Allen-Bradley 1785-L80E/ST0WO1WX PLC-5 Programmable Controller | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1785-L80E/ST0WO1WX is a high-performance programmable controller from Rockwell Automation’s legendary PLC-5 series. Designed for large-scale industrial automation, this controller delivers robust Ethernet connectivity, extensive I/O capacity, and proven reliability in demanding manufacturing environments. Whether you are maintaining an existing PLC-5 installation or evaluating migration paths, this guide provides the technical depth and selection clarity you need.
Technical Specifications
- Manufacturer: Allen-Bradley / Rockwell Automation
- Part Number: 1785-L80E/ST0WO1WX
- Series: PLC-5
- Processor Type: Enhanced PLC-5 with Ethernet (10/100 Mbps)
- Memory: 100K words user memory
- Communication Ports: Ethernet/IP, DH+, Remote I/O
- Max I/O: Up to 3,072 digital I/O points
- Programming Software: RSLogix 5 (Ladder Logic)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Power Supply: Requires external 1771-series chassis and power supply
- Chassis Compatibility: 1771-A1B through 1771-A4B series chassis
- Weight: Approx. 300 g
- Certifications: UL, CE (verify with current Rockwell documentation)
Compatible Replacement & Equivalent Models
When the 1785-L80E/ST0WO1WX is unavailable or when a system upgrade is required, the following models are commonly evaluated as replacements or equivalents. Always verify compatibility with your specific application before substitution.
- Allen-Bradley 1785-L80B — Same PLC-5/80 processor family, DH+ only (no Ethernet); suitable for non-networked legacy systems.
- Allen-Bradley 1785-L60B / 1785-L60E — PLC-5/60 series; lower memory (64K words); suitable for mid-scale applications.
- Allen-Bradley 1785-L40E — PLC-5/40 with Ethernet; 32K words memory; suitable for smaller I/O counts.
- Allen-Bradley ControlLogix 1756-L8x series — Modern migration path; requires I/O adapter conversion and RSLogix 5000/Studio 5000 reprogramming.
- Allen-Bradley CompactLogix 1769-L3x series — Compact migration option for smaller PLC-5 installations.
Note: Direct drop-in replacement is not guaranteed. Program conversion and I/O remapping may be required for ControlLogix/CompactLogix migration.
Why Choose the Original Model
- Zero reprogramming cost: The 1785-L80E/ST0WO1WX is a direct hardware replacement for existing PLC-5/80E installations — no ladder logic conversion required.
- Maximum I/O capacity in the PLC-5 family: The L80E variant supports the largest I/O count in the PLC-5 series, making it the preferred choice for high-density legacy systems.
- Ethernet/IP native: Unlike earlier PLC-5 models, the L80E includes onboard Ethernet, enabling integration with modern SCADA and MES systems without additional communication modules.
- Proven field reliability: Thousands of PLC-5/80E units remain in active service globally across automotive, oil & gas, and heavy manufacturing sectors.
- Lowest total replacement risk: Maintaining the original hardware eliminates the engineering, validation, and downtime costs associated with platform migration.
Typical Applications
- Automotive assembly line control and body welding systems
- Oil & gas pipeline monitoring and pump station automation
- Water and wastewater treatment plant control
- Cement and mining process control
- Power generation and substation automation
- Food and beverage batch processing
- Chemical plant distributed control integration
System Compatibility
- Chassis: Allen-Bradley 1771-A1B, 1771-A2B, 1771-A3B1, 1771-A3B2, 1771-A4B
- Power Supplies: 1771-P4S, 1771-P6S, 1771-P7 series
- I/O Modules: Full 1771-series I/O module compatibility
- Programming Software: RSLogix 5 v8.x and above
- Communication: Compatible with 1784-PKTX, 1784-U2DHP (USB-to-DH+) programming cables
- SCADA Integration: Compatible with FactoryTalk View, Wonderware, and third-party OPC-DA/OPC-UA servers via Ethernet/IP
Selection Guide
Use the following criteria to determine whether the 1785-L80E/ST0WO1WX is the right choice for your application:
- Keep original hardware if: Your existing program is in RSLogix 5 ladder logic, your I/O count exceeds 2,000 points, and downtime for migration is not acceptable.
- Consider 1785-L60E if: Your I/O count is below 2,000 points and memory usage is under 64K words — the L60E offers a cost-effective alternative within the same platform.
- Consider ControlLogix migration if: You are planning a long-term modernization, require EtherNet/IP Device Level Ring (DLR) redundancy, or need integration with modern safety systems (GuardLogix).
- Consider CompactLogix migration if: The application is smaller in scale and rack space is limited.
Important: PLC-5 series has reached End of Life (EOL) status with Rockwell Automation. Spare parts availability is limited to the secondary market. Konmask.com specializes in sourcing verified surplus and refurbished PLC-5 hardware to extend the life of your existing installation.
Quality Assurance & Sourcing
- Visual & physical inspection: All units are inspected for physical damage, corrosion, and component integrity before listing.
- Functional verification: Where possible, units are powered on and communication ports are tested.
- Authenticity check: Serial numbers and firmware labels are verified against known Allen-Bradley manufacturing records.
- Packaging: Anti-static packaging with foam protection for safe international shipping.
- Warranty: 90-day replacement warranty against DOA (Dead on Arrival) defects.
How to Order
- Submit your inquiry via the Contact Us form or email support@konmask.com.
- Provide your required quantity, delivery timeline, and destination country.
- Our team will confirm stock availability and provide a formal quotation within 24 hours.
- Upon order confirmation, we arrange secure packaging and international shipping with full tracking.
- Export documentation (commercial invoice, packing list, COO) provided upon request.
Replacement & Compatibility FAQ
Q: Can I replace a 1785-L80E with a 1785-L80B without reprogramming?
A: Yes, the hardware is compatible and the program can be transferred directly. However, the L80B does not have onboard Ethernet — you will lose Ethernet/IP connectivity unless an external communication module is added.
Q: Is the 1785-L80E/ST0WO1WX still manufactured by Rockwell Automation?
A: No. The PLC-5 series has reached End of Life (EOL). New units are no longer manufactured. Konmask.com sources verified surplus and refurbished units from the secondary market.
Q: What programming cable do I need to connect to the 1785-L80E?
A: For DH+ programming, use the 1784-U2DHP USB-to-DH+ adapter. For Ethernet programming, a standard Ethernet cable connected to the onboard port is sufficient with RSLogix 5.
Q: Can I migrate my PLC-5 program to ControlLogix?
A: Yes. Rockwell Automation provides the RSLogix 5 to Studio 5000 migration tool. However, I/O addressing, instruction set differences, and communication configurations must be carefully reviewed. This is a significant engineering project and should be planned accordingly.
Q: What is the lead time for the 1785-L80E/ST0WO1WX?
A: Lead time depends on current stock. Please contact us for real-time availability. We typically ship within 3–7 business days for in-stock items.
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Contact: support@konmask.com | +0086 19859288691
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