Allen-Bradley 1769-L30ER – CompactLogix 1769 Series Modules

Technical Dossier

Product Details And Specifications

Allen-Bradley CompactLogix 1769 Series Technical Notes

The Allen-Bradley CompactLogix 1769 series is a mid-range programmable logic controller (PLC) platform developed by Rockwell Automation. It occupies a defined position between the MicroLogix and ControlLogix families in the Rockwell automation hierarchy. The 1769 series is deployed across a broad spectrum of heavy industrial environments including petrochemical refineries, nuclear auxiliary systems, pulp and paper mills, automotive assembly lines, and water treatment facilities. Its compact form factor, combined with EtherNet/IP native connectivity and IEC 61131-3 programming compliance, has made it a standard specification item in distributed control system (DCS) architectures globally.

The 1769-L30ER specifically is a 1 MB user memory EtherNet/IP controller with dual EtherNet/IP ports, supporting Device Level Ring (DLR) topology for high-availability network configurations. It supports up to 16 local 1769 I/O modules and is compatible with Studio 5000 Logix Designer v21 and later.

The Evolution of CompactLogix 1769 Architecture

The CompactLogix platform was introduced in the early 2000s as Rockwell Automation's response to demand for a scalable, rack-based controller that did not require the full infrastructure of the ControlLogix 1756 chassis. The original L20, L30, and L40 controllers used serial and DeviceNet communication. The transition to EtherNet/IP-native controllers (the "ER" suffix generation) marked a significant architectural shift, enabling integration with modern SCADA and MES layers without protocol conversion gateways.

Key architectural milestones:

• Gen 1 (L20/L30/L40): Serial RS-232 and DeviceNet communication. Limited memory (512 KB). No embedded EtherNet/IP.
• Gen 2 (L23E/L32E/L35E): Introduced embedded EtherNet/IP single port. Expanded I/O capacity.
• Gen 3 (L30ER/L33ER/L36ERM): Dual-port EtherNet/IP with DLR support. Motion control integration via Sercos and EtherNet/IP drives. Studio 5000 compatibility.
• Current/Successor (5380 series — 5069-L306ER, 5069-L310ER): CompactLogix 5380 replaces the 1769 series for new installations. Higher throughput, USB programming port, expanded memory up to 10 MB.

The 1769 series is now in the mature/end-of-life transition phase. Rockwell Automation has announced migration paths to the 5380 platform. However, installed base volumes in legacy facilities ensure continued demand for 1769 spare parts and replacement modules through at least 2035.

CompactLogix 1769 Full Catalog & Functionalities (SKU List)

Controllers (CPU Modules)

• 1769-L16ER-BB1B: 384 KB memory, 16 I/O modules, single EtherNet/IP port, CompactLogix 5370 L1 controller.
• 1769-L18ER-BB1B: 512 KB memory, 18 I/O modules, dual EtherNet/IP, DLR support, CompactLogix 5370 L1.
• 1769-L24ER-QB1B: 750 KB memory, 16 I/O modules, dual EtherNet/IP, CompactLogix 5370 L2 controller.
• 1769-L27ERM-QBFC1B: 1 MB memory, motion control, 16 I/O modules, CompactLogix 5370 L2 with EtherNet/IP motion.
• 1769-L30ER: 1 MB memory, 16 I/O modules, dual EtherNet/IP, DLR, CompactLogix 5370 L3 — this page's primary SKU.
• 1769-L30ERM: 1 MB memory, motion control variant of L30ER, supports up to 16 CIP Motion axes.
• 1769-L30ER-NSE: 1 MB memory, non-safety variant, no safety I/O support, cost-optimized L3 controller.
• 1769-L33ER: 2 MB memory, 16 I/O modules, dual EtherNet/IP, DLR, CompactLogix 5370 L3.
• 1769-L33ERM: 2 MB memory, motion control, up to 16 CIP Motion axes, CompactLogix 5370 L3.
• 1769-L36ERM: 3 MB memory, motion control, up to 20 CIP Motion axes, highest-capacity L3 controller.

Digital Input (DI) Modules

• 1769-IQ16: 16-point 24V DC sink/source digital input module, standard density.
• 1769-IQ32: 32-point 24V DC digital input, high-density, dual-slot equivalent.
• 1769-IA8I: 8-point 120V AC isolated digital input module for high-voltage field devices.

Digital Output (DO) Modules

• 1769-OB16: 16-point 24V DC source digital output, 0.5A per point.
• 1769-OB32: 32-point 24V DC source digital output, high-density.
• 1769-OA8: 8-point 120/240V AC digital output module.

Analog Input (AI) Modules

• 1769-IF4: 4-channel analog input, 4–20 mA / 0–10V, 14-bit resolution.
• 1769-IF8: 8-channel analog input, differential or single-ended, 16-bit resolution.

Analog Output (AO) Modules

• 1769-OF4: 4-channel analog output, 4–20 mA / 0–10V, 14-bit resolution.

Communication & Specialty Modules

• 1769-L30ER (embedded): Dual EtherNet/IP ports with integrated DLR switch — no external adapter required.
• 1769-SDN: DeviceNet scanner module for legacy field device integration.

Power Supply

• 1769-PA2: 120/240V AC input power supply, 2A at 5V DC output, end-cap mounted.
• 1769-PB2: 24V DC input power supply, 2A at 5V DC output, end-cap mounted.

Sourcing Hard-to-Find & Obsolete CompactLogix 1769 Parts

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

Quality Control for the CompactLogix 1769 Range

The 1769 series presents specific test challenges due to its integrated backplane bus architecture and the tight coupling between the controller's local I/O bus and the EtherNet/IP communication stack. DriveKNMS applies the following test protocol to all 1769 modules prior to dispatch:

• Backplane continuity test: Verification of all backplane connector pins against OEM pinout specifications using automated bed-of-nails fixtures.
• Firmware version audit: All controllers are checked for firmware revision compatibility with Studio 5000 v21–v36 environments.
• EtherNet/IP port functional test: Both ports on dual-port controllers are tested for link establishment, DLR participation, and CIP message throughput at 100 Mbps.
• I/O module channel-level verification: Each analog and digital channel is individually stimulated and measured against OEM accuracy specifications.
• RFQ terms review: Commercial terms are confirmed during RFQ review based on model, condition, documentation, quantity and destination.
• Cosmetic and label inspection: Catalog number, series letter, and firmware label integrity verified against shipment documentation.