Allen-Bradley 1785-L80C15 – PLC-5/80 ControlNet Processor Module | PLC-5 Series Platform
Engineering Background
The Allen-Bradley PLC-5 series represents Rockwell Automation’s flagship mid-to-large scale programmable controller platform, engineered for high-throughput discrete and process control applications. Introduced and refined over decades of industrial deployment, the PLC-5 architecture remains deeply embedded in legacy manufacturing infrastructure across automotive, oil & gas, mining, pulp & paper, and utilities sectors worldwide.
Product Positioning
The 1785-L80C15 is the highest-memory variant in the PLC-5/80 ControlNet processor family, offering 100K words of user memory combined with an integrated ControlNet communication port. It is the preferred choice for engineers managing large I/O counts, complex ladder logic programs, and deterministic peer-to-peer data exchange across ControlNet networks — all within a single processor module. Konmask.com supplies this module from verified surplus and refurbished channels, providing procurement engineers with a reliable, cost-effective alternative to new OEM pricing.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1785-L80C15 |
| Series / Revision | PLC-5/80 — Series C (verify label on unit) |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| User Memory | 100K Words (100,000 words) |
| I/O Capacity | Up to 3,072 I/O points (local + remote) |
| Communication Port 1 | ControlNet (BNC coaxial, integrated) |
| Communication Port 2 | RS-232 / DH+ (Channel 0) |
| Communication Port 3 | DH+ / Remote I/O (Channel 1A) |
| ControlNet Data Rate | 5 Mbps |
| Scan Time | Application-dependent; typically 1–10 ms for standard programs |
| Power Supply Requirement | Supplied by PLC-5 chassis backplane (1771 series) |
| Chassis Compatibility | 1771 I/O chassis (all slot widths) |
| Programming Software | RSLogix 5 (v7.x and above recommended) |
| 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 |
| Dimensions (H × W × D) | Approx. 290 × 95 × 145 mm (standard PLC-5 form factor) |
| Weight | Approx. 1,450 g |
| Agency Certifications | UL, CSA, CE (verify series label) |
| Firmware | Upgradeable via RSLogix 5 / ControlFLASH |
Proven Application Environments
- Automotive Manufacturing: Body-in-white assembly lines, paint shop conveyors, and press transfer systems requiring deterministic ControlNet scheduling.
- Oil & Gas: Pipeline SCADA integration, compressor station control, and wellhead automation with large I/O point counts.
- Mining & Minerals: Conveyor drive coordination, crusher control, and plant-wide DCS integration via ControlNet backplane.
- Pulp & Paper: Continuous process control with high-speed data exchange between multiple PLC-5 nodes on a shared ControlNet trunk.
- Utilities & Water Treatment: Pump station control, SCADA-linked remote I/O, and legacy system life-extension projects.
- Food & Beverage: Batch processing, CIP (Clean-In-Place) sequencing, and packaging line synchronization.
Engineering Advantages
- Maximum Memory Headroom: 100K words eliminates program memory constraints for complex ladder logic, function block, and structured text routines.
- Integrated ControlNet Port: Eliminates the need for a separate 1784-KTCX15 or 1771-ACN15 scanner card, reducing chassis slot consumption and wiring complexity.
- Deterministic Peer-to-Peer Messaging: ControlNet’s scheduled bandwidth guarantees cycle-accurate data exchange between processors — critical for coordinated multi-axis or multi-zone control.
- Dual DH+ / Remote I/O Channels: Supports simultaneous HMI communication (PanelView, FactoryTalk) and remote I/O rack expansion without additional communication modules.
- Drop-In Replacement: Pin-compatible with 1785-L80B and 1785-L80E in the same chassis slot; firmware migration path is well-documented in Rockwell publication 1785-UM012.
- Long Service Life: PLC-5 platform components remain in active industrial use; Rockwell extended support timelines confirm continued availability of firmware and documentation.
