Allen-Bradley 1769-L35E – EtherNet/IP-Enabled CompactLogix Processor | CompactLogix 5300 Series
Engineering Background: The Allen-Bradley CompactLogix platform occupies a critical mid-range position in Rockwell Automation’s Logix control architecture, bridging the gap between entry-level MicroLogix systems and the full-scale ControlLogix chassis. Within process-intensive industries—petrochemical refining, power generation, and municipal water treatment—the CompactLogix 5300 series is the de facto standard for distributed control nodes that demand deterministic scan times, native EtherNet/IP connectivity, and seamless integration with Studio 5000 Logix Designer. The 1769-L35E specifically serves as the network-capable controller in this series, enabling direct participation in a Plant-wide Optimization (PWO) architecture without requiring a separate communication bridge module.
Product Positioning: The 1769-L35E is distinguished from the base 1769-L35 by its integrated EtherNet/IP port, eliminating the need for a 1761-NET-ENI or similar adapter in networked deployments. Compared to the 1769-L32E (1.0 MB user memory, 16 I/O modules), the L35E provides 1.5 MB user memory and supports up to 30 CompactLogix I/O modules—making it the correct selection for applications with dense analog I/O, motion axes, or complex ladder/function block programs exceeding 500 rungs. It is not suited for safety-rated SIL 2/3 applications (which require GuardLogix) or applications requiring more than 30 local I/O modules (which require ControlLogix).
Complete Technical Specifications
Electrical
- User Memory: 1.5 MB
- I/O Memory: 128 KB
- Communication Ports: 1× EtherNet/IP (10/100 Mbps, RJ-45), 1× RS-232 (DF1/DH-485)
- Backplane Current Draw: 800 mA @ 5 VDC; 3 mA @ 24 VDC
- Power Supply Compatibility: 1769-PA2, 1769-PB2, 1769-PA4, 1769-PB4
- Maximum Local I/O Modules: 30
- Maximum Tasks: 32 (1 continuous, 31 periodic/event)
- Maximum Programs per Task: 100
Mechanical
- Dimensions (H × W × D): 90 mm × 35 mm × 87 mm
- Weight: Approx. 300 g
- Mounting: DIN rail or panel mount via 1769 bus end cap
- Keyswitch Positions: RUN / PROG / REM
- Battery: 1769-BA (lithium, user-replaceable)
Environmental
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5% to 95% (non-condensing)
- Vibration: 2 g @ 10–500 Hz (IEC 68-2-6)
- Shock: 30 g operational (IEC 68-2-27)
- Pollution Degree: 2
- IP Rating: IP20 (open-type, requires enclosure)
Certifications
- UL Listed: UL 508
- CE Marked: EN 61131-2, EMC Directive 2014/30/EU
- cUL Listed (Canada)
- RCM (Australia/New Zealand)
- ATEX / IECEx: Not rated (standard version)
Data source: Rockwell Automation Publication 1769-UM011D-EN-P and 1769-TD005B-EN-P Technical Data Sheet.
Proven Application Environments
- Petrochemical Refining: Crude distillation unit | Pump and valve sequencing | Continuous 24/7 operation with 500 ms scan cycle requirements
- Power Generation: Coal/gas-fired boiler auxiliary systems | Burner management pre-interlock logic | High-frequency analog input polling from pressure transmitters
- Municipal Water Treatment: SCADA-integrated lift station control | Remote I/O over EtherNet/IP | Unattended operation with watchdog-triggered safe-state output
- Automotive Manufacturing: Body-in-white welding cell | Coordinated motion with PowerFlex 525 drives | Cycle time ≤ 10 ms with event-triggered tasks
- Food & Beverage Processing: CIP (Clean-in-Place) skid control | Sequential function chart (SFC) programming | Washdown environment with IP66 enclosure housing
- Pharmaceutical Batch Processing: ISA-88 batch recipe execution | Audit trail via FactoryTalk Historian integration | 21 CFR Part 11 compliant HMI pairing with PanelView Plus
Engineering Advantages
- For high-density analog I/O applications, this processor supports up to 30 local I/O modules, because the expanded backplane addressing eliminates the need for a remote I/O adapter in most mid-scale installations.
- For networked multi-controller architectures, this processor participates natively as both a CIP originator and target on EtherNet/IP, because the integrated port supports produced/consumed tags without additional communication modules.
- For applications requiring rapid commissioning, this processor is fully programmable in Studio 5000 Logix Designer v21 and above, because the firmware revision aligns with the current Rockwell Automation software ecosystem without legacy compatibility patches.
