Allen-Bradley 1769-L35ER CompactLogix 5370 Dual EtherNet/IP PLC Controller

Description

Key Technical Specifications

The 1769-L35ER is a CompactLogix 5370 L3 controller featuring 3 MB of user memory, dual embedded EtherNet/IP ports, support for up to 30 local 1769 Compact I/O modules, and an industrial SD card for nonvolatile storage. It is part of the CompactLogix 5370 family and remains an Active Mature product.

Product Introduction

The Allen-Bradley 1769-L35ER is a high-performance CompactLogix 5370 controller designed for machine automation and distributed process control. It combines Logix control, high-speed EtherNet/IP communications, and modular 1769 Compact I/O expansion into a compact controller suitable for demanding industrial applications.

The controller incorporates two embedded Ethernet ports, enabling star, linear, or Device Level Ring (DLR) network topologies without requiring an additional communication module. This simplifies network architecture while supporting communication with HMIs, PowerFlex drives, distributed I/O adapters, and other EtherNet/IP devices.

With 3 MB of application memory, the 1769-L35ER is well suited for larger automation projects than the 1769-L33ER. The controller uses an internal supercapacitor rather than a replaceable battery for memory retention and supports industrial SD memory cards for project backup, firmware management, and controller recovery.

1769-L35ER

1769-L35ER

1769-L35ER

Installation & Configuration Guide

Stage 1 – Pre-Installation Preparation (5–10 Minutes)

⚠️ Safety First

1. Notify production personnel before maintenance.
2. Follow Lock-Out/Tag-Out procedures.
3. Remove controller power.
4. Verify all status indicators are OFF.

Required Tools

• ESD wrist strap
• Digital multimeter
• Phillips screwdriver
• Cat5e/Cat6 Ethernet cable
• Laptop with Studio 5000 Logix Designer

Before Removal

• Upload and back up the PLC application.
• Record the firmware revision.
• Save the Ethernet IP configuration.
• Record the installed 1769 I/O configuration.
• Remove the SD card after power has been disconnected.

Stage 2 – Remove Existing Controller

1. Verify the power supply is OFF.
2. Disconnect Ethernet cables.
3. Remove the SD memory card if installed.
4. Release the locking mechanism.
5. Carefully remove the controller from the Compact I/O assembly.

⚠️ Inspect the CompactBus connectors before installing the replacement controller.

Stage 3 – Install the New Controller

1. Confirm the replacement catalog number is 1769-L35ER.
2. Install the controller onto the Compact I/O bus.
3. Reinstall the SD memory card.
4. Connect the Ethernet network.
5. Download the controller project.
6. Verify the firmware revision before switching to RUN mode.

Installation Checklist

• ✔ Correct catalog number
• ✔ Firmware compatibility verified
• ✔ Ethernet communication established
• ✔ SD memory card installed
• ✔ Compact I/O modules recognized

Stage 4 – Commissioning & Functional Testing

1. Restore system power.
2. Verify the OK, RUN, and NET LEDs.
3. Connect using Studio 5000 Logix Designer.
4. Confirm all local and remote I/O modules are online.
5. Verify communication with HMIs, drives, and remote I/O.
6. Perform a complete functional test before returning the machine to production.

⚠️ Troubleshooting

• Project download fails: verify Studio 5000 supports the installed firmware.
• Ethernet communication issues: confirm the IP address, subnet mask, and DLR configuration.
• Remote I/O faults: verify EtherNet/IP adapter configuration.
• Unexpected controller faults: check firmware compatibility and diagnostic logs.

Frequently Asked Questions

Q1. What is the difference between the 1769-L35ER and the 1769-L35ERM?

The 1769-L35ER is intended for standard automation applications. The 1769-L35ERM adds integrated CIP Motion capability for coordinated servo motion systems. Select the ERM model only if your application requires integrated motion control.

Q2. How much memory does the controller provide?

The controller provides 3 MB of user memory and supports an industrial SD memory card for project backup, firmware updates, and recovery.

Q3. How many I/O modules can the controller support?

The supports up to 30 local 1769 Compact I/O modules, depending on system power budgeting and configuration requirements.

Q4. Does the controller require a backup battery?

No. The controller uses an internal supercapacitor to maintain memory during temporary power interruptions, eliminating the need for routine battery replacement.

Q5. Which programming software is compatible?

The controller is programmed using Studio 5000 Logix Designer. The installed Studio 5000 version must support the controller firmware revision before an application can be downloaded successfully.

Q6. What should I verify before ordering?

Confirm the following:

• Catalog number ()
• Firmware revision
• Studio 5000 software compatibility
• Required user memory capacity
• Number of local 1769 Compact I/O modules
• EtherNet/IP network architecture
• SD memory card requirements
• Panel space and power supply capacity

A frequent cause of commissioning delays is a mismatch between the controller firmware and the installed version of Studio 5000 Logix Designer. Verifying software compatibility before installation helps prevent download errors and reduces startup time