PLC-5 1785-L20E | Allen Bradley Ethernet Programmable Controller

Product Description

The Allen Bradley PLC-5 1785-L20E Processor Module is an Ethernet-enabled programmable logic controller designed for mid-range automation systems. As part of the PLC-5/20E series, it provides reliable control, communication flexibility, and memory backup options. With support for up to 512 I/O points, this processor is suitable for distributed control environments requiring Ethernet connectivity and robust performance.

Technical Specifications

• Model / Part Number 1785-L20E

• Manufacturer Allen Bradley (Rockwell Automation)

• Product Line PLC-5 Series

• Product Type Ethernet Programmable Controller

• Processor PLC-5/20E

• User Memory 16K words (battery-backed static RAM)

• EEPROM Backup Option Supported (1785-ME16, -ME32, -ME64, -M100)

• Protected Memory Not available

• Maximum I/O Capacity

• 512 mixed I/O points

• 512 analog I/O points

• Up to 512 in + 512 out (complementary configuration)

• Weight 4 kg

• Backup Memory Battery-backed RAM with EEPROM option

Application Scenarios

• Ethernet-based distributed control systems

• Mid-range automation requiring reliable memory retention

• Industrial environments needing up to 512 I/O points

FAQ

Q: How much memory does the 1785-L20E provide?  A: It supports 16K words of user memory with battery backup.

Q: Does the controller support EEPROM backup?  A: Yes, using compatible EEPROM modules (1785-ME16, -ME32, -ME64, -M100).

Q: What is the maximum I/O capacity?  A: Up to 512 mixed I/O points or 512 analog I/O points.

Q: Is protected memory available?  A: No, this model does not include protected memory.

Comparison with Similar Models

• 1785-L20E: PLC-5/20E processor, 16K memory, Ethernet-enabled

• 1785-L30E: PLC-5/30E processor, larger memory capacity, extended I/O support

• 1785-L40E: PLC-5/40E processor, higher performance with expanded communication