Allen-Bradley 1757-PLX52 ProcessLogix Processor – Rockwell Automation ProcessLogix System
When the central processor of a continuous process control system fails or goes offline without a qualified replacement on hand, the consequences extend far beyond a simple production pause. Batch integrity is lost, safety interlocks may fall into undefined states, and the cost of an unplanned shutdown in a refinery, chemical plant, or pharmaceutical facility can reach tens of thousands of dollars per hour. The Allen-Bradley 1757-PLX52 is the processor module that keeps that scenario from becoming reality — a purpose-built controller designed for the demanding, uninterrupted duty cycles of process manufacturing.
Within the Rockwell Automation ProcessLogix family, the 1757-PLX52 occupies the mid-to-upper tier of processing capacity, offering expanded memory and throughput compared to the entry-level PLX51 while sharing the same backplane, I/O infrastructure, and RSLogix 5000 / RSView programming environment as the broader ControlLogix ecosystem. Introduced as part of Rockwell’s strategy to bridge traditional DCS functionality with PLC flexibility, the ProcessLogix platform gained significant adoption in oil & gas, specialty chemicals, and life sciences — sectors where regulatory traceability and continuous availability are non-negotiable.
Technical Specifications
Electrical
- Backplane Power Consumption: 4.5 W (typical)
- Backplane Compatibility: 1757-A7, 1757-A13 ProcessLogix chassis
- Communication Ports: Dual RS-232 serial (DF1 / DH-485); EtherNet/IP via 1757-ENET bridge module
- Power Supply Requirement: 1757-PS1 or 1757-PS2 (chassis-mounted)
Processing & Memory
- User Memory: 2 MB (expandable via memory card)
- I/O Capacity: Up to 128,000 I/O points (distributed, via RIO and DeviceNet)
- Task Execution: Continuous, periodic, and event-driven tasks
- Scan Time: Sub-millisecond for time-critical loops
Mechanical
- Form Factor: Single-slot module, 1757 chassis
- Dimensions: Standard ControlLogix-family module profile
- Weight: Approx. 500 g
- Mounting: DIN rail or panel-mount chassis
Environmental
- Operating Temperature: 0 °C to 60 °C
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% (non-condensing)
- Vibration: IEC 68-2-6 compliant
- Enclosure Rating: Open-type (requires installation in rated enclosure)
Certifications & Standards
- UL Listed, CE Marked
- ATEX Zone 2 capable (with appropriate enclosure)
- Compliant with IEC 61131-3 programming standard
- RoHS compliant
Note: All specifications are based on Rockwell Automation publication 1757-TD001. Verify against the specific firmware revision installed on your unit.
Key Features & Benefits
- Dual-port serial communication — Supports simultaneous DF1 point-to-point and DH-485 network connections, eliminating the need for an external communication bridge in legacy panel architectures and reducing wiring complexity by up to 30%.
- IEC 61131-3 multi-language programming — Engineers can implement Ladder Diagram for discrete logic and Function Block Diagram for PID loops within the same project file, cutting cross-discipline programming time in hybrid process/discrete applications.
- Hot-swap chassis compatibility — The 1757-PLX52 supports removal and insertion under power (RIUP) within the ProcessLogix chassis, enabling module replacement during live production without a full system shutdown.
- Deterministic event-driven tasks — Event tasks execute within 1 ms of trigger, meeting the response-time requirements of IEC 61511 SIL-rated safety instrumented systems when used in conjunction with appropriate safety I/O.
- Unified RSLogix 5000 environment — Programming, diagnostics, and online editing use the same software platform as ControlLogix, reducing training overhead for facilities already running Allen-Bradley PLCs elsewhere on site.
- Broad distributed I/O reach — Native support for Remote I/O (RIO) and DeviceNet allows the processor to manage field devices distributed across large plant footprints without additional gateway hardware.
Industry & Equipment Applications
- Oil & Gas — Upstream & Midstream: Wellhead control panels, gas compression skids, pipeline SCADA nodes, and separator control systems where continuous uptime and remote diagnostics are mandatory.
- Chemical Processing: Reactor temperature and pressure loop control, batch sequencing for specialty chemical production, and interlock management in exothermic process units.
- Pharmaceutical & Life Sciences: FDA 21 CFR Part 11-compatible batch control, clean-in-place (CIP) sequencing, and environmental monitoring systems in GMP-regulated facilities.
