1785-L20E

Overview of Allen-Bradley 1785-L20E Ethernet PLC-5 Programmable Controller

The Allen-Bradley 1785-L20E is an Ethernet-enabled PLC-5/20 programmable controller designed for industrial automation applications. It features 16,000 words of user memory and supports up to 512 total I/O channels in any mix or 512 inputs and 512 outputs in complementary mode. The controller provides multiple communication options including Ethernet, Data Highway Plus (DH+), Remote I/O, and configurable serial ports.

Key Features

• 16,000 words of user memory with support for extensive program and data storage
• Supports up to 512 total I/O points (any mix) or 512 inputs plus 512 outputs (complementary)
• Communication ports:
  • 1 Ethernet port (10 Mbps, 802.3 compliant)
  • 1 DH+ port
  • 1 DH+/Remote I/O port (adapter or scanner)
  • 1 serial port configurable for RS-232, RS-422A, or RS-423
• Maximum number of I/O chassis supported: 13
• Power dissipation: 19 W maximum
• Backplane current: 3.6 A at 5 V DC maximum
• Operating temperature range: 0 to 60 °C (32 to 140 °F)
• Battery type 1770-XYC containing 0.65 g lithium for memory backup
• Supports multiple programming protocols including DF1 full and half-duplex, and ASCII
• Complies with industrial electromagnetic compatibility standards

Technical Specifications

Applications

The 1785-L20E PLC-5 controller is used in a wide array of industrial environments requiring Ethernet-enabled communication and reliable programmable logic control for moderate-sized installations. It supports automation in manufacturing, process control, and systems integration.