Allen-Bradley 1764-LSP — MicroLogix 1500 Processor Module | Rockwell Automation MicroLogix 1500 Platform
Engineering Background
The Allen-Bradley 1764-LSP is a compact, high-performance processor module designed for the MicroLogix 1500 programmable logic controller platform. Engineered by Rockwell Automation, this module delivers deterministic real-time control for discrete, analog, and specialty I/O applications in demanding industrial environments. The MicroLogix 1500 series has established itself as a benchmark for mid-range automation in manufacturing, process control, and building automation sectors worldwide.
Product Positioning
The 1764-LSP targets automation engineers and OEM system integrators who require a reliable, cost-effective processor with robust communication capabilities and a compact DIN-rail footprint. It bridges the gap between entry-level micro PLCs and full-scale ControlLogix systems, making it the preferred choice for standalone machine control, remote I/O management, and retrofit modernization projects.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1764-LSP |
| Platform | MicroLogix 1500 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Processor Type | Standard Processor (LSP) |
| Program Memory | 6 KB user program / 6 KB data |
| I/O Capacity | Up to 256 I/O points (local + expansion) |
| Communication Ports | RS-232 (Channel 0), DH-485 (Channel 1) |
| Supported Protocols | DF1 Full/Half Duplex, DH-485, Modbus RTU, ASCII |
| Scan Time | 0.9 ms/K (Boolean), 5.9 ms/K (Word) |
| Real-Time Clock | Yes (battery-backed) |
| Battery Backup | Yes — program and data retention |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Power Supply Compatibility | 1764-24BWA, 1764-28BXB (base unit) |
| Mounting | DIN rail or panel mount via base unit |
| Certifications | UL, CE, CSA, C-Tick |
| Weight | Approx. 200 g |
| Programming Software | RSLogix 500 / Studio 5000 Logix Designer (legacy) |
Proven Application Environments
- Discrete Manufacturing: Assembly line sequencing, conveyor control, and machine interlocking in automotive and electronics plants.
- Process Control: Pump station management, valve sequencing, and batch process control in water treatment and chemical facilities.
- Building Automation: HVAC control, lighting management, and access control systems in commercial and industrial buildings.
- OEM Machine Control: Standalone machine controllers for packaging, printing, and material handling equipment.
- Remote I/O Management: Distributed control architectures using DH-485 network for multi-drop panel configurations.
- Retrofit & Modernization: Drop-in replacement for aging SLC 500 and earlier MicroLogix controllers with minimal rewiring.
Engineering Advantages
- Deterministic Scan Performance: Sub-millisecond Boolean scan times ensure precise timing for high-speed discrete control applications.
- Dual-Port Communication: Simultaneous RS-232 and DH-485 connectivity enables HMI integration and network participation without additional hardware.
- Battery-Backed Memory: Program and data retention during power loss eliminates re-initialization downtime and protects critical process parameters.
- Compact Form Factor: Modular base-unit design allows flexible I/O expansion while maintaining a minimal panel footprint.
- Wide Protocol Support: Native Modbus RTU and ASCII support simplifies integration with third-party sensors, drives, and instrumentation.
- Proven Reliability: Designed to IEC 61131-3 standards with full UL/CE/CSA certification for global deployment.
System Architecture & Signal Flow
The 1764-LSP processor module seats directly into a MicroLogix 1500 base unit (1764-24BWA or 1764-28BXB), which provides integrated local I/O and the power supply interface. The processor executes a continuous scan cycle: Input Scan → Program Execution → Output Scan → Housekeeping. Channel 0 (RS-232) handles point-to-point HMI or programming terminal connections via DF1 protocol, while Channel 1 (DH-485) supports multi-drop network topologies with up to 32 nodes. Expansion I/O modules connect via the side-bus connector, extending the system to a maximum of 256 I/O points across multiple expansion racks.
Sourcing & Quality Verification
- Source: Verified surplus and authorized distribution channels — no counterfeit risk.
- Inspection: Each unit undergoes visual inspection, label verification, and functional power-on testing prior to shipment.
- Condition: New surplus or refurbished units clearly labeled; condition disclosed at time of quotation.
- Traceability: Lot documentation and date codes available upon request for quality-critical applications.
- Warranty: 12-month operational warranty against manufacturing defects; return authorization within 30 days for DOA units.
Procurement Process
- Confirm Compatibility: Verify your base unit model (1764-24BWA or 1764-28BXB) and existing I/O configuration before ordering.
- Request a Quote: Contact support@konmask.com for volume pricing, lead time confirmation, and condition disclosure.
- Place Order: Purchase directly via this listing or submit a PO for B2B net-term arrangements.
- Shipping: Orders ship within 1–3 business days; express and freight options available for urgent requirements.
- Documentation: Commercial invoice, packing list, and test report provided with every shipment.
Technical FAQ
Q: Is the 1764-LSP compatible with RSLogix 500?
A: Yes. The 1764-LSP is fully programmed using RSLogix 500 software. Studio 5000 does not support MicroLogix 1500 processors.
Q: Can the 1764-LSP communicate with ControlLogix or CompactLogix systems?
A: Direct EtherNet/IP communication is not supported natively. Integration is possible via a 1761-NET-ENI Ethernet interface module or through a DH-485 to EtherNet/IP gateway.
Q: What is the maximum expansion I/O capacity?
A: The system supports up to 256 total I/O points, combining local base I/O and expansion modules connected via the side-bus.
Q: Does the 1764-LSP support Modbus RTU?
A: Yes. Modbus RTU master and slave functionality is supported on Channel 0 (RS-232) using MSG instructions in RSLogix 500.
Q: How long does the battery maintain memory during power loss?
A: The lithium battery (catalog 1747-BA) provides a minimum of 1 year of memory retention under typical conditions. Battery replacement is recommended every 3–5 years.
Q: Are refurbished units tested before shipment?
A: Yes. All refurbished units undergo power-on functional testing and firmware version verification. Test reports are available upon request.
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