MicroLogix 1100 vs 1400: How to Choose (and Whether to Buy in 2026)

You're standing in front of an Allen-Bradley control panel-replacing a failed unit or specifying a new small machine - and the choice has narrowed to MicroLogix 1100 vs. 1400. Both look similar on paper, both still run on RSLogix 500, and both belong to a family Rockwell has openly deprioritized. The real question isn't only "which one fits"; it's "which one fits, can I still buy it in 2026, and how do I get a genuine unit on a reasonable lead time?"

This guide answers all three. We'll compare the two head-to-head with specs verified against Rockwell publications, walk through scenario-based selection, decode catalog numbers, look at current lifecycle status, and finish with the sourcing details that actually matter when a product line is going quiet.

Quick Verdict

If your application is a compact, single-network machine with light I/O and a tight budget, the MicroLogix 1100 is still the right call. If you need more I/O headroom, multiple serial protocols for legacy devices, higher-speed counting, or pulse-train outputs, step up to the MicroLogix 1400.

One caveat to keep in mind as you read: both families are legacy in 2026. We'll cover lifecycle and sourcing below. Need one now? Check current stock and lead time on our Allen-Bradley PLC catalog.

Where the 1100 & 1400 Fit in the MicroLogix Family

Before comparing them, it helps to see why these two-and not the others-are the live choice in 2026:

Above the MicroLogix line, Rockwell positions CompactLogix (modular, tag-based, Studio 5000) for full-machine control and ControlLogix for plant-wide systems. Below it sits the Micro800 (CCW software) for low-end OEM machines. The 1100 and 1400 are what's left of the RSLogix 500 small-PLC world that has powered packaging lines, water treatment skids, and HVAC for decades.

MicroLogix 1100 vs 1400: Head-to-Head Specs

Here's the verified comparison. Every value below is taken from Rockwell publications 1763-PP001 (MicroLogix 1100 product profile), 1766-UM001 (MicroLogix 1400 user manual), and the 1761-SG001 selection guide.

I/O & Expansion

The headline gap is 16 versus 32 onboard points and 144 versus 256 total with 1762 expansion. The trap most engineers fall into is sizing exactly to today's I/O count and getting boxed in within a year. A safe rule: if your worst-case I/O is above ~100 points or you expect even modest growth, the 1400's headroom is worth the cost difference. If you're firmly under 80 and unlikely to expand, the 1100 is more than enough. Above 200 points or distributed I/O on EtherNet/IP-you're outside MicroLogix territory and should be looking at CompactLogix.

Communication & Networking

This is where the 1100 and 1400 really split. Both speak EtherNet/IP at 10/100 Mbps, but the 1400 adds Modbus TCP/IP and DNP3 over IP natively, plus a second serial port. That second port matters more than it sounds: if you've inherited an HMI on RS-485, a Modbus RTU drive, and a serial barcode reader on the same machine, the 1100's single combo port forces you to multiplex with converters. The 1400 lets each device live on its own channel. For pure Ethernet machines with no legacy serial devices, the 1100 is genuinely fine.

Memory, Data Logging & Recipe

User program memory jumps from 4K words on the 1100 to 10K words on the 1400 - a 2.5× increase that matters less for simple ladder logic and a lot more for string handling, indirect addressing, or anything with structured data tables. Both controllers share the same 128 KB data logging and 64 KB recipe storage in battery-backed memory, so if your driver is trending or batch recipes, that's a wash. Where the 1100 runs out of room are programs that grew over the years with patch-on-patch logic, large string files, or expanded HMI tag dictionaries.

High-Speed I/O, PTO/PWM & Motion

The 1100 supports one high-speed counter channel via its four fast inputs (suitable for one encoder or a flow meter). The 1400 brings six HSC channels at 100 kHz and, on the DC-output models, up to three PTO/PWM channels for stepper-style positioning or simple single-axis motion. To be clear: neither is a motion controller. Multi-axis coordinated motion or high-dynamic positioning belongs on the CompactLogix 5380. But for indexers, single-axis pick-and-place, or pulse-driven dispensing, the 1400 is genuinely capable.

Display, Clock, Programming & Software

Both have an LCD, keypad, real-time clock, and online editing. Both programs with RSLogix 500 or RSLogix Micro-not Connected Components Workbench (CCW), which is the Micro800 platform and a common point of confusion. The 1400's LCD is backlit and supports more user-defined content. Otherwise, the programming and commissioning experience is nearly identical, which is exactly why customers move between the two without retraining.

Power & Form Factor

Both come in AC and DC power variants. The 1100 has four catalog numbers; the 1400 has twelve. The decision here is usually dictated by what supply already exists in the panel: cabinets with established 120/240 V AC feeds typically go to the AWA/BWA models, while cabinets with clean 24 V DC supplies favor BXB. Pick the wrong power class, and the controller doesn't just run inefficiently-it won't power up at all. We'll decode the suffixes properly in the catalog-number section below.

