Legacy PLC Retrofit & Process Control Solution – Allen-Bradley 1785-L30B | PLC-5 Series
Where This Product Is Used
The Allen-Bradley 1785-L30B is a mid-range processor from Rockwell Automation’s PLC-5 family, widely deployed across heavy industry and critical infrastructure. Engineers specify this controller in environments where proven reliability and long service life outweigh the need for cutting-edge architecture.
- Oil & Gas: Pipeline SCADA systems, compressor station control, wellhead automation
- Automotive Manufacturing: Transfer line sequencing, body-in-white welding cells, paint shop conveyors
- Water & Wastewater: Pump station control, filtration process management, lift station automation
- Pulp & Paper: Digester control, winder/unwinder sequencing, chemical dosing systems
- Power Generation: Auxiliary equipment control, turbine governor backup, switchgear interlocking
- Food & Beverage: Batch processing, CIP (Clean-in-Place) control, packaging line coordination
- Mining: Conveyor drive control, crusher sequencing, ventilation management
- Legacy System Maintenance: Direct drop-in replacement for existing 1785-L30B installations requiring zero re-programming
Technical Specifications
| Part Number | 1785-L30B |
| Series | PLC-5 (Series B) |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Processor Type | Enhanced PLC-5 Processor |
| Memory | 32K Words (Data + Program) |
| Max I/O Points | 3,072 (local + remote) |
| Communication Ports | DH+ (Data Highway Plus), RS-232 (Channel 0) |
| Remote I/O | Supported via 1771 I/O chassis |
| Programming Software | RSLogix 5 (6200 Series compatible) |
| Backplane | 1771 Universal Backplane compatible |
| Power Supply | 1771-P4S / 1771-P7 (sold separately) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5% to 95% non-condensing |
| Weight | 320 g (approx.) |
| Certifications | UL, CE, CSA |
Why Engineers Specify This Model
- Zero Reprogramming Cost: Direct hardware replacement for any existing 1785-L30B installation — existing ladder logic, data tables, and I/O configurations transfer without modification.
- Proven 30+ Year Track Record: The PLC-5 platform has accumulated billions of operating hours across global industrial installations, with documented MTBF exceeding 100,000 hours in controlled environments.
- DH+ Network Compatibility: Maintains full interoperability with existing DH+ networks, HMI panels (PanelView 550/900/1000), and SCADA systems without gateway hardware.
- 1771 Backplane Ecosystem: Leverages the extensive 1771 I/O module library — analog, digital, thermocouple, high-speed counter — eliminating the need to replace field wiring or I/O hardware.
- Deferred Migration Strategy: Allows facilities to maintain production continuity while planning a phased migration to ControlLogix or CompactLogix platforms on their own schedule.
- Spare Parts Availability: Konmask.com maintains verified stock of 1785-L30B units, enabling rapid deployment for unplanned downtime events.
Complete System Bill of Materials
A fully operational PLC-5/30 system based on the 1785-L30B typically requires the following components:
- 1785-L30B — PLC-5/30 Enhanced Processor (this item)
- 1771-A4B / 1771-A2B — I/O Chassis (4-slot or 8-slot)
- 1771-P4S / 1771-P7 — Power Supply Module
- 1771-OBD / 1771-IBD — Digital Output / Input Modules
- 1771-OFE / 1771-IFE — Analog Output / Input Modules (if required)
- 1784-KTX / 1784-PKTX — DH+ Communication Card (for programming PC)
- RSLogix 5 — Programming Software License (Rockwell Automation)
- 1761-CBL-PM02 — RS-232 Programming Cable
Contact support@konmask.com to source complete system packages or individual BOM components.
Compliance & Industry Standards
- UL Listed: UL 508 (Industrial Control Equipment)
- CE Marked: Compliant with EU Low Voltage Directive and EMC Directive
- CSA Certified: Canadian Standards Association approval for industrial use
- RoHS: Verify unit revision for RoHS compliance status (contact us for documentation)
- IEC 61131-3: Ladder Diagram (LD) programming language support
- NEMA / IEC: Suitable for installation in NEMA 12 / IP54 enclosures and above
Quality Assurance & Sourcing
Every 1785-L30B unit offered through Konmask.com undergoes a structured verification process before dispatch:
- Visual Inspection: Board-level inspection for corrosion, damaged components, and counterfeit indicators
- Functional Power-On Test: Unit is powered and processor status LEDs verified (RUN, BATT, FAULT)
- Firmware Revision Check: Series and firmware revision documented and disclosed prior to shipment
- Battery Status: Lithium backup battery tested; replacement offered if below threshold
- Packaging: Anti-static bag + foam-lined carton; humidity indicator card included for international shipments
- Traceability: Serial number and revision recorded against each order for full audit trail
We source from decommissioned OEM lines, authorized distributors, and verified industrial surplus channels. Counterfeit-risk screening is applied to all units from non-OEM sources.
How to Source This Part
- Add to Cart — Click “Buy Now” or “Add to Cart” above. Stock is limited; availability is real-time.
- Request a Quote — For quantities of 2 or more, email support@konmask.com with your required quantity, delivery timeline, and destination country for a volume price.
- Emergency / AOG Orders — Call or WhatsApp +0086 19859288691 for same-day response on critical downtime situations.
- System Package Orders — Provide your existing system configuration and we will quote a complete matched BOM.
- International Shipping — We ship globally via DHL Express, FedEx International Priority, and UPS Worldwide. Export documentation (commercial invoice, packing list, HS code 8537.10) provided as standard.
Application-Specific FAQ
Q: Is the 1785-L30B a direct replacement for the 1785-L30A?
A: Yes, the L30B is the Series B revision of the L30A. It is backward-compatible and will operate in the same chassis slot with the same I/O configuration. No program changes are required.
Q: Can I use RSLogix 5000 to program this controller?
A: No. The PLC-5 platform requires RSLogix 5 (or the legacy 6200 Series software). RSLogix 5000 / Studio 5000 is exclusively for Logix5000-family controllers (ControlLogix, CompactLogix, etc.).
Q: What is the maximum program size for the 1785-L30B?
A: The 1785-L30B provides 32K words of combined data and program memory. For most legacy applications this is sufficient; however, if your program is approaching this limit, consider a 1785-L60B (64K words) as an alternative.
Q: Does this unit support Ethernet/IP?
A: Not natively. The 1785-L30B communicates via DH+ and RS-232. Ethernet/IP connectivity can be added using a 1761-NET-ENI or 1784-PKTXD gateway module.
Q: What is the expected lead time?
A: In-stock units ship within 1–2 business days. For out-of-stock inquiries, typical sourcing lead time is 5–15 business days depending on origin. Contact us for current availability.
Q: Do you provide a warranty?
A: Yes. All units carry a 90-day functional warranty covering processor failure under normal operating conditions. Extended warranty options are available on request.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
