PLC-5/40E EtherNet/IP Controller | Allen-Bradley 1785-L40E | 48K Words Memory

Overview

The Allen-Bradley 1785-L40E is a PLC-5/40E Ethernet/IP controller engineered for high-performance industrial automation and process control.
It provides robust communication, advanced data handling, and reliable system integration within PLC-5 networks.
Designed for complex automation tasks, this processor supports large I/O counts, multiple communication interfaces, and seamless connectivity with remote I/O systems.

Technical Specifications

•  Manufacturer: Allen-Bradley

•  Product Line: PLC-5 Series

•  Model Number: 1785-L40E

•  Product Type: Programmable Logic Controller (PLC)

•  Processor Type: PLC-5/40E

•  Memory Capacity: 48 KWords

•  Battery Type: 1770-XYC (for memory retention)

•  EEPROM Backup Support: Yes (supports 1785-ME16, -ME32, -ME64, -M100)

•  Embedded Communication Interfaces:

• 4 DH+/Remote I/O channels (Adapter or Scanner)

• 1 Serial Port (RS-232/RS-422A/RS-423 configurable)

•  Maximum Total I/O: 2048 (any mix) or 2048 in + 2048 out (complementary)

•  Maximum Analog I/O: 2048

•  I/O Scan Time (per rack):

• 10 ms at 57.6 kbit/s

• 7 ms at 115.2 kbit/s

• 3 ms at 230.4 kbit/s

•  I/O Link Capacity: Up to 32 per link

•  Expansion Capacity: Supports 61 local and 60 remote I/O chassis

•  Memory Type: Battery-backed static RAM

•  Protected Memory: Not supported

•  Power Dissipation: 17.3 W

•  Backplane Current Load: 3.3 A

•  Power Supply Compatibility: 1771-P4S, -P6S, -P4S1, -P6S1

•  Operating Temperature Range: 0°C to 60°C (32°F to 140°F)

•  Non-Operating Temperature Range: -40°C to 85°C (-40°F to 185°F)

•  Weight: 1.36 kg (3.00 lbs)

Features

•  EtherNet/IP Connectivity: Provides fast and secure communication between controllers, I/O, and supervisory systems.

•  Scalable Architecture: Supports up to 2048 I/O points with modular expansion.

•  High Reliability: Industrial-grade design ensures stability under temperature variations and harsh conditions.

•  Flexible Communication: Multiple serial and DH+/Remote I/O ports enhance system integration.

•  Modular Power Supply Support: Compatible with various 1771 series power modules for flexible configuration.

•  Efficient Memory Management: 48K word capacity for large-scale automation programs.

Applications

The Allen-Bradley 1785-L40E controller is widely used in:

•  Manufacturing automation lines
•  Process control in oil, gas, and chemical industries
•  Power generation and energy systems
•  Material handling and logistics
•  Water and wastewater treatment facilities

FAQ

Q1: What type of processor is the 1785-L40E?
A1: It is a PLC-5/40E processor with Ethernet/IP capability.

Q2: What communication interfaces does it support?
A2: The module supports DH+/Remote I/O and serial communication (RS-232/422A/423).

Q3: How much user memory is available?
A3: The controller offers 48 KWords of memory.

Q4: Is EEPROM backup supported?
A4: Yes, via 1785-ME16, -ME32, -ME64, and -M100 memory modules.

Q5: What power supplies are compatible with this model?
A5: It is compatible with 1771-P4S, -P6S, -P4S1, and -P6S1 supplies.