Which One Should You Choose? (Scenario-Based)

Specs only matter once you map them to your situation. Here are the patterns we see most often from customers asking us to quote one of these:

• Simple relay-replacement on a stand-alone machine, AC-powered, ≤ 20 I/O. Go with the 1100 (1763-L16AWA or L16BWA). The 1400 is over-spec for this.
• Process skid with a few analog signals, Ethernet HMI, and modest logic. 1100 with two 1762 analog modules is the cleanest fit. Add a 1762-IF4 if you need more channels.
• Packaging machine with encoder feedback, a stepper indexer, and a barcode reader. 1400 (DC output model, e.g., 1766-L32BXB) for the HSC + PTO + dual serial.
• Legacy line with Modbus RTU drives, a DH-485 HMI, and a DNP3 link to a remote panel. 1400-the only model in the MicroLogix family with all three protocols on board.
• Direct one-for-one replacement of an existing MicroLogix 1100 in the field. Stay on 1100. Swapping in a 1400 requires re-wiring (different I/O layout, different terminals) and isn't worth the disruption unless you also need the extra capability.

Not sure where your application lands? Send us the input/output list, and we'll suggest the exact catalog number-usually within a couple of hours during Shenzhen business time. Request a quote →

Decoding Catalog Numbers: Pick the Exact Model

Once you've picked a family, you still need the right suffix.

MicroLogix 1100 uses the format 1763-L16XYZ:

• L16 = 16-point controller
• X = input supply: A (120/240 V AC), B (24 V DC), D (12–24 V DC)
• Y = input type: W (AC) or B (DC, sinking/sourcing)
• Z = output type: A (AC + relay), B (relay + FET DC), D (DC relay)

MicroLogix 1400 uses 1766-L32XYZ(A) with twelve variants. Worked example - 1766-L32BXB: L32 = 32-point, B = 24 V DC input power, X = 24 V DC sinking/sourcing inputs, B = 24 V DC FET outputs. A trailing "A" (as in L32BXBA) signals embedded analog (4 AI + 2 AO).

The 1400 catalog numbers we ship most are 1766-L32BWA (AC power, relay output-the most universal), 1766-L32AWA (AC inputs and outputs), 1766-L32BXB (24 V DC throughout, FET outputs for PTO/PWM), and the L32xWAA / L32BXBA variants when embedded analog is needed.

Not sure which suffix maps to your existing wiring? Send us your current part number or the application we'll cross-reference before you commit.

Lifecycle & Obsolescence: Is It Still Worth Buying in 2026?

This is the question every customer eventually asks, and the honest answer requires some nuance.

As of early 2026, Rockwell's Product Lifecycle Status page lists the MicroLogix 1400 as Active and the MicroLogix 1100 as Active Mature. "Active" means full production and full support. "Active Mature" means full support continues but no new development-and a future end of life notice is expected before discontinuance. The MicroLogix 1000, 1200, and 1500 have already been discontinued. (Always verify the current status at the Rockwell Lifecycle Status page before a procurement decision.)

So the practical answer:

• Yes, the 1400 is still in production and can be specified for new short-to-medium-term builds (≤ 5 years of expected service).
• The 1100 can be bought today, but stock and support windows are shrinking. We recommend it for repair-in-kind or expansion of an existing 1100-based system, not for new clean-sheet designs.
• For new machines expected to run 7–10+ years, the migration math usually points to CompactLogix 5380 or Micro800-a separate project, not a same-week swap.

Decision checklist for an existing installation:

• Do you have a spare controller and a recent program backup? If not, buy a spare before anything else.
• Is the unit on a critical line where downtime costs more than migration? If yes, plan migration.
• Are you adding capability the current controller can't handle (more I/O, motion, or modern networking)? If yes, this is the moment to step up to CompactLogix.
• Low-risk, single-machine application that "just needs to keep running"? Replace in kind with a new MicroLogix and move on.

Migrating just to migrate, on a working line, usually doesn't pay back. Migrating because you're out of memory, I/O, or controller stock-that pays back.

Sourcing a MicroLogix 1100/1400: New, Surplus, or Refurbished

When a product line is mature or near end-of-life, where you buy matters as much as what you buy. Three options:

New from authorized channel. Lowest risk, full warranty, but pricing has climbed, and lead times from US-authorized distributors to overseas buyers have stretched.

New from independent stock (our core business). Factory-new units shipped from Shenzhen via DHL/FedEx/UPS in 3–7 working days, typically 20–40% below US list, with written warranty. The right channel for global buyers needing reasonable pricing and fast delivery.

