Product Overview
The Allen-Bradley 1785-L80C15 is a ControlNet PLC-5/80C Programmable Logic Controller (PLC) from the legacy PLC-5 platform. Designed for large and complex applications, this processor handles up to 3072 input and output devices in any mix, or 3072 inputs and 3072 outputs in complimentary mode. Its robust communication suite includes serial (DF1), Data Highway Plus (DH+), Remote I/O (RIO), DH using 1785-KA, and two ControlNet ports, enabling high-speed networked topologies.
Technical Specifications Breakdown
Key parameters for the 1785-L80C15 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1785-L80C15 |
| Module Type | Processor |
| Max Total I/O | 3072 (any mix); 3072 Input / 3072 output (complimentary) |
| Controller Memory | up to 100 Kwords |
| Communication Ports | Data Highway Plus (DH+); Remote I/O (RIO); Serial; DH using 1785-KA; Two (2) ControlNet |
| Program Scan Time | 0.5 ms per K word (bit logic) 2 ms per K word (typical) |
| Battery | Allen-Bradley 1770-XYC |
| Operating Temperature | 0-60 deg. Celsius (32-140 deg. Fahrenheit) |
| Weight | 3 lbs, 2 oz (1.42 kg) |
Industry Applications
For example, in automotive assembly, the 1785-L80C15 coordinates multiple robotic stations via ControlNet, ensuring synchronized motion and data exchange. In material handling, its DH+ and RIO ports connect remote I/O racks over long distances, reducing wiring costs.
Installation & Setup Guidance
Mount the 1785-L80C15 in the left-most slot of a compatible 1771 chassis (models A1B, A2B, A3B, A3B1, or A4B). Ensure keying bands are set between positions 40 and 42, and 54 and 56. For addressing, select 2-slot, 1-slot, or 1/2-slot mode based on I/O module density. Use RG6 coax cable for ControlNet connections and configure network parameters via the serial port or ControlNet interface. Always install the 1770-XYC battery before power-up to retain program memory.
Maintenance & Reliability
Periodically inspect the battery status indicator (red LED) and replace the 1770-XYC battery every 2-3 years or as indicated. Keep the chassis environment within 0-60°C and 5-95% non-condensing humidity to ensure reliable operation. The module's ESD immunity of 4 kV contact discharges reduces risk during handling. For long-term storage, maintain temperatures between -40-85°C.
Compatibility & Integration
The 1785-L80C15 integrates with Bulletin 1771, 1794, 1746, and 1791 I/O systems, including 8-, 16-, and 32-point modules and intelligent modules. It supports controller redundancy for high-availability systems. Memory modules (1785-ME32, -ME64, -M100) enable EEPROM program backup. The ControlNet port operates at 5 Mbps, while DH+ and RIO support 57.6, 115.2, and 230.4 kbps.
Selection Guide & Purchasing Advice
When selecting a replacement or upgrade, verify your existing I/O count and communication requirements. The 1785-L80C15 is a legacy product; please verify current lifecycle status and availability with AutoDCSTech before ordering. AutoDCSTech offers tested units with fast shipping to minimize downtime.
Troubleshooting & Common Issues
If the processor fails to communicate, check the Channel 0 ACTIVE/FAULT indicator. A steady red indicates a serial port fault; verify cable connections and DF1 settings. If the battery LED is red, replace the 1770-XYC battery immediately to avoid losing the program. For ControlNet issues, inspect the BNC connectors and cable integrity. If the RUN/FAULT LED shows red, cycle power and monitor the status.
Availability & Condition at AutoDCSTech
| Part Number | 1785-L80C15 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
