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1775-LP8

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Allen-Bradley 1775-LP8 is a PLC-3/10 controller used with documented remote I/O and operator-interface paths, with published scan-time baselines for project planning.
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Technical specifications for 1775-LP8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1775-LP8
  • Product Family:
    PLC-3
  • Product Type:
    PLC-3/10 Processor
  • Stock:
    1
  • Product Family:
    PLC-3/10
  • Product Role:
    Programmable controller
  • Remote I/O Context:
    1771-ASB adapter path
  • Typical Program Scan:
    2.5 ms per K
  • Typical Discrete I/O Scan:
    6 ms per chassis on the same channel
  • 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 Remote I/O Path Operator Devices Response Planning Product Applications

Features:

  • PLC-3/10 controller context
  • Remote I/O through 1771-ASB
  • Operator-interface timing dependencies
Allen-Bradley 1775-LP8 is documented in PLC-3/10 remote-I/O and operator-interface applications.

The controller reaches a supported 1771 remote rack through its adapter path rather than by treating the rack as local processor hardware.

Program scanning, I/O scanning, terminal service, and block transfers all contribute to the response observed by an operator.

Apter Power can coordinate 1775-LP8 label review, official documentation, quotation details, and remote-I/O record checks.
1775-LP8 PLC-3/10 Processor 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.
  • The documented PLC-3/10 route to a supported 1771 remote rack uses a 1771-ASB adapter.
  • Rack addressing, adapter configuration, and the controller project must describe the same I/O path.
  • Each installed 1771 module still requires the wiring and compatibility information for its own catalog.
  • Rockwell documentation includes the controller in remote-I/O message-display applications.
  • Bulletin 2705 keypad equipment uses the configured remote-I/O scanner and rack relationship.
  • A device that is listed for the controller can still fail to communicate when its rack address or cable path is wrong.
  • The published program-scan baseline is approximately 2.5 ms per K of program.
  • A same-channel discrete I/O chassis adds an approximate 6 ms scanning component.
  • Terminal work and block transfers must be added before the estimate is compared with measured machine response.
  • Controls PLC-3/10 projects that use documented 1771-ASB remote-I/O paths.
  • Exchanges messages with listed remote-I/O operator-display equipment.
  • Supports Bulletin 2705 keypad interaction in the documented controller context.
Description
Rockwell Automation documentation places 1775-LP8 in the PLC-3/10 controller group used with remote I/O and operator-interface equipment. Its published context is the PLC-3/10 system, not the earlier modular PLC-3 main-processor arrangement.

In a remote installation, 1775-LP8 reaches supported 1771 I/O through the documented 1771-ASB adapter path. Message displays and keypad devices add their own processing and communication load, so the operator’s response time is shaped by more than the controller program scan.

Planning a change to 1775-LP8 is easiest when the project archive, remote rack map, adapter catalog, terminal configuration, and complete controller label are available together. Memory capacity or direct replacement should remain unapproved unless exact-model manufacturer evidence supports the claim.
Alternative Names
Allen-Bradley 1775 LP8 PLC-3/10 Processor Rockwell 1775LP8 Controller PLC-3/10 LP8 Processor
Technical notes
Published scan figures for 1775-LP8 are planning baselines, not guaranteed cycle times. Allow for the program scan, each same-channel I/O chassis, block transfers, and operator-terminal processing, then measure the completed machine response; a timing estimate that omits any of those paths can misidentify a normal configuration delay as a controller fault.
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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 I reconnect an existing 1771 rack to 1775-LP8 without reviewing the adapter?
No. Start with the 1771-ASB catalog, rack address, chassis, and controller project. An existing cable does not prove that the adapter path still matches the restored configuration.
Why can a DL40 display update more slowly after a change to 1775-LP8?
The total delay includes the program scan, remote-I/O scan, terminal processing, and any block transfers. Compare the current rack map and message workload with the previous project before blaming the controller.
How do I estimate response time when 1775-LP8 serves several I/O chassis?
Begin with the typical program-scan figure, add the documented same-channel chassis contribution, and include terminal and block-transfer time. Use a measurement at the machine to validate the result.
What should I inspect when a Bulletin 2705 keypad stops communicating with 1775-LP8?
Check the scanner route, rack address, keypad configuration, and cable path against the saved project. Correct the first mismatch found before changing controller hardware.
Which records are most useful before replacing 1775-LP8?
Save the complete application, remote rack map, adapter catalog, operator-device settings, and full label with revision. Together they provide a workable restoration reference for the outage.
Does the LP8 suffix establish the memory capacity of 1775-LP8?
No. The suffix alone is not manufacturer evidence of memory capacity. Use the complete unit label and exact Rockwell documentation; leave the capacity unapproved when that evidence is unavailable.