- For environments with power interruption risk, this processor retains program and data memory via the 1769-BA lithium battery, because non-volatile SRAM ensures deterministic recovery to last-known-good state on power restoration.
- For distributed control topologies, this processor supports Device Level Ring (DLR) media redundancy when paired with DLR-capable switches, because the EtherNet/IP port implements the CIP Sync protocol for fault-tolerant ring recovery under 3 ms.
- For maintenance-intensive facilities, this processor supports online program editing and partial import/export of routines, because the Logix Designer environment allows live modification without halting the continuous task scan.
System Architecture & Signal Flow
Field instruments (4–20 mA, discrete 24 VDC, thermocouple) → 1769 analog/digital I/O modules → CompactLogix backplane → 1769-L35E processor (ladder/FBD/SFC execution) → EtherNet/IP network → SCADA/HMI (FactoryTalk View SE / PanelView Plus) / upstream ControlLogix coordinator / historian.
Compatible Modules (verified):
- 1769-IF4 / 1769-IF8 – Analog input (4–20 mA / 0–10 V)
- 1769-OF4 / 1769-OF8C – Analog output
- 1769-IQ16 / 1769-OB16 – 24 VDC discrete I/O
- 1769-HSC – High-speed counter (encoder feedback)
- 1769-SDN – DeviceNet scanner (legacy field device integration)
- 1769-L35E is compatible with all 1769 Compact I/O modules; it is NOT compatible with 1756 ControlLogix I/O modules without a 1756-DHRIO bridge.
Substitution Conditions: The 1769-L35CR (CompactLogix with redundancy) is the correct upgrade path when high-availability requirements mandate controller redundancy. The 1769-L36ERM supports Integrated Motion on EtherNet/IP and should be selected when coordinated servo axis control is required. Direct substitution of the 1769-L35E with a 1769-L33ER requires firmware migration and memory reallocation review.
Sourcing & Quality Verification
Units offered through Konmask.com are sourced from authorized distribution channels and verified surplus inventory with documented chain of custody. All units undergo a 4-step incoming inspection before dispatch:
- Visual Inspection: Housing integrity, label legibility, connector pin condition, and keyswitch operation verified against Rockwell Automation factory standards.
- Firmware Verification: Firmware revision confirmed via RSLinx Classic or Studio 5000 online connection; revision documented on inspection record.
- Functional Power-On Test: Unit powered via 1769-PA2, communication established over EtherNet/IP, and diagnostic LED sequence confirmed (OK solid green, RUN solid green, FORCE off).
- Serialization Check: Serial number cross-referenced against Rockwell Automation’s Product Compatibility and Download Center (PCDC) for authenticity and recall status.
Available Documentation: Inspection report, firmware revision record, Rockwell Automation datasheet (1769-TD005B-EN-P), Declaration of Conformity (CE), and bill of materials upon request.
Procurement Process
- Submit Inquiry: Provide quantity, required firmware revision, and delivery timeline via support@konmask.com or the on-page inquiry form. A technical confirmation and price quotation will be returned within 24 hours on business days.
- Order Confirmation: Upon PO receipt, unit allocation is confirmed, inspection completed, and shipping documentation prepared. Export compliance (HS Code 8537.10) and commercial invoice issued as standard.
- Delivery & Commissioning Support: Technical support is available post-delivery for firmware upgrade guidance, RSLinx/Studio 5000 configuration, and I/O module compatibility verification. Support is provided via email and scheduled video call.
Technical FAQ
- Q: Is the 1769-L35E compatible with Studio 5000 Logix Designer v33 and later?
- A: Yes. The 1769-L35E supports firmware revisions up to 20.x. Studio 5000 v33+ maintains backward compatibility for offline programming and upload/download to controllers running firmware v16 and above. Confirm the target firmware revision matches the installed revision before going online.
- Q: Can the 1769-L35E directly replace a 1769-L32E in an existing panel?
- A: Mechanically and electrically, yes—both use the same 1769 backplane and power supply. However, the L35E has a larger memory footprint (1.5 MB vs. 1.0 MB) and supports 30 vs. 16 I/O modules. The existing program must be uploaded from the L32E, saved, and downloaded to the L35E after confirming firmware compatibility. No hardware wiring changes are required.
- Q: Does the 1769-L35E carry ATEX certification for use in Zone 2 hazardous areas?
- A: The standard 1769-L35E catalog number does not carry ATEX or IECEx certification. For Zone 2 (Gas Group IIC) installations, the controller must be housed in a certified Ex e or Ex p enclosure rated for the specific zone classification. Consult the enclosure manufacturer’s system certificate. For intrinsically safe field wiring, use certified IS barriers between the 1769 I/O modules and field instruments.
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