Allen-Bradley 1769-L31 CompactLogix Processor 512 KB

Allen-Bradley 1769-L31 CompactLogix L31 controller, 512 KB user memory, two RS-232 ports, 13 Compact I/O modules. NJT Automation sources the 1769-L31 on request; send the part number for a replacement or repair quote.

Quote required. Request a quote below for pricing and delivery.

Allen-Bradley 1769-L31 CompactLogix controller, 512 KB

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Part Number	1769-L31
Price	On Request Availability and condition determine final quote.
Description	CompactLogix controller, 512 KB.
Shipping	UPS Ground included \| Next-Day Air and Worldwide Shipping available at checkout
Warranty	1-year full-function warranty provided by NJT Automation. Warranty details Included 1 year, full-function 2 years +15% of product price 3 years +25% of product price View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1769-L31 after your purchase for a 10% core credit. We also purchase old or damaged parts outright.

Availability

Sourced on request

We do not have a 1769-L31 on the shelf right now. We can source one through our supplier network; request a quote and we confirm availability, price and lead time before you commit.

Sourcing

Sourced through our Level 1 network of vetted US suppliers. Each unit is checked before it ships and carries the same NJT warranty and return policy as our own stock. Quotes within one hour during business hours; typical delivery 3–5 business days, next-day air available. Sourced parts are not available for local pickup.

Request Quote How Level 1 sourcing works

Repairs

1769-L31 Mail-In Repair Service

Part Number Decoder

CompactLogix controller

1769L31serial

1769: BulletinCompactLogix / Compact I/O: Rockwell Automation's rack-less, DIN-rail Logix platform. 1769 controllers, I/O modules, power supplies and adapters snap together on a shared backplane bus.
L31: ControllerCompactLogix L31 controller (first-generation CompactLogix, CompactFlash memory card).
512 KB: Memory size512 KB of user memory.
serial: CommunicationTwo RS-232 ports; 13 Compact I/O modules.

Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here.

Intended Use

Designed for machine-level control applications. CompactLogix controllers run packaging machines, palletizers, conveyors, material handling, small process skids and OEM equipment where a mid-size Logix controller with local I/O fits in the machine panel and programs in Studio 5000 like the rest of the plant.

Migration Path

Rockwell Automation has discontinued the first-generation 1769-L2x and L3x CompactLogix controllers. Published successor for the CompactLogix L2x / L3x: 1769-L30ER (CompactLogix 5370).

The 1769 Compact I/O and 1769-PA/PB power supplies carry over unchanged to a CompactLogix 5370 L3; the controller sits in the same left-most position on the same bus.
Open the project in Studio 5000 (RSLogix 5000 v20 also supports the L3xER), change the controller type, verify and download. The L3xER has dual EtherNet/IP ports with Device Level Ring, an SD card (1784-SD1) in place of CompactFlash and no RS-232 port, so serial devices move to Ethernet.
To move to Compact 5000 (5069) I/O instead, choose a CompactLogix 5380 and plan a re-termination; 1769 I/O does not mount on the 5380.

A like-for-like replacement or a repair keeps the existing program, wiring and panel layout; a migration is a project. Both are listed on this page so the choice can be made on lead time and budget.

Physical Data

Weight and DimensionsWeight0.75 lb (0.34 kg)H × W × D5.2 × 2.2 × 4.8 in. (131.1 × 56.4 × 121.1 mm)

Weight	0.34 kg (0.75 lb) Typical unit weight
Dimensions (H × W × D)	131.1 × 56.4 × 121.1 mm (5.2 × 2.2 × 4.8 in.) Single-slot controller
Shipping Weight	1.06 kg (2.34 lb) Estimated: unit weight plus box and packing material; bills as 3 lb
Shipping Box (L × W × H)	14 × 12 × 10 in. (356 × 305 × 254 mm) Smallest standard box fitting the product with 3 in. cushioning per side

Product weight and dimensions are typical manufacturer-published values and may differ by series or option. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box.

Allen Bradley Information

Technical SpecificationsLifecycle status

Lifecycle	Discontinued Verify current status with the manufacturer.

Can the 1769-L31 be repaired?

Yes. NJT Automation repairs the 1769-L31 by mail-in: diagnostic evaluation, component-level repair and a functional test, backed by a 1-year full-function warranty.

NJT managed repair. No evaluation fee; no repair, no charge. Prepaid UPS label both ways, $650 minimum, rush available. 1-year full-function warranty included, 2- and 3-year options.

Get a repair quoteor text photos and symptoms to (414) 331-5954

Compare quotes from independent repair technicians. Post your repair on RepairMode to receive competitive bids from experienced technicians. Each technician sets their own pricing and warranty.

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Common failures

Failure patterns we regularly see on CompactLogix controller hardware like the 1769-L31:

Program lost on power cycle: battery (1769-BA) depleted, BAT LED red or flashing
1769 bus faults from a worn local-bus connector or a missing end cap
Channel 0 RS-232 port damaged by a hot-plugged programming cable
CompactFlash or SD card corruption: stored project will not load
Embedded Ethernet port failure or dropped connections on -E / -ER controllers

Related services:PLC Repair All Repair Services

Photos by NJT Automation; test videos from NJT or network repair technicians.

Still have questions?

Find answers to shipping, warranties, repairs, and more.

Frequently Asked Questions

What is the 1769-L31?

The Allen-Bradley 1769-L31 is a CompactLogix L31 controller, 512 KB user memory, two RS-232 ports, 13 Compact I/O modules.

What condition is it in?

The 1769-L31 may be available on request in Unused surplus / Refurbished / Used condition. We can quote this part in unused surplus, refurbished, or used condition depending on availability and your preference. Specify your requirement in the RFQ.

When does this part ship?

The 1769-L31 is sourced on request. Request a quote and we'll confirm availability and lead time, typically a few business days.

What communication ports does it have?

Two RS-232 ports; 13 Compact I/O modules.

How much memory does it have?

512 KB of user memory.