5570 controller for safety applications requiring more memory than the 1756-L71S.

The primary controller and 1756-L7SP form one safety pair; partner position and exact firmware alignment are essential.

Before substitution, verify both memory allocations, the validated safety signature, SD image, safety I/O and energy-storage-module status.

Availability, condition, price, and shipping time for 1756-L72S are confirmed during quotation.

Allen-Bradley 1756-L72S GuardLogix 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.

  • Confirm both standard and safety project memory requirements
  • Do not substitute a 2M/1M controller from family similarity alone
  • Review the approved safety application after any memory-class change
  • Use the USB Type B service port for temporary programming and maintenance access
  • Verify the installed 1784-SD1 image before any load-on-power-up or restoration operation
  • Inspect the 1756-ESMCAP status and observe the documented shutdown procedure
  • Use a 1756-L7SP immediately to the right of 1756-L72S
  • Match the major and minor firmware revisions of both safety-pair modules
  • Repeat the required safety validation after controller or safety-project changes
  • GuardLogix applications requiring 4 MB standard memory and 2 MB safety memory
  • SIL 3 and Performance Level e machine-safety systems using a matched 1756-L7SP
  • Distributed CIP Safety architectures using supported ControlLogix communication modules
Description
1756-L72S is a GuardLogix 5570 safety controller with 4 MB user memory and 2 MB safety memory.

It operates with a 1756-L7SP safety partner installed immediately to the right; both modules must use matching major and minor firmware revisions.

The controller uses SD nonvolatile storage and a 1756-ESMCAP energy-storage module. Preserve the safety signature and validation record during replacement.
Revisions

Revision Part #

Also known as

1756-L72S Ser B
1756-L72S/B, Series B, Rev B
Alternative Names
1756-L72S 1756 L72S 1756L72S Allen-Bradley 1756-L72S Rockwell Automation 1756-L72S Logix 5572S 1756-L72S
Technical notes
1756-L72S provides 4 MB user memory and 2 MB safety memory and requires a 1756-L7SP immediately to its right; match both firmware revisions and preserve the safety signature, SD image and ESM status.
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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.
Can Allen-Bradley 1756-L72S replace 1756-L71S without changing the GuardLogix project?
Do not assume so. Confirm controller catalog selection, standard and safety memory, firmware, safety partner, safety signature and all validation requirements.
Can Allen-Bradley 1756-L72S execute standard control and safety logic in the same project?
Yes. The 1756-L72S primary controller executes both standard and safety functions, but the safety task, safety programs and safety tags remain protected components. Any exchange of information between the standard and safety portions must follow the approved GuardLogix data-mapping and validation process.
What happens if Allen-Bradley 1756-L72S loses communication with its safety partner?
A missing, unavailable or incompatible safety partner produces a nonrecoverable safety fault. Safety-task execution stops and affected safety outputs enter their configured safe state until a compatible partner is installed, its firmware matches the 1756-L72S and the fault is properly cleared.
Can the SD card automatically restore Allen-Bradley 1756-L72S after replacement?
Only after confirming the stored image, controller catalog, firmware, load settings, safety project and approved restoration procedure.
What does safety-locking protect in an Allen-Bradley 1756-L72S project?
Safety-locking prevents unauthorized changes to the safety task, safety programs, routines, tags and safety signature. The controller must be safety-unlocked before those components can be modified, after which the safety application must be verified again before release.
How does Allen-Bradley 1756-L72S exchange safety data with distributed Guard I/O?
The 1756-L72S communicates with distributed safety devices through CIP Safety and a compatible chassis communication module. The Safety Network Number, device identity, ownership and connection configuration must agree with the validated GuardLogix project before safety communication can be established.
What must be validated after replacing Allen-Bradley 1756-L72S?
Validate the safety signature, partner relationship, firmware match, safety I/O, CIP Safety connections, stop functions, fault response and complete guarded machine sequence.

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