The Allen-Bradley 1785-L20E serves as a central processing unit for the classic PLC-5 automation platform. This module combines standard logic execution with a built-in Ethernet interface. It fits into a single slot of a 1771 I/O chassis. Furthermore, the processor manages complex automation tasks for medium-scale industrial applications. This controller specifically supports advanced communication without requiring extra network bridge modules.
Consequently, users can connect the 1785-L20E directly to office or plant-wide Ethernet networks. This integration facilitates faster data collection and remote programming capabilities. The unit remains a reliable choice for maintaining existing 1771 infrastructure while improving connectivity.
Technical Performance and Memory Specifications
- Manufacturer: Allen-Bradley / Rockwell Automation
- Model Number: 1785-L20E
- Product Line: PLC-5 Enhanced Ethernet
- Memory Capacity: 16K words of SRAM
- Battery Type: 1770-XYC Lithium (Standard)
- Backplane Current: 3.3 Amps at 5V DC
- Max Mixed I/O: 512 total points
- Chassis Compatibility: 1771-A1B through 1771-A4B
- Physical Mass: 1.18 kg
- Module Dimensions: 4.8 x 15 x 27.3 cm
- Manufacturing Origin: USA
Extensive Network and I/O Scalability
The 1785-L20E features a diverse set of communication ports for maximum flexibility. It includes an onboard 10/100 Mbps Ethernet port for high-speed messaging. Additionally, the front panel provides a Data Highway Plus (DH+) port and a serial interface. This serial port supports RS-232C, RS-422A, and RS-423 standards.
Moreover, the processor controls up to twelve remote I/O racks alongside one local chassis. It utilizes a fast I/O scan time of 3 milliseconds at 230.4 kbps. These speeds ensure the controller responds rapidly to field sensor changes. Therefore, the system maintains high precision during high-speed production cycles.
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