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1775-L4

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Allen-Bradley 1775-L4 is the PLC-3/10 processor with multiple execution contexts, timed interrupts, programmable fault response, and onboard PASS/FAIL diagnostics.
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Technical specifications for 1775-L4

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1775-L4
  • Product Family:
    PLC-3
  • Product Type:
    PLC-3/10 Processor Module
  • Stock:
    1
  • Module Width:
    Single slot
  • Programming Instructions:
    More than 70
  • Data Table:
    Flexible, limited by available memory
  • Program Features:
    Timed interrupt and programmable fault response
  • Numeric Operations:
    Integer, floating-point, and double-precision integer math
  • Program Organization:
    Multiple contexts
  • Time Functions:
    Real-time clock and calendar
  • Diagnostics:
    Onboard PASS and FAIL indicators
  • Dimensions:
    6.6 × 33 × 47.6 cm
  • Processor Architecture:
    Four AMD 2903 bit-slice microprocessors
  • Current Requirement at 5 V DC:
    6 A
  • Current Requirement at 15 V DC:
    40 mA
  • Operating Temperature:
    0 to 60 °C
  • Storage Temperature:
    -40 to 85 °C
  • Relative Humidity:
    5% to 95%, noncondensing
  • Weight:
    2.78 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 Processor Functions Diagnostics Chassis Fit Application
  • Install only in the PLC-3/10 processor position, not in the larger PLC-3 processor chassis
  • Restore the verified application before checking timed interrupts and multiple execution contexts
  • Use PASS and FAIL indicators for initial diagnostics, then complete controlled machine testing

1775-L4 is the processor position for a PLC-3/10 controller and is not specified for the larger PLC-3 main processor chassis.

Its instruction execution, timed interrupts, multiple contexts, and fault response depend on the complete application restored to the module.

PASS and FAIL indications provide the first hardware check, but controlled machine testing is still required before production release.

Availability, condition, price, and shipping time for 1775-L4 are confirmed during quotation.

Allen-Bradley 1775-L4 PLC-3/10 Processor Module 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 single-slot processor manages PLC-3/10 program execution and memory.
  • More than 70 instructions include program control, math, timer, counter, and logical functions.
  • Multiple contexts and timed interrupts support structured execution of the retained application.
  • Onboard PASS and FAIL indicators continuously report processor self-check status.
  • Programmable fault response can execute a defined routine before a processor fault.
  • Commissioning must prove the restored application and every safety-related machine response.
  • 1775-L4 is intended for the PLC-3/10 controller platform.
  • The official product data prohibits installation in PLC-3 main processor chassis 1775-A1 or 1775-A2.
  • System power must be removed before inserting or removing the module.
  • PLC-3/10 machine control requiring the documented processor instruction set.
  • Applications using multiple contexts, timed interrupts, or programmable fault routines.
  • Like-for-like PLC-3/10 processor replacement with a preserved application.
Description
Allen-Bradley 1775-L4 is the single-slot processor that manages program execution and memory functions in a PLC-3/10 controller.

It provides more than 70 instructions, configurable data-table use, high-speed scan, timed interrupts, programmable fault response, multiple contexts, real-time clock and calendar, and onboard diagnostics.

The module belongs in the PLC-3/10 chassis and is not compatible with the PLC-3 main processor chassis, so chassis identity must be confirmed before replacement.
Alternative Names
1775-L4 Allen-Bradley 1775-L4 Allen Bradley 1775-L4 PLC-3/10 1775-L4 1775-L4 PLC-3/10 Processor Module Allen-Bradley PLC-3/10 1775-L4
Technical notes
1775-L4 replacement requires a PLC-3/10 chassis, preserved contexts, data-table allocation, timed and fault routines, and verified memory; installation in a PLC-3 main processor chassis is prohibited.
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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.
How can a buyer confirm Allen-Bradley 1775-L4 fits the installed controller?
Verify that the chassis is a PLC-3/10 chassis, not a PLC-3 main processor chassis, and match the complete processor catalog and application.
Can Allen-Bradley 1775-L4 be installed in a PLC-3 main processor chassis?
No. Rockwell explicitly states that 1775-L4 is not compatible with the PLC-3 main processor chassis catalogs 1775-A1 or 1775-A2.
What should be backed up before replacing Allen-Bradley 1775-L4?
Preserve every program context, data-table allocation, timed-interrupt routine, fault routine, clock-dependent function, I/O reference, and machine commissioning record.
Must power be removed before handling Allen-Bradley 1775-L4?
Yes. The official document warns to remove system power before inserting or removing the processor module.
Why might a replacement Allen-Bradley 1775-L4 enter a fault condition?
A mismatched application, chassis, memory organization, I/O context, timed routine, or restored configuration can cause diagnostic or program faults.
What should be tested after installing Allen-Bradley 1775-L4?
Check PASS and FAIL indications, restore the verified application, validate each context and I/O path, and prove timed and fault routines under controlled conditions.
Why should Allen-Bradley 1775-L4 be tested with the original PLC-3/10 application rather than only as a standalone module?
Its practical behavior depends on the restored program contexts, timed interrupts, I/O references, and programmed fault response, which a standalone power-up cannot validate.