1785-L40C15 Allen-Bradley PLC-5/40C ControlNet Processor Unit

Availability: 20 left in stock

Product Overview The Allen-Bradley 1785-L40C15 operates as a heavy-duty, high-capacity central processing unit for the legacy PLC-5 control platform. This...

SKU: 1785-L40C15

Manufacturer: Allen Bradley
Product No.: 1785-L40C15
Product Type: Power Monitoring Systems
Product Origin: USA
Payment:T/T, Western Union
Weight: 1360g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen-Bradley 1785-L40C15 operates as a heavy-duty, high-capacity central processing unit for the legacy PLC-5 control platform. This PLC-5/40C controller executes critical discrete logic, math computation, and complex industrial process sequences across large-scale facility architectures. It provides 48 Kwords of battery-backed static RAM (SRAM) memory to manage application code, with support for expansion modules up to 100 Kwords. Equipped with twin concurrent ControlNet coax ports, Data Highway Plus (DH+), and universal Remote I/O (RIO) scanners, this module aggregates real-time data across extensive distributed factory networks. We supply this processor as a 100% brand new, original factory component to ensure structural integrity and precise electrical operation inside legacy industrial slots.

Technical Specifications

The following technical table provides the absolute electrical, processing, and hardware communication parameters for the 1785-L40C15 processor:

Specification	Details
Manufacturer	Allen-Bradley / Rockwell Automation
Catalog Number	1785-L40C15
Product Line	PLC-5 Series (PLC-5/40C)
Condition	100% Brand New Original Factory Stock
Module Type	Programmable Logic Controller Processor
Onboard User Memory	48 Kwords Battery-Backed Static RAM (SRAM)
Total I/O Capacity	2048 Points Maximum (Any Mix of Digital or Analog)
Bit Logic Scan Time	0.5 milliseconds per Kword
Typical Program Scan Time	2.0 milliseconds per Kword
Backplane Power Consumption	3 Amps at 5V DC
Communication Interface	2 x ControlNet Coax, 1 x DH plus, 1 x Remote I/O Scanner, 1 x Serial
Maximum Total I/O Chassis	125 Total Chassis Racks
Max Universal Remote I/O Racks	60 Racks
Hardware Addressing Modes	2-slot, 1-slot, or 1/2-slot Addressing
EEPROM Backup Expansion Options	1785-ME16, 1785-ME32, 1785-ME64, 1785-M100
Physical Enclosure Installation	Left-most slot of 1771-A1B, -A2B, -A3B, -A3B1, or -A4B Chassis
Backup Battery Requirement	Allen-Bradley 1770-XYC / 1770-XYCM
Operating Ambient Temperature	0 to 60 degrees C (32 to 140 degrees F)
Net Hardware Weight	1.36 kg (3.00 lbs)

Engineering Advantages

High-Speed Dual ControlNet Determinism: Two distinct onboard ControlNet coax connections manage real-time I/O data transfers with complete time-critical determinism. The architecture scans up to 125 total chassis racks at a blazing average update speed of 0.5 milliseconds, avoiding network collisions and buffering delays.
Multi-Network Protocol Bridging: The module bridges legacy Data Highway Plus (DH+) networks, Universal Remote I/O chains, and standard high-speed ControlNet backplanes simultaneously. This capability allows the CPU to cross-communicate with 1771, 1794 Flex, 1746 SLC, and 1791 I/O blocks without using auxiliary standalone gateway hardware.
Hot Backup Redundancy Support: Inserting an optional 1785-CBHM cartridge configures the processor for high-availability hot-backup operations. The master unit establishes a bumpless transition track to a secondary backup processor, which protects continuous chemical or processing lines from system failures.
Flexible Slot Optimization & Density Scaling: The integrated chassis interface supports 2-slot, 1-slot, and high-density 1/2-slot hardware addressing methods. This granularity enables instrumentation engineers to maximize spatial efficiency inside standard 1771 enclosures by squeezing up to 2048 I/O points into tight terminal constraints.
Rugged Circuit Guarding: The hardware tolerates standard factory ambient heat up to 60 degrees C. Specialized isolation circuits on the communication channels suppress transient electromagnetic interference (EMI) coming from large active variable frequency drives (VFDs) and heavy manufacturing switchgear.

FAQs

Where exactly must I install the 1785-L40C15 processor module within the physical 1771 rack?

You must install the 1785-L40C15 processor exclusively inside the left-most master slot of a 1771 universal chassis backplane (such as the 1771-A1B, 1771-A2B, or 1771-A4B). The module requires connection to the primary backplane pins to drive power distribution and execute network scanning functions across the slot bus.
How can I secure the user memory structure against battery depletion during plant maintenance cycles?

To secure your data files indefinitely, plug an optional non-volatile EEPROM memory module (such as the 1785-ME32, 1785-ME64, or 1785-M100) directly into the integrated expansion port of the processor. This accessory stores a permanent logic image, which prevents memory erasure if the main 1770-XYC lithium battery fails while the cabinet power remains disconnected.
Does this processor support connection to older DH networks?

Yes. While the module includes native Data Highway Plus (DH+) ports, you can interface with standard, older Data Highway networks by utilizing an external 1785-KA communication module plugged into the expansion port.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.