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B&R 1785-l40b Processor Module

The 1785-L40B is a PLC-5/40 Processor Module from the Rockwell Automation / Allen-Bradley PLC-5 family.

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B&R 1785-l40b

The 1785-L40B is a PLC-5/40 Processor Module from the Rockwell Automation / Allen-Bradley PLC-5 family. It is designed for medium to large-scale industrial automation applications and is widely used in manufacturing, power generation, water treatment, and process control systems.

Product Specifications

Parameter Specification
Product Model 1785-L40B
Series PLC-5/40
User Memory 48K Words SRAM
Maximum Total I/O 2,048 I/O Points
Maximum Analog I/O 2,048 Points
Communication Channels 4 DH+/Remote I/O Channels
Serial Port RS-232-C / RS-422-A / RS-423-A
Maximum I/O Chassis 61
Backplane Current Load 3.3 A @ 5 VDC
Memory Backup Battery-backed SRAM with optional EEPROM backup
Status Discontinued by Manufacturer

 

Key Features

  • High-capacity 48K-word memory for complex control programs.
  • Supports up to 2,048 digital and analog I/O points.
  • Four integrated DH+ / Remote I/O communication channels.
  • Battery-backed memory preserves application data during power loss.
  • Optional EEPROM modules (1785-ME16, 1785-ME32, 1785-ME64, 1785-M100) for permanent program storage.
  • Compatible with existing PLC-5 control architectures, simplifying system upgrades and maintenance.

Applications

The 1785-L40B is commonly used in:

  • Manufacturing production lines
  • Chemical and petrochemical plants
  • Power generation facilities
  • Water and wastewater treatment systems
  • Material handling and conveyor systems
  • Legacy PLC-5 installations requiring long-term support and spare parts

Product Status

The 1785-L40B has been discontinued by Rockwell Automation, but it remains widely available through surplus, refurbished, and repair service providers. Many facilities continue to operate PLC-5 systems due to their reliability and extensive installed base.

 

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