Allen-Bradley 1785-L20E Overview The Allen-Bradley 1785-L20E is a PLC-5/20E programmable logic controller with integrated Ethernet communication and 32K words of user memory. As a member of the PLC-5/20E family, this Series E processor supports Remote I/O Master functionality and is ideal for mid-sized automation applications requiring fast data handling and reliable network integration. Key Features Controller Type: PLC-5/20E User Memory: 32K words Communication Ports: Ethernet (10Base-T) RS-232 Remote I/O Master Capability Programming Software: RSLogix 5 Mounting: Chassis-based (1771 platform) Status Indicators: LED diagnostics on front panel Series: E Technical Specifications Catalog Number: 1785-L20E User Memory: 32K words Communication: Ethernet (10Base-T), RS-232 Remote I/O Support: Yes (Master only) Instruction Execution Speed: 2–3 µs per instruction I/O Capacity: Up to 512 local I/O points Power Requirements: Supplied from 1771 chassis Operating Temp: 0°C to 60°C Certifications: UL, CSA, CE Chassis Compatibility: Allen-Bradley 1771 chassis Applications Legacy PLC-5 systems in process and discrete industries Plant-wide control systems using Ethernet networking OEM equipment using 1771 I/O platforms Mid-sized automation systems requiring reliable PLC control Industrial applications needing remote I/O capabilities Why Choose the 1785-L20E Integrated Ethernet: Simplifies plant network integration Proven PLC-5 Platform: Reliable and field-tested system Remote I/O Master: Centralized control of distributed I/O Ample Memory: 32K words for moderate complexity applications Seamless Upgrades: Compatible with existing 1771 hardware Order Now The Allen-Bradley 1785-L20E PLC-5/20E processor is available and ships worldwide.
