1785-L40C15 | Allen-Bradley PLC-5/40 ControlNet Processor Module

Description

The Allen-Bradley 1785-L40C15 is a PLC-5/40 ControlNet processor module offering advanced control capabilities for complex industrial applications. It supports up to 2048 total I/O points with configurable analog and digital channels, provides two ControlNet ports, and multiple communication interfaces including DH+, Remote I/O, and serial connections. The module features up to 48 Kwords of controller memory with battery-backed static RAM and supports EEPROM program backup. Compatible with 1771, 1746, 1791, and 1794 I/O systems, it installs in left-most slots of 1771 chassis and supports controller redundancy.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model Number: 1785-L40C15

• Product Line: PLC 5

• Product Type: Processor Module

• Weight: 3.00 lbs (1.36 kg)

• Maximum Total I/O: 2048 points (digital/analog)

• Max User Memory: 48 Kwords

• Program Scan Time: 0.5 ms per Kword (bit logic), 2 ms per Kword (typical)

• Control Coprocessor Expansion Port: Yes

• Communication Ports: Data Highway Plus (DH+), Remote I/O (RIO), Serial, Two ControlNet

• Compatible I/O Systems: 1771, 1746, 1791, 1794 (digital, analog, intelligent modules)

• Hardware Addressing: 2-slot, 1-slot, 1/2-slot

• Battery: Allen-Bradley 1770-XYC

• EEPROM Program Backup: Supported with 1785-ME16, ME32, ME64, M100 modules

• Controller Redundancy: Supported

• I/O Scan Times: ControlNet 0.5 ms/rack; Remote I/O 3–10 ms depending on baud rate

• RS-232-C/422-A/423-A Ports: 1

• Maximum I/O Chassis: 125 local, 60 universal remote

Application Scenarios

Suitable for high-performance industrial control systems, the 1785-L40C15 enables seamless integration of digital and analog I/O, redundancy, and networked communication for PLC-5 automation solutions.

Comparison with Similar Models

• 1785-L40C15: PLC-5/40 ControlNet processor, dual ControlNet ports

• 1785-L60C15: Higher capacity memory and I/O points for complex automation

• 1785-L20C15: Entry-level PLC-5/20 processor module with fewer I/O points

FAQs

Q1: What type of communication ports are available on 1785-L40C15?
A1: It provides DH+, Remote I/O, serial, and two ControlNet ports.

Q2: Can it support redundant control?
A2: Yes, the module supports controller redundancy configurations.

Q3: What I/O systems are compatible?
A3: Compatible with 1771, 1746, 1791, and 1794 I/O modules, including digital, analog, and intelligent types.