System Architecture & Signal Flow
The 1785-L80C15 occupies Slot 0 of a 1771 I/O chassis. The processor communicates with local I/O modules via the 1771 backplane at the chassis scan rate. Remote I/O racks are addressed via Channel 1A (RIO) at up to 57.6 Kbps (quarter-rack) or 115.2 Kbps (full-rack). ControlNet peer messaging is handled through the integrated BNC port, supporting both scheduled (cyclic) and unscheduled (messaging) connections simultaneously. Programming and monitoring are performed via Channel 0 (RS-232 or DH+) using RSLogix 5 on a Windows-based engineering workstation. A typical architecture includes:
- 1785-L80C15 in Slot 0 → 1771 local I/O modules (Slots 1–n)
- Channel 1A → 1771-ASB remote I/O adapter → remote 1771 racks
- ControlNet port → ControlNet trunk cable → peer PLC-5 processors, 1756-CNB bridge modules, or SCADA OPC servers
- Channel 0 → RS-232 → programming terminal (RSLogix 5)
Sourcing & Quality Verification
All 1785-L80C15 units supplied by Konmask.com undergo the following verification process before dispatch:
- Visual Inspection: Enclosure integrity, connector condition, label legibility, and series/revision confirmation.
- Functional Power-On Test: Module is powered in a compatible 1771 chassis; processor fault codes and memory integrity are verified.
- Firmware Version Check: Current firmware revision is documented and provided to the buyer upon request.
- ESD-Safe Packaging: Units are shipped in anti-static bags with foam cushioning inside double-wall corrugated cartons.
- Traceability Documentation: Serial number, test date, and inspector ID are recorded for each unit.
Units are sourced from decommissioned OEM production lines, authorized surplus dealers, and controlled refurbishment partners. Konmask does not supply counterfeit or grey-market components.
Procurement Process
- Confirm Part Number & Revision: Verify your existing system requires 1785-L80C15 (not L80B or L80E). Check the chassis slot label and RSLogix 5 project hardware configuration.
- Request a Quote: Contact support@konmask.com with your required quantity, delivery timeline, and any firmware version requirements.
- Review Test Report: Konmask provides a pre-shipment test report upon request. Review firmware revision and functional test results before confirming the order.
- Place Order: Orders can be placed via this product page or by email PO. Payment terms available for qualified accounts.
- Shipping & Lead Time: In-stock units ship within 1–3 business days. International shipments include commercial invoice and HS code documentation (HS: 8537.10).
- Incoming Inspection: Upon receipt, verify the serial number against the provided test report. Contact Konmask within 5 business days if any discrepancy is found.
Technical FAQ
Q: Is the 1785-L80C15 compatible with RSLogix 5000?
A: No. The PLC-5 platform is programmed exclusively with RSLogix 5. RSLogix 5000 / Studio 5000 is for the ControlLogix (1756) platform. Migration tools (RSLogix 5 to Studio 5000) are available from Rockwell if a platform upgrade is planned.
Q: Can I replace a 1785-L80B with a 1785-L80C15 without hardware changes?
A: Yes, in most cases. Both modules occupy the same chassis slot and use the same 1771 backplane. The C15 adds an integrated ControlNet port not present on the L80B. Verify firmware compatibility with your existing RSLogix 5 project before swapping.
Q: What ControlNet media is required?
A: Standard RG-6 coaxial cable with BNC connectors. ControlNet taps (1786-TPS or 1786-TPR) are required for multi-drop trunk configurations. Maximum trunk length is 1,000 m (without repeaters).
Q: Does Konmask provide a warranty?
A: Yes. Konmask offers a 90-day functional warranty on all tested surplus modules. Extended warranty options are available — contact support@konmask.com for details.
Q: Can Konmask assist with firmware upgrades or RSLogix 5 configuration?
A: Our technical team can advise on firmware compatibility and upgrade procedures. On-site commissioning support is available by arrangement.
Q: What is the lead time for out-of-stock units?
A: Typical sourcing lead time for out-of-stock PLC-5 modules is 2–6 weeks depending on market availability. Contact us to be added to the back-order notification list.
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