Overview
The Allen-Bradley 1785-L60B is a PLC-5/60 processor module designed for medium-to-large scale industrial automation applications. This PLC5 controller supports up to 64KWords of controller memory and is capable of handling up to 3072 Input and Output signals or 3072 input and 3072 output in complimentary mode. Built on Rockwell Automation’s proven PLC-5 platform, the 1785-L60B delivers the processing power and I/O density required for complex motion control, discrete manufacturing, and process automation systems.
Key Features
- Four (4) DH+/Remote I/O (Adapter or Scanner) ports, one (1) serial port configurable for RS-232 and 423 and RS-422A compatible, and two (2) programming terminals
- Supports maximum user memory of 64 K words with support for a maximum of 3072 I/O (which can be 3072 inputs, 3072 outputs, or any mix of 3072 I/O)
- Memory expansion options using 1785-ME16 (16KWords), 1785-ME32 (32KWords), or 1785-ME64 (64KWords) cartridges
- Supports up to 24 I/O racks
- Compatible with 1771, 1794 I/O, 1746 I/O, and 1791 Remote I/O devices
Technical Specifications
- Processor Type: PLC5 controller for medium to large scale applications
- Memory: 64 K words maximum user memory (battery-backed SRAM)
- I/O Capacity: 3072 maximum I/O (3072 inputs, 3072 outputs, or any mix of 3072 I/O)
- I/O Racks: Up to 24 I/O racks
- Backplane Current: 3.3 Amperes at 5 Volts (not including memory cartridge)
- Communication Ports: Four DH+/Remote I/O, one RS-232/423/422A serial port, two programming terminals
- Operating Temperature: 0 to 60°C (32 to 140°F) with relative humidity 5–95% non-condensing
- Environmental: Operational shock 30G; vibration 2G at 10–500 Hz
- Weight: Approximately 1.42 kilograms (3 pounds)
- Certifications: UL, C-TICK, CE, and CSA certified
- Product Status: End of Life—Discontinued December 31, 2015
Typical Applications
- Manufacturing automation (assembly lines, packaging, material handling)
- Process control (food and beverage, pharmaceuticals, chemicals)
- Machine control and motion coordination
- Remote I/O and distributed control networks
- Legacy system upgrades and replacements
Compatibility & Replacements
The 1785-L60B is compatible with 1771, 1794 I/O, 1746 I/O, and 1791 Remote I/O devices, enabling integration into existing Allen-Bradley control architectures. This controller supports up to 64KWords memory, compared to the 1785-L80B which supports up to 100KWords, making it ideal for applications that do not require the larger memory footprint of the L80B series. As an end-of-life product, used units remain a cost-effective solution for legacy system maintenance and emergency replacements. This unit has been tested and is in excellent working condition.
