Allen-Bradley 1747-L30C Processor Unit – Series C | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1747-L30C is a SLC 5/03 CPU processor module from Rockwell Automation’s SLC 500 fixed/modular controller family. This Series C unit features an integrated DH-485 communication port and supports up to 4K words of user program memory, making it a reliable choice for mid-range discrete and process control applications. This page provides a comprehensive selection guide, compatible replacement models, and sourcing information for engineers and procurement teams.
Technical Specifications
- Part Number: 1747-L30C
- Series: C
- Processor Family: SLC 5/03
- User Memory: 4K words (program + data)
- Communication Ports: DH-485 (RS-485), RS-232 (Channel 0)
- I/O Capacity: Up to 4096 I/O points (with expansion chassis)
- Scan Time: ~1 ms/K (typical)
- Power Supply: Supplied via SLC 500 chassis backplane
- 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)
- Certifications: UL, CSA, CE, C-Tick
- Weight: Approx. 1.8 kg
- Firmware: Series C (latest revision for SLC 5/03)
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or direct drop-in replacements for the 1747-L30C. Always verify firmware revision and chassis compatibility before substitution.
- 1747-L30B – SLC 5/03, Series B; same memory and I/O, earlier firmware revision
- 1747-L30A – SLC 5/03, Series A; compatible but lacks some Series C enhancements
- 1747-L531 – SLC 5/03, 8K memory upgrade path; pin-compatible, expanded capacity
- 1747-L532 – SLC 5/03, 16K memory; suitable for larger programs requiring migration
- 1747-L533 – SLC 5/03, 32K memory; highest capacity SLC 5/03 variant
- 1747-L40C / 1747-L40E – SLC 5/04 series; DH+ communication, higher throughput
- 1747-L551 / 1747-L553 – SLC 5/05 series; adds Ethernet/IP port for modern network integration
Note: Cross-series replacements (5/03 → 5/04 or 5/05) may require program re-compilation and I/O mapping review.
Why Choose the Original 1747-L30C
- Proven Reliability: Decades of field-proven performance in industrial environments
- Series C Enhancements: Improved noise immunity and firmware stability over earlier series
- DH-485 Native Support: Seamless integration with existing DH-485 networks without additional hardware
- Drop-In Compatibility: Direct replacement in any SLC 500 modular or fixed chassis without rewiring
- Broad Software Support: Fully supported by RSLogix 500 and Studio 5000 Logix Designer (offline)
- Cost-Effective MRO: Lower acquisition cost vs. migrating to ControlLogix for legacy line maintenance
Typical Applications
- Discrete manufacturing: assembly lines, conveyor control, packaging machinery
- Process control: batch mixing, temperature regulation, flow control loops
- Building automation: HVAC sequencing, pump control, lighting systems
- Water & wastewater: pump station control, level monitoring
- Food & beverage: filling lines, pasteurization, CIP systems
- MRO / spare parts: direct replacement for aging SLC 500 installations
System Compatibility
- Chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13 (all SLC 500 modular chassis)
- Power Supplies: 1746-P1, 1746-P2, 1746-P3, 1746-P4, 1746-P7
- I/O Modules: All 1746-series digital and analog I/O modules
- Programming Software: RSLogix 500 v8.x and above; APS (legacy)
- Communication: DH-485 network (up to 32 nodes); RS-232 for programming and HMI
- HMI Compatibility: PanelView 300, 550, 600, 900, 1000 series via DH-485 or DF1
Selection Guide
Use the table below to select the right SLC 5/03 or upgrade path based on your application requirements:
| Model | Memory | Communication | Best For |
|---|---|---|---|
| 1747-L30C (this unit) | 4K words | DH-485, RS-232 | Standard MRO replacement, small-to-mid programs |
| 1747-L531 | 8K words | DH-485, RS-232 | Expanded program capacity, same network |
| 1747-L532 | 16K words | DH-485, RS-232 | Complex logic, large data tables |
| 1747-L533 | 32K words | DH-485, RS-232 | Maximum SLC 5/03 capacity |
| 1747-L40C | 16K words | DH+, RS-232 | DH+ network migration |
| 1747-L551 | 16K words | Ethernet/IP, RS-232 | Modern network integration |
Quality Assurance & Sourcing
- Condition: New surplus, refurbished (tested), or factory-new options available — specify at inquiry
- Testing: All refurbished units undergo power-on functional testing and communication port verification
- Traceability: Original manufacturer labels retained; date codes available on request
- Warranty: 12-month warranty on all units supplied by Konmask.com
- Packaging: Anti-static ESD packaging; double-boxed for international shipment
- Lead Time: In-stock units ship within 1–3 business days; sourced units 5–15 business days
How to Order
- Confirm your chassis model and current processor series (check label on existing unit)
- Verify RSLogix 500 program backup is available before replacement
- Select condition: New Surplus / Refurbished / Factory New
- Submit your inquiry via support@konmask.com or add to cart directly
- Provide PO number, shipping address, and any special requirements (e.g., expedited, export documentation)
For bulk orders (>5 units) or project-based procurement, contact us for volume pricing and lead time confirmation.
Replacement & Compatibility FAQ
Q: Can I replace a 1747-L30B with a 1747-L30C directly?
A: Yes. The Series C is a direct drop-in replacement for Series A and B. No wiring or chassis changes required. Restore your RSLogix 500 program backup after installation.
Q: Is the 1747-L30C compatible with all SLC 500 chassis?
A: Yes, it is compatible with all 1746-series modular chassis (A4, A7, A10, A13) and all 1746-series power supplies.
Q: Can I upgrade from 1747-L30C to SLC 5/05 (Ethernet)?
A: Yes, the 1747-L551 or 1747-L553 are drop-in upgrades. Your existing RSLogix 500 program is fully compatible — no recompilation needed for the same chassis.
Q: Does the 1747-L30C support ControlNet or Ethernet/IP?
A: No. The SLC 5/03 supports DH-485 and RS-232 only. For Ethernet/IP, select the SLC 5/05 (1747-L55x series).
Q: What programming software is required?
A: RSLogix 500 (any version from v5.x onward). APS (legacy DOS-based software) is also compatible for older installations.
Q: Can Konmask.com provide export documentation for international orders?
A: Yes. We provide commercial invoices, packing lists, COO certificates, and ECCN classification documentation upon request.
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