B&R 1785-L40B is a PLC-5 series programmable logic controller (PLC) under the Allen-Bradley (Rockwell Automation) brand. Below are the main specifications and features of this product:

Core Technical Specifications

Processor and Memory

• CPU: Intel 80386 architecture, operating at approximately 10–12.5 MHz.
• Memory: 48K words of user memory (greater capacity compared with earlier 32K-word models).
• Data Retention: Built-in battery for preserving the user program during power loss; typical battery life ranges from 84 to 150 days.

I/O Configuration

• Digital I/O Points: Supports up to 2,048 discrete input or output points. These can be configured in any combination (e.g., 500 inputs + 1,500 outputs) and also support complementary configurations (e.g., 2,048 inputs + 2,048 outputs).
• Analog Channels: Supports up to 128 analog channels, depending on the system configuration.

Communication Interfaces

• Remote I/O: Equipped with four DH+/Remote I/O (adapter or scanner) channels.
• Serial Port: One serial port configurable for RS-232, RS-423, or RS-422A.
• Networking: Supports Ethernet/IP communication and provides an Ethernet interface.

Power Supply

• Input Voltage: Supports 120 VAC or 240 VAC.
• Backplane Current Load: Approximately 2.3 A at 5 V.

Programming and Software

• Programming Languages: Supports traditional PLC programming languages such as Ladder Logic.
• Programming Software: Compatible with RSLogix 5.

Applications and Use Cases

• Industries: Widely used in manufacturing, process control, petrochemical, energy management, textiles, and food & beverage processing industries.
• Control Tasks: Suitable for complex logic control, sequential control, and systems requiring a large number of I/O points.