The Allen-Bradley 1785-L20B is a processor module for the PLC-5/20 programmable logic controller (PLC) from Rockwell Automation. Introduced in 1985 and discontinued in 2014, it is a mid-range processor module suitable for various industrial automation applications.

Key Features

The Allen-Bradley 1785-L20B has several key features:

Processor: It uses a 32-bit RISC processor.

Memory: It includes 16K words of SRAM memory.

I/O: It supports 512 inputs and 512 outputs.

Communication: It has Data Highway Plus and RS-232-C/422-A/423-A communication ports.

Programming: It supports ladder logic, function chart, and instruction list programming.

Applications: It is ideal for industrial automation, manufacturing, packaging, material handling, and discrete control.

Technical Specifications

Power Supply: It requires a 24 VDC power supply.

Power Consumption: It consumes 35 W of power.

Operating Temperature: It operates between -20 to 60 °C (-4 to 140 °F).

Storage Temperature: It can be stored at temperatures from -40 to 85 °C (-40 to 185 °F).

Vibration: It withstands 5 g rms, 10 to 500 Hz vibration.

Shock: It can endure 15 g, 11 ms shock.

Dimensions: It measures 10.25 x 7.88 x 3.54 inches (260 x 200 x 90 mm).

Weight: It weighs 3.5 lb (1.6 kg).