Overview
The Allen-Bradley 1785-L60B is a proven PLC-5/60 processor module from Rockwell Automation, designed for medium to large-scale industrial automation and control systems. This used unit provides 64K words of battery-backed SRAM memory and supports up to 3072 I/O points, making it suitable for complex manufacturing, process control, and machine automation environments. The processor includes four DH+/Remote I/O communication channels and one RS-232 serial port for flexible network integration.
Key Features
- 64K Word User Memory – Battery-backed static RAM (SRAM) for reliable program and data storage
- 3072 Maximum I/O Capacity – Supports any mix of 3072 discrete inputs, outputs, or analog I/O
- Four DH+/Remote I/O Channels – Enables multi-point distributed control across up to 92+ remote I/O chassis plus local I/O
- RS-232/423/422A Serial Port – 25-pin D-shell connector supporting ASCII and DF1 half/full-duplex communication
- Three I/O Addressing Modes – 2-slot, 1-slot, and half-slot modes for flexible module configuration
- Status LED Indicators – BATT, RUN/FAULT, FORCE, and COMM indicators for real-time system monitoring
Technical Specifications
The 1785-L60B delivers robust performance across demanding industrial environments with the following specifications:
Typical Applications
- Manufacturing Automation – Assembly lines, packaging, material handling, and conveyor systems
- Process Control – Food and beverage, pharmaceuticals, chemicals, and oil & gas operations
- Machine Control – Multi-axis motion control and equipment monitoring
- Distributed Control Networks – Remote I/O, DH+ networking, and centralized monitoring via HMI integration
- Legacy System Upgrades – Drop-in replacement for existing PLC-5 installations
Compatibility & Replacements
Compatible With
- Allen-Bradley PLC-5 I/O Chassis (Series A, B, C, D)
- 1785-series memory expansion modules (1785-ME16, 1785-ME32, 1785-ME64)
- DH+ network devices and scanners
- Remote I/O (RIO) adapters and modules
- Allen-Bradley programming terminals and HMI systems
- RS-232/RS-422/RS-423 serial devices
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1785-L60B is directly compatible with other Series C and Series E 1785-L60B units and serves as a high-capacity alternative to the lower-memory 1785-L40B and 1785-L20B processors in PLC-5 systems. This used unit carries Series C revision as indicated in the product title.
Works With
- RSLogix 5 – Legacy PLC-5 programming software (end-of-life)
- DH+ Protocol – Data Highway Plus networking
- Remote I/O (RIO) – Distributed remote adapter communication
- DF1 Protocol – Serial ASCII and binary communication modes
- Allen-Bradley HMI Systems – PanelView and legacy FactoryTalk View integration
- ControlLogix Integration – Bridging to modern Rockwell systems via gateway modules
