PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1785-L80C15 is a PLC-5 processor designed for legacy industrial control architectures. This unit manages up to 3072 input and output devices across standard or complementary configurations. It features 100 Kilowords of user memory and supports battery-backed static RAM operation. Program scan execution runs at 0.5 milliseconds per Kword for bit logic.
The module provides dual ControlNet communication ports operating at five megabits per second over coaxial media. Additional onboard interfaces include one serial port, Data Highway Plus, and Remote I/O connections. An integrated RJ45 network access port supports local ControlNet commissioning. The controller installs directly into the leftmost slot of compatible 1771 I/O chassis.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| UPC | 612598180394 |
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| Weight | 3.63 lbs (1.64 kg) |
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| Max Total I/O | 3072 (any mix); 3072 Input / 3072 output (complimentary) |
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| Module Type | Processor |
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| Communication Ports | Data Highway Plus (DH+); Remote I/O (RIO); Serial; DH using 1785-KA; Two (2) ControlNet |
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| Controller Memory | up to 100 Kwords |
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| Hardware Addressing | 2-slot; 1-slot; 1/2-slot |
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| Program Scan time | 0.5 ms per K word (bit logic) 2 ms per K word (typical) |
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| Module Location | 1771-A1B, -A2B, A3B, -A3B1, -A4B chassis; left-most slot |
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| I/O system | Bulletin 1771 I/O, 1794 I/O, 1746 I/O, and 1791 I/O including 8-, 16-, 32-pt, and intelligent modules |
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| Battery | Allen Bradley 1770-XYC |
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| Memory Modulues | 1785-ME32, 1785-ME64, 1785-M100 |
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| Controller Redundancy | Supported |
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| Processor | PLC-5/80C |
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| Max User Memory Words | 100 Kilowords |
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| Battery-Backed Static RAM | Yes |
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| EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) | Yes |
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| Protected Memory | No |
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| Max Analog I/O | Forcible 3072 and Nonforcible 50176 |
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| I/O Scan Time Per Rack | ControlNet I/O 0.5 ms (average); Universal Remote I/O 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s |
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| Max I/O Chassis Total | 125 |
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| Max I/O Chassis Extended Local | 0 |
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| Max I/O Chassis Universal Remote | 60 |
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| RS-232-C/422-A/423- A Ports | 1 |
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| Control Coprocessor Expansion Port | Yes |
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TECHNICAL INFORMATION
Features
- Supports up to 100 Kilowords of battery-backed user memory.
- Handles up to 3072 total I/O devices in complementary addressing mode.
- Provides dual redundant ControlNet BNC communication ports running at 5 Mbps.
- Features an optically-coupled Channel 0 serial port supporting RS-232-C, RS-422-A, and RS-423-A.
- Supports 2-slot, 1-slot, and 1/2-slot hardware addressing modes.
- Includes status indicators for ControlNet, processor run, channel activity, and battery health.
TECHNICAL INFORMATION
Applications
- Large-scale manufacturing lines running legacy Bulletin 1771 I/O infrastructure.
- Distributed plant automation networks coordinated over ControlNet, DH+, and Remote I/O.
- Process systems requiring redundant media connectivity and high-speed data transmission.
TECHNICAL INFORMATION
Connections / Interfaces
- Two ControlNet BNC coaxial connectors supporting redundant transmission media.
- One RJ45 ControlNet Network Access Port for diagnostics and configuration access.
- One serial port supporting RS-232-C, RS-422-A, and RS-423-A communication standards.
- Dedicated communication terminals for Data Highway Plus and Remote I/O networks.
TECHNICAL INFORMATION
Installation Guidelines
- Install the processor strictly in the leftmost slot of a compatible 1771 chassis.
- Set backplane keying bands between pins 40 and 42, and pins 54 and 56.
- Maintain ambient operating temperatures between 0 and 60 degrees Celsius.
- Ensure non-condensing relative humidity stays between 5 and 95 percent.
TECHNICAL INFORMATION
Configuration Guidelines
- Select 2-slot, 1-slot, or 1/2-slot addressing to match rack module density.
- Configure 32-point modules in pairs when using 1-slot addressing mode.
- Configure DH+ and Remote I/O baud rates at 57.6, 115.2, or 230.4 kbits/s.
- Install an optional EEPROM module such as the 1785-M100 for non-volatile memory backup.
TECHNICAL INFORMATION
Compatibility
- Mounts in 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B chassis.
- Interfaces with Bulletin 1771, 1794, 1746, and 1791 I/O systems.
- Uses Allen-Bradley 1770-XYC replaceable battery units.
- Accepts 1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100 backup modules.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1785-L80C15 is part of the mature Allen-Bradley PLC-5 product line.
- Routine maintenance requires periodic testing and replacement of the 1770-XYC lithium battery.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSMounts in 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B chassis. Interfaces with Bulletin 1771, 1794, 1746, and 1791 I/O systems. Uses Allen-Bradley 1770-XYC replaceable battery units. Accepts 1785-ME16, 1785-ME32, 1785-ME64, and 1785-M100 backup modules.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What chassis types accept the Allen-Bradley 1785-L80C15 processor?
The module mounts into 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B chassis in the leftmost slot.
What is the memory capacity of the 1785-L80C15 processor?
The controller contains 100 Kilowords of user memory and supports optional EEPROM backup modules.
Which communication protocols are integrated into the 1785-L80C15?
It provides ControlNet, Data Highway Plus, Universal Remote I/O, and serial RS-232-C, RS-422-A, and RS-423-A ports.
What battery replacement does the 1785-L80C15 use?
The unit uses an Allen-Bradley 1770-XYC battery to preserve static RAM during power loss.
