Discrete Manufacturing & Process Control Solution — Allen-Bradley 1785-L11B | PLC-5 Series
Where This Product Is Used
The Allen-Bradley 1785-L11B is a mid-range processor from Rockwell Automation’s legacy PLC-5 platform, engineered for demanding industrial environments where deterministic scan times and robust I/O handling are non-negotiable. Engineers specify this controller across a wide range of sectors:
- Automotive Assembly Lines — Coordinating multi-axis motion, conveyor sequencing, and robotic cell interlocks where legacy PLC-5 infrastructure remains the backbone.
- Oil & Gas Processing Plants — Managing pump stations, valve actuators, and SCADA-linked remote I/O racks in hazardous-area control panels.
- Water & Wastewater Treatment — Supervisory control of aeration basins, clarifiers, and chemical dosing systems integrated with existing DH+ networks.
- Pulp & Paper Mills — High-speed process control for winders, dryers, and stock preparation lines requiring deterministic ladder-logic execution.
- Food & Beverage Production — Batch sequencing, CIP (Clean-In-Place) control, and line synchronization in facilities with established PLC-5 architectures.
- Mining & Minerals Processing — Crusher control, conveyor protection, and plant-wide interlocking in remote, high-vibration environments.
Technical Specifications
| Part Number | 1785-L11B |
| Series | PLC-5 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Processor Type | Programmable Logic Controller (PLC) |
| User Memory | 8K Words |
| Max Local I/O | 512 I/O Points |
| Communication Ports | Data Highway Plus (DH+), RS-232 |
| Programming Software | RSLogix 5 / 6200 Series |
| Backplane Compatibility | 1771 I/O Chassis |
| Power Supply | Requires 1771-P4 or compatible 1771-series PSU |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Weight | Approx. 1.2 kg |
| Product Status | Mature / End-of-Life (Rockwell); Replacement & Spare Parts Available |
Why Engineers Specify This Model
- Proven DH+ Network Integration — Native Data Highway Plus port enables seamless peer-to-peer messaging and SCADA connectivity in existing PLC-5 networks without gateway hardware.
- 8K Word Memory Headroom — Sufficient for complex ladder programs with extensive data tables, PID loops, and message instructions in mid-scale applications.
- 1771 I/O Ecosystem Compatibility — Directly slots into the vast installed base of 1771-series I/O chassis, eliminating costly chassis replacements during processor upgrades or spares replacement.
- Deterministic Scan Performance — Fixed-cycle scan architecture ensures predictable response times critical for safety interlocks and high-speed process control.
- Long Field Service Life — Designed for 24/7 continuous operation in industrial environments; widely supported by maintenance teams with decades of PLC-5 expertise.
- Cost-Effective Spares Strategy — Sourcing a verified 1785-L11B as a hot spare or direct replacement avoids the capital expenditure of a full ControlLogix migration project.
Complete System Bill of Materials
A fully operational 1785-L11B control system typically requires the following components:
- 1785-L11B — PLC-5 Processor (this item)
- 1771-A1B / A2B / A3B / A4B — 1771 I/O Chassis (4, 8, 12, or 16 slot)
- 1771-P4 / P4S / P6S — Power Supply Module
- 1771-IAD / OAD / OBD — Discrete Input / Output Modules (120VAC / 24VDC)
- 1771-IFE / OFE — Analog Input / Output Modules
- 1784-KTX / KTXD — DH+ Communication Card (for programming workstation)
- RSLogix 5 — Programming Software License (Rockwell Automation)
- 1761-CBL-PM02 — RS-232 Programming Cable
Contact support@konmask.com to source complete system BOM packages.
Compliance & Industry Standards
- UL Listed — UL 508 (Industrial Control Equipment)
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive
- IEC 61131-3 — Ladder Diagram (LD) programming language conformance
- NEMA / IEC Enclosure Ratings — Suitable for installation in NEMA 12 / IP54 or better enclosures
- RoHS — Original Rockwell Automation manufacturing compliant with applicable RoHS directives
Quality Assurance & Sourcing
At Konmask.com, every Allen-Bradley 1785-L11B unit undergoes a structured verification process before dispatch:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Label and date-code authentication against known Rockwell Automation manufacturing records
- Functional power-on test where applicable
- Secure anti-static packaging with humidity indicator cards for international shipment
- Full traceability documentation available on request
We source from authorized distributors, certified surplus channels, and direct factory-decommission lots — never from unverified grey-market brokers.
How to Source This Part
- Request a Quote — Email support@konmask.com with your required quantity, delivery timeline, and any condition requirements (new, refurbished, tested surplus).
- Phone / WhatsApp — Call or message +0086 19859288691 for urgent sourcing inquiries.
- Add to Cart — For standard in-stock units, proceed directly to checkout. Lead time and stock status confirmed at order.
- Bulk / Project Orders — For BOM-level procurement or multi-unit spares programs, contact us for volume pricing and consolidated shipping options.
Application-Specific FAQ
Q: Is the 1785-L11B compatible with ControlNet or EtherNet/IP?
A: No. The 1785-L11B communicates natively via Data Highway Plus (DH+) and RS-232. ControlNet and EtherNet/IP require a ControlLogix or CompactLogix platform. A 1784-PCMK or 1761-NET-AIC bridge can provide limited interoperability in some architectures.
Q: Can I program the 1785-L11B with Studio 5000?
A: No. The PLC-5 platform requires RSLogix 5 (or the legacy 6200 series software). Studio 5000 / Logix Designer is exclusively for the Logix5000 controller family.
Q: What is the recommended migration path from the 1785-L11B?
A: Rockwell Automation recommends migrating to the ControlLogix 5580 or CompactLogix 5380 platforms using the Migration Toolkit. Konmask can supply both legacy spares and migration-target hardware — contact us to discuss your project scope.
Q: Do you supply the 1785-L11B with a warranty?
A: Yes. All units sold through Konmask.com carry a minimum 90-day functional warranty. Extended warranty and exchange programs are available — inquire at the time of order.
Q: Can you supply multiple units for a spares program?
A: Yes. We regularly fulfill multi-unit spares orders for maintenance departments and EPC contractors. Contact us with your quantity and delivery schedule for a consolidated quote.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
