Allen-Bradley 1785-L80E — Ethernet-Ready PLC-5 Programmable Logic Controller | PLC-5 Platform
Engineering Background
The Allen-Bradley PLC-5 family, developed by Rockwell Automation, has been the backbone of discrete and process manufacturing automation for over three decades. Designed for demanding industrial environments, the PLC-5 platform delivers deterministic scan-cycle performance, robust I/O handling, and multi-network connectivity that legacy and hybrid control architectures continue to rely on today.
Product Positioning
The 1785-L80E is the Ethernet-enabled flagship of the PLC-5 Enhanced series, offering 80K words of user memory and native 10/100 Ethernet/IP connectivity alongside DH+ and Remote I/O. It is the preferred choice for engineers modernizing legacy PLC-5 installations without full system replacement, or integrating older plant-floor assets into contemporary SCADA and MES networks.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1785-L80E |
| Platform | Allen-Bradley PLC-5 Enhanced Series |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| User Memory | 80K Words (80,000 words) |
| Communication Ports | Ethernet/IP (10/100 Mbps), DH+ (Data Highway Plus), Remote I/O (RIO) |
| Ethernet Protocol | EtherNet/IP (CIP over TCP/IP) |
| DH+ Data Rate | 57.6 Kbps / 115.2 Kbps / 230.4 Kbps (selectable) |
| Max Local I/O | 3,072 discrete I/O points (local chassis) |
| Max Remote I/O | Up to 32 remote I/O racks |
| Scan Time | Deterministic; program-dependent |
| Power Supply Voltage | Backplane-powered (1771 chassis) |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% non-condensing |
| Chassis Compatibility | 1771 I/O Chassis (all slot sizes) |
| Programming Software | RSLogix 5 (Rockwell Automation) |
| Programming Languages | Ladder Diagram (LD), Function Block (via add-on) |
| Certifications | UL, CE, CSA |
| Weight (approx.) | 300 g |
Proven Application Environments
- Automotive Manufacturing — Body-in-white assembly lines, paint shop conveyors, and press control systems requiring deterministic cycle times and high I/O density.
- Oil & Gas Processing — Wellhead automation, pipeline SCADA integration, and compressor station control where DH+ legacy infrastructure remains in service.
- Water & Wastewater Treatment — Pump station sequencing, chemical dosing control, and SCADA-linked remote monitoring via Ethernet/IP.
- Food & Beverage — Batch processing, filling line control, and CIP (Clean-In-Place) sequencing in hygienic production environments.
- Pulp & Paper / Metals — High-cycle discrete control and coordinated drive systems in continuous process lines.
- Legacy System Modernization — Drop-in replacement for 1785-L60E / L40E controllers in existing 1771 chassis without rewiring.
Engineering Advantages
- Dual-Network Architecture — Simultaneous Ethernet/IP and DH+ connectivity enables seamless integration between modern IT/OT networks and legacy plant-floor devices without protocol converters.
- 80K Word Memory Headroom — Largest memory footprint in the PLC-5 Enhanced series; accommodates complex ladder programs, large data tables, and extensive recipe management without memory constraints.
- Backward Compatibility — Full hardware and software compatibility with existing 1771 I/O modules, eliminating the need for I/O replacement during controller upgrades.
- RSLogix 5 Ecosystem — Supported by Rockwell’s mature RSLogix 5 programming environment with extensive library of function blocks, diagnostics, and online editing capability.
- Deterministic Scan Performance — Consistent, predictable scan cycles critical for synchronized motion, interlock logic, and safety-adjacent applications.
- Long Service Life — PLC-5 platform components remain widely available as surplus, extending asset life and reducing total cost of ownership for legacy installations.
System Architecture & Signal Flow
The 1785-L80E occupies a single slot in any 1771 I/O chassis and communicates with local I/O modules via the 1771 backplane. The integrated Ethernet/IP port connects directly to plant Ethernet switches (10/100 Mbps, RJ-45), enabling peer-to-peer messaging with ControlLogix, CompactLogix, or SCADA/HMI systems running FactoryTalk or third-party OPC-DA/UA servers. The DH+ port supports token-passing communication with other PLC-5, SLC 500, and MicroLogix controllers, as well as PanelView HMI terminals. Remote I/O (RIO) links extend discrete I/O to remote 1771 chassis across the plant floor via coaxial cable at up to 57.6 Kbps.
Typical signal flow: Field sensors/actuators → 1771 I/O modules → 1771 backplane → 1785-L80E CPU → Ethernet/IP → SCADA/MES / DH+ → HMI / Peer PLCs.
Sourcing & Quality Verification
All units offered by Konmask.com are sourced from verified industrial surplus channels and subject to the following pre-shipment checks:
- Visual inspection: housing integrity, connector condition, label legibility
- Firmware version documentation where accessible
- Functional power-on test (where applicable)
- Anti-static packaging with humidity indicator card
- Serial number recorded and traceable to shipment documentation
Units are sold as tested surplus / refurbished unless explicitly listed as new-in-box (NIB). Condition is clearly stated on each listing.
Procurement Process
- Confirm compatibility — Verify your 1771 chassis slot availability and existing I/O module catalog numbers. Confirm RSLogix 5 software license is available for programming.
- Request a quote — Contact support@konmask.com for volume pricing, lead time, and condition-specific availability.
- Place order — Orders processed within 1 business day. Export documentation (commercial invoice, packing list, COO) provided for international shipments.
- Shipping — DHL Express / FedEx International Priority standard. EXW Xiamen available for freight forwarder arrangements.
- After-sales support — Technical pre-sales consultation and post-delivery support available via email or WhatsApp (+86 198-5928-8691).
Technical FAQ
Q: Is the 1785-L80E compatible with ControlLogix chassis?
A: No. The 1785-L80E is designed exclusively for the 1771 I/O chassis. It is not physically or electrically compatible with ControlLogix (1756) or CompactLogix (1769) chassis.
Q: Can I use Studio 5000 to program the 1785-L80E?
A: No. The 1785-L80E requires RSLogix 5 (v8.x or later recommended). Studio 5000 / Logix Designer is for ControlLogix and CompactLogix platforms only.
Q: What is the difference between 1785-L80E and 1785-L80B?
A: The 1785-L80E adds native Ethernet/IP connectivity. The 1785-L80B has the same 80K memory but lacks the Ethernet port, relying solely on DH+ and RIO for network communication.
Q: Does Konmask provide a warranty?
A: Yes. A 90-day functional warranty is provided on all tested surplus units. Terms are detailed in our Refund & Warranty Policy.
Q: Can you supply multiple units or provide a blanket order?
A: Yes. Contact us for volume availability and scheduled delivery arrangements.
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