Allen-Bradley 1785-L40L PLC-5/40L Standard Processor Module

2026-04-20T22:43:16-07:00

Type: Processor Module
Price: 66.00

Product Overview

The Allen-Bradley 1785-L40L stands as a high-capacity central processing unit within the classic PLC-5 family. This standard processor manages complex automation tasks by coordinating extensive I/O networks and executing sophisticated control logic. It features 48 Kilowords of user memory and supports a vast I/O capacity of up to 2048 points. We offer this module in 100% Brand New condition, providing a definitive solution for maintaining or expanding large-scale industrial operations that rely on the proven PLC-5 architecture.

Technical Specifications

The following parameters define the high-performance capabilities of the 1785-L40L:

Parameter | Specification
Processor Type | PLC-5/40L Standard Processor
Max User Memory | 48 Kilowords
Max Total I/O | 2048 (any mix)
Max Analog I/O | 2048
I/O Scan Time | 0.5 ms (Extended Local)
Max I/O Chassis | 61 Total (16 Extended Local / 32 Universal Remote)
Communication Ports | 1 x RS-232-C/422-A/423-A
Backup Memory | EEPROM Support (via 1785-ME/M modules)
RAM Type | Battery-Backed Static RAM

Engineering Advantages

The 1785-L40L solves complex integration and uptime challenges in established industrial facilities:

Massive Networking Flexibility: This processor manages up to 61 I/O chassis across universal remote and extended local links. This capability allows engineers to centralize control for massive production lines without sacrificing localized response times.

Rapid Logic Execution: With a scan time as low as 0.5 ms for extended local racks, the 1785-L40L handles high-speed discrete and analog signals with precision, reducing jitter in sensitive control loops.

Dual-Tier Data Protection: The module utilizes battery-backed RAM for active runtime data and supports EEPROM program backup. This dual approach prevents costly program loss during extended power outages or battery failures.

Legacy System Longevity: Installing a Brand New 1785-L40L eliminates the risks associated with used or refurbished units, such as unknown component fatigue or degraded capacitors. This ensures your validated system continues to operate for years without requiring a full, disruptive migration to newer platforms.

FAQs

What memory backup options does the 1785-L40L support?

The processor uses battery-backed static RAM as standard. For non-volatile program storage, you can utilize the 1785-ME16, -ME32, -ME64, or -M100 EEPROM modules to ensure your logic remains intact without power.

How many I/O points can this processor handle?

The 1785-L40L supports a maximum of 2048 I/O points in any mix, or 2048 inputs and 2048 outputs in a complementary configuration, making it suitable for large-scale plant automation.

Is this a Brand New original product?

Yes. This unit is 100% Brand New and original. While the PLC-5 series is a legacy line, our new-in-box stock provides the highest possible reliability and original factory performance specifications.

Can I use the Control Coprocessor Expansion port for extra tasks?

Yes. The 1785-L40L includes a coprocessor expansion port, allowing you to offload specialized tasks—such as advanced math or custom communication protocols—to a separate module without impacting the main CPU scan time