Allen-Bradley 1785-L11B PLC-5 – Ready to Ship / Pick Up

Name: Allen-Bradley 1785-L11B PLC-5
Brand: Allen-Bradley
SKU: 1785-L11B
Price: 549.99 USD
Availability: InStock

In stock: 1785-L11B PLC-5. NJT Automation has 1 unit available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.

Allen-Bradley 1785-L11B industrial automation module – front view

$549.99USD

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Part Number	1785-L11B
Description	Allen-Bradley 1785-L11B PLC-5. In stock in unused surplus condition, Series D.
Shipping	Ships today UPS Ground included \| Next-Day Air and Worldwide Shipping available at checkout
Pickup	Free local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954.
Warranty	1-year full-function warranty provided by NJT Automation. Warranty details Included 1 year, full-function 2 years +15% of product price ($82.50) 3 years +25% of product price ($137.50) View full warranty policy
Returns	90-day free returns. View return policy
Exchange	Send us your defective 1785-L11B after your purchase for a 10% core credit ($55). We also purchase old or damaged parts outright.

Replacement Options for 1785-L11B

In stock and ready to ship today

Allen-Bradley 1785-L11B/E Unused surplus (new old stock) - Buy 1785-L11B/E replacement | NJT Automation

Allen-Bradley 1785-L11B/E Unused surplus (new old stock) - alternate view

Allen-Bradley 1785-L11B/D PLC-5 Processor Ser. D 1785-L11B

$549.99 USD

Condition: Unused surplus (new old stock)

Series D

1 in stockView details

Variants

Part NumberConditionSeriesQtyPrice

1785-L11B/E /D$549.99

Unused surplus (new old stock) · Series D · 1 in stock

1785-L11B/E /DUnused surplus (new old stock)Series D1$549.99 USD

1785-L11B

Refurbished — pick series, then request a quote

Series neededRequest Quote

1785-L11BRefurbishedSeries needed—Request Quote

Availability

Similar Match Available

A similar unit is in stock and ready to ship once you confirm the condition you need.

Repairs

1785-L11B Mail-In Repair Service

Series & Revisions

Series D in stock; other series on request.

PLC-5 labels carry a series letter and a revision letter; later ones add firmware features under the same catalog number.

Series notes: Same slot and DH+ / Remote I/O wiring. Match or exceed the series/revision of the unit being replaced so the program loads.

Intended Use

Built for large-scale legacy process and discrete control applications. PLC-5 processors control the installed base of automotive, steel, pulp and paper, water treatment and chemical plants built from the late 1980s through the 2000s, with Remote I/O racks spread across the facility. Replacement processors keep those systems running without a rip-and-replace migration.

Migration Path

Rockwell Automation has discontinued the PLC-5 platform; new processors and communication modules are no longer manufactured. Published successor for the PLC-5: ControlLogix 5580 (1756-L8xE) or 5570 (1756-L7x) in a 1756 chassis.

Keep the existing 1771 Remote I/O racks running under the new controller with a 1756-RIO scanner, then convert racks one at a time instead of in a single outage.
Move 1771 I/O to 1756 I/O without rewiring field devices using the 1492 conversion wiring system (1492-CM1771 conversion modules with pre-wired cables).
Bridge DH+ with a 1756-DHRIO so existing PanelViews and PLC-5 peers stay on the network during the cutover.
Translate the RSLogix 5 program with the Studio 5000 Logix Designer project translation tool; publication 1756-RM085 lists the PLC-5 instructions and addressing that need manual rework.

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 DimensionsBox15 × 14 × 14 in.

Shipping Box (L × W × H)	15 × 14 × 14 in. (381 × 356 × 356 mm) Most common box recorded for this catalog number

Shipping box and weight are recorded from previous shipments of this catalog number and are provided for freight planning.

Allen Bradley Information

Allen Bradley PLC-5 Processor 1785-L11B.

Technical SpecificationsLifecycle status

Lifecycle	Discontinued Verify current status with the manufacturer.

Alternate Part Numbers

1785L11B

Can the 1785-L11B be repaired?

Yes. NJT Automation repairs the 1785-L11B 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

Prefer an independent shop? Compare bids on RepairMode; providers set their own pricing and warranty.

Find a PLC repair specialiston RepairMode.com ↗

Common 1785-L11B failures

Failure patterns we regularly see on PLC-5 processor hardware like the 1785-L11B:

Memory errors after a chassis power supply brownout
ControlNet channel faults on -C processors
Program lost on power cycle: BATT LED on, backup battery (1770-XYC) depleted
PROC LED red (major fault) at power-up that returns after clearing
DH+ or Remote I/O channel dead: failed channel transceiver on the 3-pin blue-hose port

Repair or replace?

ReplaceReplacement PLC-5 units are usually surplus or refurbished. Replace the 1785-L11B if it is dead or faulting and you have a current program backup. Check that the series and firmware match your project first. The 1785-L11B is on our shelf now and ships the same day for orders placed before 5:00 PM Central.

RepairRepair keeps the exact 1785-L11B your program and licensing were validated on and can preserve the memory contents when no backup exists. It is usually the better call for battery-holder corrosion, a damaged comm port or a failed power section when matching stock is scarce. The two 1785-L11B symptoms we see most often are “Program lost on power cycle” and “PROC LED red (major fault) at power-up”. If a replacement is already installed, repairing the failed 1785-L11B gives you a tested spare on the shelf, which is worth more on an older platform where a matching unit can take time to source. Each 1785-L11B we repair goes back function-tested with a 1-year warranty.

Related services: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 condition is the 1785-L11B in?

NJT Automation currently has 1 unit of the 1785-L11B in stock in unused surplus condition (Series D). Each listing states its own condition and series. Clean used pull with full functionality. Minimal cosmetic wear and backed by our 1-year warranty.

When does this part ship?

1 unit of the 1785-L11B are on the shelf in Milwaukee, WI, priced from $549.99. Orders before 5:00 PM Central on a business day ship the same day; next-day air is available at checkout.