Product Summary
The Allen-Bradley 1785-L40C delivers robust ControlNet processing for demanding applications. This PLC-5/40C controller manages up to 2048 total I/O points. It features 48 Kilowords of battery-backed SRAM memory. Engineers rely on this module for reliable machine control.
Theme Option A: Product Procurement & Buyer Guide
Procurement teams value the 1785-L40C for its proven industrial performance. This module integrates seamlessly into existing 1771 I/O chassis systems. It supports a maximum of 61 total I/O chassis configurations. The processor handles up to 2048 analog I/O points effectively.
Application engineers appreciate the flexible I/O architecture of this controller. It allows any mix of 2048 inputs and outputs. Alternatively, you can configure a complementary setup with 2048 inputs plus 2048 outputs. This flexibility reduces the need for multiple processor modules.
The controller draws 3.3A of backplane current at 5V DC. Its maximum heat dissipation reaches 59 BTU/hour during operation. You must account for these values in your control panel thermal design.
This processor supports the 1785-CHBM ControlNet Hot Backup Cartridge. This feature enables system redundancy for critical processes. It maintains production continuity during module maintenance or failure events.
The module works with a wide range of I/O modules. It supports 1771, 1794, 1746, and 1791 series modules. You can use 8-point, 16-point, and 32-point configurations. Intelligent I/O modules also function correctly with this processor.
The 1785-L40C operates without de-rating from 0 to 60°C. It withstands up to 30G operational shock. Vibration tolerance is 1G at 10-500Hz. These specifications ensure reliable operation in harsh factory environments.
Theme Option F: Deep-Dive Technical FAQ
What is the maximum program scan time for the 1785-L40C?
The processor achieves a scan time of 0.5ms per K-word for bit logic. Typical scan time measures 2ms per K-word. This speed ensures responsive control for time-sensitive applications.
How does the serial port configuration work on this module?
The controller includes a 25-pin D-shell serial port with selectable rates. You can set transmission speeds between 57.6K and 230.4K bits per second. Scan port time adjusts from 10ms per rack at 57.6K to 3ms at 230K.
What memory backup options are available for the 1785-L40C?
The module uses battery-backed static RAM for program retention. You can also use EEPROM program backup with memory modules. Compatible modules include 1785-ME16, -ME32, -ME64, and -M100.
Which network protocols does the 1785-L40C support directly?
This processor features a base-configured RJ45 ControlNet network access port. It transmits I/O data at 5mb per second. You can select network update times from 2 to 100ms. The module also includes a 3-pin default DH+ port.
What are the storage and humidity specifications for this controller?
You can store the module at temperatures from -40 to 85°C. Operating humidity ranges from 5% to 95% noncondensing. This wide range accommodates various global industrial environments.
Logistics & Standard Packaging Details
- One Allen-Bradley 1785-L40C PLC-5/40C ControlNet Processor Module
- One battery for the SRAM backup memory system
- One RJ45 connector for the ControlNet network access port
- One 8-pin mini-DIN connector for programming access
- One 3-pin DH+ port connector for network integration
- One 25-pin D-shell serial port connector for communication
- Product documentation and installation guide
We ship all orders via express delivery services. Our logistics partners include FedEx, UPS, and DHL. This ensures fast and reliable worldwide delivery for your critical automation components.
