Allen-Bradley 1771-DXPS – Control Coprocessor | PLC-5 Series Platform
Engineering Background
The Allen-Bradley 1771-DXPS is a dedicated Control Coprocessor module designed for the PLC-5 family of programmable logic controllers, manufactured by Rockwell Automation (formerly Allen-Bradley). The PLC-5 platform has been a cornerstone of industrial automation since the 1980s, deployed across process control, discrete manufacturing, and critical infrastructure worldwide. The 1771-DXPS extends the computational capability of the PLC-5 rack by offloading specialized control tasks from the main processor, enabling deterministic, high-throughput control loops in demanding environments.
Product Positioning
The 1771-DXPS is engineered for facilities requiring enhanced processing capacity within existing PLC-5 rack architectures. It is the preferred solution for maintenance engineers managing legacy automation systems, system integrators extending PLC-5 platform life cycles, and procurement teams sourcing verified replacement modules to minimize unplanned downtime.
Complete Technical Specifications
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Part Number | 1771-DXPS |
| Module Type | Control Coprocessor |
| Platform | PLC-5 Series (1771 I/O Chassis) |
| Backplane Interface | 1771 I/O Chassis Backplane |
| Power Consumption | Refer to OEM documentation for slot current draw |
| 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 |
| Weight | 900 g (approx.) |
| Form Factor | Single-slot 1771 I/O module |
| Certifications | UL Listed, CE (refer to OEM datasheet for full listing) |
| Condition | Surplus / Refurbished – Tested & Verified |
Proven Application Environments
- Continuous Process Industries: Oil & gas, chemical, and refining plants running PLC-5-based DCS hybrid architectures.
- Discrete Manufacturing: Automotive assembly lines, metal stamping, and press control systems with high-speed I/O demands.
- Utilities & Power Generation: Water treatment, power distribution, and SCADA-integrated control panels.
- Food & Beverage: Batch processing and packaging lines requiring deterministic coprocessor support.
- Legacy System Maintenance: Facilities maintaining PLC-5 platforms beyond OEM support windows, requiring verified spare modules.
Engineering Advantages
- Offloaded Processing: Dedicated coprocessor architecture relieves the main PLC-5 CPU of intensive computation, preserving scan time integrity.
- Rack-Native Integration: Slots directly into the 1771 I/O chassis backplane — no external wiring or interface adapters required.
- Platform Longevity: Enables continued operation of proven PLC-5 infrastructure without full system migration, protecting capital investment.
- Deterministic Control: Supports time-critical control loops with predictable, repeatable execution cycles.
- Drop-In Replacement: Fully compatible with existing 1771-series rack configurations and PLC-5 programming environments (RSLogix 5).
System Architecture & Signal Flow
The 1771-DXPS resides in a standard 1771 I/O chassis alongside the PLC-5 processor module. Communication occurs over the 1771 backplane bus. The coprocessor receives task assignments from the main CPU, executes dedicated control algorithms independently, and returns results via shared backplane memory. This architecture ensures the main processor scan cycle is not burdened by coprocessor workloads, maintaining overall system determinism. Integration is managed through RSLogix 5 programming software using standard ladder logic and coprocessor instruction sets.
Sourcing & Quality Verification
- Source: Surplus industrial inventory from decommissioned and upgraded automation systems.
- Inspection: Each unit undergoes visual inspection, board-level examination, and functional power-on testing prior to listing.
- Authenticity: All modules are verified OEM Allen-Bradley hardware — no counterfeit or third-party clone components.
- Packaging: Anti-static bagged and foam-protected for safe international transit.
- Documentation: Original OEM part number label intact; serial number traceable on request.
- Warranty: 90-day operational warranty against DOA; extended warranty available upon request.
Procurement Process
- Confirm Compatibility: Verify your PLC-5 chassis model and firmware revision against the 1771-DXPS compatibility matrix (Rockwell Publication 1771-UM series).
- Request Quote: Contact support@konmask.com or call +0086 19859288691 for volume pricing, lead time, and availability confirmation.
- Place Order: Purchase directly via this listing or submit a PO for B2B procurement. Net-30 terms available for qualified accounts.
- Shipping: Orders dispatched within 1–3 business days. DHL / FedEx international express available. Export documentation provided for cross-border shipments.
- Incoming Inspection: Recommended — verify part number label, inspect for physical damage, and perform bench test before rack installation.
Technical FAQ
Q: Is the 1771-DXPS compatible with all PLC-5 processor variants?
A: The 1771-DXPS is designed for the 1771 I/O chassis platform. Compatibility depends on your specific PLC-5 processor model and firmware. Consult Rockwell Automation Publication 1771-UM for the full compatibility matrix or contact our technical team for pre-purchase verification.
Q: What programming software is required?
A: RSLogix 5 (Rockwell Automation) is the standard programming environment for PLC-5 series modules. Ensure your software version supports coprocessor instruction sets for the 1771-DXPS.
Q: Can this module be used as a direct replacement for a failed unit?
A: Yes. The 1771-DXPS is a drop-in replacement for existing installations. No chassis modification is required. Restore your application program from backup and verify I/O configuration after installation.
Q: Do you provide a test report or inspection certificate?
A: A functional test confirmation is available upon request. For critical applications, we recommend independent incoming inspection. Contact us for details.
Q: What is the lead time for bulk orders?
A: Standard single-unit orders ship within 1–3 business days. Bulk or multi-unit orders: contact us for availability and lead time. We maintain relationships with multiple surplus suppliers to support urgent procurement needs.
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Contact: support@konmask.com | +0086 19859288691
