One New AB CompactLogix 5370 Controller 1769-L16ER-BB1B In Box

Allen-Bradley 1769-L16ER-BB1B | CompactLogix 5370 L1 Controller — 384KB, Dual Ethernet / DLR, 16 DI / 16 DO

Part Number: 1769-L16ER-BB1B

Manufacturer: Rockwell Automation / Allen-Bradley (USA)

Product Type: CompactLogix 5370 L1 Programmable Automation Controller (PAC)

Memory: 384 KB user memory 

Compact Controller, Complete Feature Set

The 1769-L16ER-BB1B is the entry-level controller in Allen-Bradley's CompactLogix 5370 L1 family — a full Logix PAC that integrates power supply, embedded I/O, and dual EtherNet/IP communication in a single compact unit. It runs Studio 5000 Logix Designer, shares the same network protocol and programming environment as ControlLogix, and supports all four IEC 61131-3 programming languages: Ladder, Structured Text, Function Block, and Sequential Function Chart.

The dual Ethernet ports with DLR (Device Level Ring) capability provide network resiliency out of the box. If one cable or switch port fails, the ring topology reroutes communication automatically — without any additional hardware. The integrated switch allows the controller to connect to two network devices using a single IP address, simplifying panel wiring.

With 32 embedded I/O points (16 DI + 16 DO) and six POINT I/O expansion slots, many small-to-medium machine control applications are served without any external I/O modules. For larger I/O requirements, 1734 POINT I/O modules mount directly to the right of the controller on the same DIN rail.

Key Specifications

FAQ

Q1: The 1769-L16ER-BB1B is listed as CompactLogix 5370 L1. How does it compare to the L2 and L3 families?

The L1 is the entry point — compact size, embedded I/O, and POINT I/O expansion. The L2 and L3 families step up to larger memory, more I/O expansion capacity, and higher connection counts. For small to medium machines with up to 6 local expansion modules and 384 KB program size, the L1 is the right choice. Use L2 or L3 when memory or I/O scale requirements exceed L1's limits.

Q2: Does the 1769-L16ER-BB1B support CIP Motion for servo control?

No. The 1769-L16ER-BB1B does not support CIP Motion (integrated servo control). For servo axis control via EtherNet/IP, the CompactLogix 5370 L3 family or ControlLogix is required. The L16ER-BB1B controls motion through standard I/O and drive parameters, not the CIP Motion protocol.

Q3: Can this controller be programmed remotely over Ethernet without USB access?

Yes. The two EtherNet/IP ports support remote programming via Studio 5000 over a network connection. USB is provided for direct workbench programming or firmware updates. Both methods are available simultaneously.

Q4: The controller is new-in-box. Should the firmware be updated before deploying to a new machine?

Yes. Rockwell releases firmware updates periodically for security patches and feature improvements. Check the installed firmware version against the current release on Rockwell's Product Compatibility and Download Center (PCDC) before commissioning, particularly if the application will integrate with other Logix controllers or safety modules.

Q5: What is the difference between the BB1B and BB1C series suffix variants?

The suffix letter (B, C) identifies the hardware revision. Successive revisions incorporate component updates or minor circuit improvements. Both serve the same CompactLogix 5370 L1 application. The program and configuration are fully portable between revisions.