Allen-Bradley 1756-L73 Processor Module – ControlLogix Series
When a ControlLogix processor fails mid-production, the consequences are immediate and severe: assembly lines halt, batch processes abort, safety interlocks lose their logic engine, and every minute of downtime translates directly into lost revenue and missed delivery commitments. The 1756-L73 is not a peripheral component — it is the central intelligence of your entire control architecture. Without it, every I/O module, every drive, every networked device in the rack becomes inert hardware. Sourcing a verified, compatible replacement quickly is not optional; it is operationally critical.
Within the ControlLogix 1756 platform — Rockwell Automation’s flagship PLC family and the global benchmark for high-performance industrial control — the 1756-L73 occupies the upper-mid tier of the Logix5573 processor family. It delivers 8 MB of user memory, making it the preferred choice for applications that have outgrown the L71/L72 but do not yet require the full 16 MB headroom of the L74. Deployed across automotive assembly, oil & gas processing, water treatment, semiconductor fabrication, and discrete manufacturing worldwide, the 1756-L73 represents one of the most widely installed ControlLogix processors in the global installed base.
Technical Specifications
- Catalog Number: 1756-L73
- Series: ControlLogix (Logix5573)
- User Memory: 8 MB
- I/O Capacity: Up to 128,000 I/O points
- Communication Ports: USB (programming), EtherNet/IP via 1756-EN2T/EN3TR modules
- Backplane Communication: ControlBus (1756 chassis)
- Programming Software: Studio 5000 Logix Designer (v21 and above)
- Supported Languages: Ladder Diagram, Function Block Diagram, Structured Text, Sequential Function Chart, Motion Instruction Set
- Motion Control: Integrated CIP Motion (requires 1756-M0x servo modules)
- Energy Storage Module: 1756-ESMNSE (capacitor-based, no battery required)
- Operating Temperature: 0 °C to 60 °C
- Relative Humidity: 5% to 95% non-condensing
- Certifications: UL, CE, cUL, ATEX (zone 2 with appropriate housing)
- Form Factor: Single-slot ControlLogix chassis module
Key Features & Benefits
- 8 MB User Memory: Accommodates large ladder programs, extensive tag databases, and complex motion profiles without memory constraints.
- Integrated Motion & Process Control: A single processor handles both discrete I/O and coordinated multi-axis motion, eliminating the need for a separate motion controller.
- Redundancy-Ready: Fully compatible with the 1756-RM2/A redundancy module for hot-standby configurations in mission-critical applications.
- Producer/Consumer Networking: Native CIP messaging enables peer-to-peer data exchange across EtherNet/IP, ControlNet, and DeviceNet without polling overhead.
- Non-Volatile Memory Storage: Program and data can be stored to the 1784-CF128 CompactFlash card for fast recovery after power loss.
- Scalable Architecture: Operates in any 1756 chassis (4, 7, 10, 13, or 17 slots) and supports multi-chassis configurations via 1756-DHRIO or 1756-EN2T bridge modules.
- Firmware Revision Control: Field-upgradeable firmware via ControlFLASH utility ensures long-term supportability.
Industry & Equipment Applications
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, powertrain assembly cells
- Oil & Gas: Wellhead control panels, pipeline SCADA RTU replacement, compressor station automation
- Water & Wastewater: Pump station sequencing, SCADA integration, chemical dosing control
- Food & Beverage: Batch processing, CIP (Clean-In-Place) sequencing, packaging line control
- Semiconductor & Electronics: Cleanroom equipment control, wafer handling, test system integration
- Power Generation: Turbine auxiliary control, switchgear automation, substation protection coordination
- Mining & Minerals: Conveyor drive coordination, crusher control, flotation cell management
System Integration & Compatible Parts
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75R (redundant)
- Communication Modules: 1756-EN2T (EtherNet/IP), 1756-CN2R (ControlNet), 1756-DHRIO (DH+/RIO)
- Redundancy Module: 1756-RM2/A
- Energy Storage: 1756-ESMNSE
- Memory Card: 1784-CF128 CompactFlash
- I/O Modules: Full 1756 ControlLogix I/O family (digital, analog, specialty, motion)
- Programming Software: Studio 5000 Logix Designer v21+
Our Quality Assurance Process
Every 1756-L73 unit sourced through Konmask.com undergoes a structured verification process before shipment:
- Visual Inspection: Housing integrity, connector pin condition, label authenticity, and firmware revision label verification
- Functional Power-On Test: Module is seated in a 1756 chassis, powered, and confirmed to reach RUN-mode status
- Firmware Verification: Revision is confirmed and documented; downgrade/upgrade available upon request
- Anti-Static Packaging: Shipped in ESD-safe bags with foam cushioning inside double-wall cartons
- Documentation: Test report and product condition declaration included with every shipment
How to Order
Konmask.com operates as a B2B inquiry-based platform. To request a quote for the 1756-L73:
- Submit your inquiry via the Contact / RFQ form on this page
- Email: support@konmask.com
- WhatsApp / WeChat: +0086 19859288691
Please include: required quantity, preferred firmware revision (if any), delivery timeline, and destination country. We respond to all inquiries within 1 business day.
Why Choose Konmask.com?
- Specialized Inventory: We focus exclusively on industrial automation components — ControlLogix, DCS, drives, and HMI — not a generalist distributor.
- Global Sourcing Network: Access to verified surplus, refurbished, and new-surplus stock from trusted international channels.
- Technical Pre-Sales Support: Our team can advise on firmware compatibility, chassis slot planning, and redundancy configuration before you commit to a purchase.
- Flexible Shipping: DHL, FedEx, and freight options to 80+ countries with full export documentation support.
- Transparent Condition Grading: Every unit is clearly graded (New Surplus / Refurbished / Used-Tested) with no ambiguity.
Frequently Asked Questions
Q: What is the difference between the 1756-L71, L72, L73, and L74?
A: These are the Logix5571, 5572, 5573, and 5574 processors respectively, differentiated primarily by user memory: L71 = 2 MB, L72 = 4 MB, L73 = 8 MB, L74 = 16 MB. All share the same chassis, I/O, and communication module compatibility.
Q: Is the 1756-L73 compatible with older ControlLogix chassis?
A: Yes. The 1756-L73 is physically and electrically compatible with all 1756-series chassis. However, older chassis power supplies should be verified for adequate current capacity when adding modules.
Q: Can the 1756-L73 be used in a redundant configuration?
A: Yes. Paired with the 1756-RM2/A redundancy module and a mirrored chassis, the L73 supports hot-standby redundancy with automatic switchover in under 10 ms.
Q: What firmware version should I specify?
A: This depends on your Studio 5000 Logix Designer version and any Add-On Instructions (AOIs) in your existing program. Please share your current project revision and we will match or advise accordingly.
Q: Do you provide a warranty?
A: Yes. All units carry a minimum 12-month functional warranty. Specific terms are confirmed at the time of quotation based on unit condition grade.
Q: Can you supply multiple units for a plant-wide spare parts program?
A: Absolutely. We regularly fulfill multi-unit orders for MRO spare parts programs. Contact us with your full BOM for a consolidated quote.
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Contact: support@konmask.com | +0086 19859288691