Surplus and refurbished. Pulled from decommissioned systems, tested, and resold. Legitimate for legacy catalog numbers no longer in production. The risk is in testing depth and warranty terms.

Before any purchase, insist on the following in writing:

• Exact catalog number, series, and firmware revision. A 1766-L32BWA Series A is not the same as Series C in firmware compatibility.
• Date code - older controllers may have aged components even if "new in box."
• Warranty terms - duration, what's covered, return process.
• Delivery terms (Incoterms, customs handling)-surprise duties have killed more than one urgent project.
• For surplus/refurb: what testing was done and whether there's a DOA replacement window.

We ship both families worldwide, support customs documentation for non-US destinations, and back every unit with a written warranty. Send us a part number and quantity - we usually quote within hours.

What Else You'll Need: Compatibility & Replacement Parts

A bare controller rarely arrives in the panel alone. Common companion parts:

• 1762 Expansion I/O modules-the same family works on 1100, 1200, and 1400. Most shipped: 1762-IQ16 (16-pt 24 V DC input), 1762-OW16 (16-pt relay output), 1762-OB16 (16-pt 24 V DC FET output), 1762-IF4 (analog input), 1762-OF4 (analog output), 1762-IT4 (thermocouple), and 1762-IR4 (RTD). Full lineup on our Allen-Bradley PLC module page.
• 1766-MM1 - memory module for the 1400, used for backup and offline program transfer.
• 1763-BA / 1766-BA - replacement lithium batteries for RTC and program retention. Consumables; budget replacement every 4–5 years.
• Communication cables - 1761-CBL-PM02 (RS-232 to D-shell) and standard Ethernet patch cables for the IP port.

When replacing a failed unit, match the full catalog number, including the suffix, not just the family. A 1763-L16BWA cannot drop into a panel wired for a 1763-L16AWA - the input voltage class is different.

Programming & Getting Started

Both controllers use RSLogix 500 (paid) or RSLogix Micro Starter / Developer (lower-cost) for ladder programming, debugging, and online editing. Studio 5000 is the CompactLogix/ControlLogix toolchain-not used here. CCW is Micro800-not used here either.

Practical tips for commissioning:

• Check the firmware revision before going online. RSLogix 500 versions track controller series; mismatched combinations can prevent connection.
• Use the LCD to set the IP address before plugging into a network - faster than BOOTP/DHCP for one-off setups.
• For EtherNet/IP messaging to a CompactLogix or PanelView, use MSG instructions on the MicroLogix side; Logix tag-style addressing is not native.

The authoritative references are Rockwell publications 1763-UM001 (MicroLogix 1100) and 1766-UM001 (MicroLogix 1400).

FAQ

 

 

Where can I buy genuine units with warranty and fast lead time?

We stock both families in Shenzhen and ship globally with written warranty. Request a quote or WhatsApp +86 189 2643 1543 with your catalog number and quantity.

How much does a 1766-L32BWA cost?

From our Shenzhen stock, factory-new units land well below the US authorized list with DHL/FedEx delivery in most regions inside a week. Send the quantity for a current quote.

Is the MicroLogix 1100/1400 discontinued in 2026?

No. The 1400 (Bulletin 1766) is active and still in production. The 1100 (Bulletin 1763) is active mature-still available, no longer in active development. Both are buyable today.

What's the main difference between the 1100 and 1400?

The 1400 doubles embedded I/O (32 vs 16), expands to 256 I/O (vs 144), adds a second serial port, supports DNP3 and Modbus TCP natively, provides six 100 kHz HSC channels plus PTO/PWM, and offers 2.5× more program memory.

Can a 1400 directly replace a 1100?

Functionally, yes-the 1400 is a superset. Physically no-terminal layout, wiring, and panel cutout differ. Plan for rewiring if you're swapping families.

What replaces the MicroLogix series long-term?

Rockwell's migration paths are Micro800 (low-end, CCW) and CompactLogix 5380 (mid-range, Studio 5000). The 5380 is the most natural upgrade for more I/O, integrated motion, or tag-based programming.

Conclusion & Get a Quote

If your application fits inside 16 embedded I/O, a single Ethernet port, and 4K words of program, the MicroLogix 1100 is the right answer and the cheaper one. If you need 32 embedded I/O, dual serial, multi-protocol networking, real high-speed counting, or pulse outputs, the 1400 earns its premium. For brand-new long-life designs, plan a migration to CompactLogix 5380 or Micro800 instead.

Whichever you choose, the harder problem in 2026 is getting a genuine unit on a sensible lead time. Send us your catalog number and quantity - we'll come back with current stock, lead time, written warranty terms, and a price in the same business day.

Request a Quote | WhatsApp: +86 189 2643 1543 | Email: jerry@szct-automation.com

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