- Power Generation: Auxiliary boiler control, turbine lube oil system management, and balance-of-plant automation in coal, gas, and biomass power stations.
- Pulp & Paper: Digester pressure control, bleach plant chemical dosing, and paper machine drive coordination requiring tight loop synchronization.
- Water & Wastewater Treatment: Pump station automation, chemical dosing control, and SCADA integration for municipal and industrial water treatment facilities operating under continuous duty cycles.
System Integration & Compatible Parts
Upstream / Power & Chassis:
- 1757-A7 (7-slot chassis), 1757-A13 (13-slot chassis)
- 1757-PS1 / 1757-PS2 power supply modules
Downstream / Communication & I/O:
- 1757-ENET — EtherNet/IP bridge for network integration
- 1757-SRM — System Redundancy Module for hot-standby configurations
- 1794-series FLEX I/O (via RIO adapter)
- 1756-series ControlLogix I/O (via 1757-FFLD bridge)
Equivalent / Replacement Considerations:
- 1757-PLX51 — Lower memory variant; suitable replacement only if user program fits within 1 MB and I/O count is below 64,000 points.
- 1756-L6x ControlLogix — Functional successor platform; migration requires chassis replacement, I/O re-mapping, and RSLogix 5000 project conversion. Not a drop-in substitute.
Our Quality Assurance Process
- Visual & Physical Inspection: Each unit is examined for connector pin integrity, label legibility, housing cracks, and evidence of prior repair or counterfeit markings before acceptance into inventory.
- Functional Power-On Test: Modules are bench-tested in a live 1757 chassis with a known-good power supply. Processor boot sequence, LED status indicators, and serial port communication are verified against factory specifications.
- Firmware Version Documentation: The installed firmware revision is recorded and disclosed to the buyer prior to shipment. Firmware upgrade support guidance is provided upon request.
- Packaging & ESD Protection: Units are shipped in anti-static bags with foam cushioning inside double-wall corrugated cartons, meeting ISTA 2A transit testing standards.
Available Documentation: Test report, firmware revision record, original Rockwell Automation datasheet (1757-TD001), certificate of conformance, and packing list with serial number.
How to Order
- Submit Your Inquiry: Send your part number (1757-PLX52), required quantity, and any firmware or condition requirements to support@konmask.com or use the contact form on this page.
- Receive Your Quote: Our technical team will confirm stock availability, unit condition, firmware revision, and pricing within 24 hours on business days.
- Confirm & Ship: Upon order confirmation, units are prepared, tested, and dispatched with full documentation. Express international shipping options are available.
Why Choose Konmask.com?
- Specialist inventory focus: We stock Allen-Bradley, Siemens, ABB, and Honeywell automation components specifically — not a general electronics distributor padding a catalog.
- Technical pre-sales support: Our team can advise on firmware compatibility, chassis slot requirements, and migration paths before you commit to a purchase.
- Documented traceability: Every unit ships with a test report and condition disclosure. No surprises on arrival.
- Global export experience: We handle export documentation, commercial invoices, and international freight coordination for buyers in Asia, the Middle East, and Europe.
- 24-hour inquiry response: We understand that unplanned downtime does not wait for business hours. Urgent inquiries receive priority handling.
Frequently Asked Questions
Q: Is the Allen-Bradley 1757-PLX52 compatible with RSLogix 5000, and which software version is required?
A: Yes. The 1757-PLX52 is programmed using RSLogix 5000 (now Studio 5000 Logix Designer). The minimum supported version depends on the firmware installed on your specific unit — typically v13 or later. We disclose the firmware revision with every unit so you can confirm compatibility with your existing software license before shipment.
Q: Can the 1757-PLX52 be used as a direct replacement for a failed 1757-PLX51 without reprogramming?
A: In most cases, yes — provided the existing user program does not exceed the PLX52’s memory capacity and the chassis and I/O configuration remain unchanged. The PLX52 uses the same backplane interface and instruction set as the PLX51. We recommend a full offline backup of the original program before any processor swap.
Q: What is the lead time for the Allen-Bradley 1757-PLX52 from Konmask.com, and do you ship internationally to countries like India, Saudi Arabia, or Germany?
A: For in-stock units, we typically ship within 2–3 business days of order confirmation. We export to customers across Asia-Pacific, the Middle East, South Asia, and Europe. Export documentation including commercial invoice and packing list is provided as standard. Contact us for freight options and estimated transit times to your location.
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