General Information

Core Description

Engineered to deliver high-performance scalability within a space-saving footprint, the 1769-L33ER is an Allen-Bradley CompactLogix 5370 L3 programmable automation controller equipped with 2 MB of user memory. This chassis-resident modular processor features dual integrated EtherNet/IP ports linked via an embedded internal switch to share a single IP address across Device Level Ring (DLR), linear, or star network topologies. It is designed to streamline complex machine-level applications, providing an optimized execution platform that eliminates heavy communication overhead while expanding local and distributed architecture constraints without hardware logic re-engineering.

Specific Application

• High-Performance Machine Automation: Managing synchronized operational scripts for indexing tables, custom packaging systems, cartoners, and process run-in assemblies.
• Distributed Network Loop Multiplexing: Coordinating high-availability I/O groupings across a single corporate or device-level network topology while utilizing embedded ring redundancy.

Ordering Information

System Compatibility

• System Compatibility: The 1769-L33ER hosts a high-capacity local backplane that supports up to 16 local 1769 Compact I/O modules split across a maximum of 2 expander banks, maintaining a physical power supply distance rating limitation of 4 modules per bank. It interfaces seamlessly with standard 1769 power supplies and can establish remote field clusters using 1734 POINT I/O via field adapter bridges. Software deployment requires the Studio 5000 Logix Designer platform (supporting a maximum limit of 32 networked EtherNet/IP nodes, 256 Logix connections, and 120 simultaneous TCP connections).
• Direct Application Alternates: 1769-L33ERM (Logix 5370 Integrated Motion Variant) and 5069-L320ER (Next-Generation CompactLogix 5380 Processor).
• Key Differences from Alternates (1769-L33ER vs. L33ERM / 5069-L320ER):
• Motion Axis Support: While both shared-footprint 5370 processors possess identical 2 MB capacities, the 1769-L33ER does not support integrated motion control over EtherNet/IP, whereas the 1769-L33ERM is specifically embedded with a co-processing layer capable of driving up to 8 synchronized axes.
• Network Speed & Addressing Mode: The next-generation 5069-L320ER introduces a Dual-IP mode that lets engineers assign separate network configurations to independent gigabit ports (10/100/1000 Mbps) for enterprise/device segregation. In contrast, the legacy 1769-L33ER operates at 10/100 Mbps and bridges its dual ports to a single IP address via its internal backplane hardware switch. Additionally, the 5069 series upgrades local module capability up to 31 Compact 5000 I/O modules.

Installation & Troubleshooting FAQ

Q1: What are the field limits regarding the mechanical alignment of expansion banks for a 1769-L33ER layout?

A: When configuring your local module layout, you must strictly respect the power supply distance rating. The 1769-L33ER cannot have more than 4 physical I/O modules located between itself and its localized power supply. If your system map expands past 8 modules, you must insert a secondary expansion cable and an auxiliary 1769 power supply to manage electrical bus losses across the multi-bank chassis.

Q2: Why am I blocked from adding a 17th local I/O module to my active 1769-L33ER project configuration?

A: This is a firm hardware backplane architecture limitation. The 1769-L33ER processor has a maximum local module expansion capacity of exactly 16 modules distributed over 2 expansion rows. Attempting to register a 17th local card will cause a software compilation error. To scale further, you must leverage the controller's networking capacity to map remote nodes using a 1734-AENTR or 5069-AENTR network bridge.

Q3: What precautions must be taken if deploying a 1769-L33ER inside a heavy processing zone with airborne contaminants?

A: A standard 1769-L33ER lacks defensive circuit board sealing. If your machine enclosure is located near corrosive gases (such as ambient sulfur loops in wastewater or mining sectors), you should instead procure the 1769-L33ERMK variation. The "K" suffix designates a factory conformal coated variant optimized to prevent silver film decay and track shorts across vulnerable electronic traces.

Q4: How do the embedded EtherNet/IP ports handle high network traffic when configured in a Device Level Ring topology?

A: The dual ports behave as an internal three-port unmanaged switch. They carry the exact same internal network traffic profiles. When hooked into a DLR loop, the hardware actively monitors ring continuity. If a field cable snaps, the processor re-routes diagnostic packet streams through the remaining port within milliseconds to maintain active distributed communication without tripping a major processor fault.

Q5: What tool or process is needed to permanently back up nonvolatile user tags on a 1769-L33ER without using lithium batteries?

A: The 5370 series features battery-less data preservation. Upon a total backplane power drop, internal energy storage circuits dump active log tables onto the integrated memory card. The system comes shipped with a pre-installed 1784-SD2 (2 GB) Secure Digital nonvolatile memory card positioned inside its front panel bay. If larger firmware deployment storage is required for long-term field archiving, it can be replaced with a standard 1784-SD1 (1 GB) variant.

Certification

China CCC

Registro Italiano Navale

ATEX

American Bureau of Shippin

UK EX CERTIFICATE

UKCA DOC

MOROCCO DOC

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