AB 1785-L20B processor module

Product Overview

The Allen-Bradley 1785-L20B is a PLC-5/20 processor module. It was a popular choice for industrial automation applications due to its reliability and versatility. However, please note that Rockwell Automation discontinued the PLC-5 processor on December 31, 2014, and it is no longer available for purchase.

Key Features and Specifications

• Memory: 16K words of user memory

• I/O: 512 (any mix) or 512 in + 512 out (complementary) total I/O, 512 analog I/O

• Communication: 1 DH+ and 1 DH+/Remote I/O (Adapter or Scan) channels, RS-232-C/422-A/423-A configurable serial port

• Performance: 10 ms @ 57.6 kbit/s, 7 ms @ 115.2 kbit/s, 3 ms @ 230.4 kbit/s I/O Scan Time per Rack

• Other: Battery-backed static RAM, EEPROM program backup option, 13 maximum I/O chassis

Advantages

• Reliable and robust: PLC-5 processors were known for their reliability and ability to operate in harsh industrial environments.

• Versatile: The 1785-L20B could handle a wide range of applications, from simple machine control to complex process automation.

• Modular design: The modular architecture of the PLC-5 system allowed for easy expansion and customization.

Considerations

• End-of-life: As mentioned, the 1785-L20B is no longer supported by Rockwell Automation. This means that obtaining replacement parts or technical support may be difficult.

• Migration: If you are currently using a 1785-L20B in your application, you may need to consider migrating to a newer PLC platform, such as the ControlLogix or CompactLogix.

Applications

The 1785-L20B was used in a variety of industries, including:

• Manufacturing: Assembly lines, packaging machines, material handling systems

• Process control: Chemical plants, power plants, water treatment facilities

• Machine control: CNC machines, robotics, automated test equipment

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