Product Details
Product Overview
The Allen Bradley 1785-L40C functions as a high-performance ControlNet processor within the legendary PLC-5 platform. It bridges complex logic execution with high-speed deterministic networking, making it a cornerstone for large-scale industrial applications. We supply this module as 100% Brand New and Factory Original, providing the precise hardware required to maintain or expand established automation architectures without the risks associated with used surplus.
Technical Specifications
The 1785-L40C delivers robust processing power and expansive I/O management through the following hardware parameters:
| Feature | Specification |
| Processor Type | PLC-5/40 ControlNet |
| User Memory | 48 Kilowords (Battery-Backed Static RAM) |
| Total I/O Capacity | 2048 (Any Mix) or 2048 In/Out (Complementary) |
| Max Analog I/O | 2048 |
| ControlNet Throughput | 5.0 Mbits/s |
| Max I/O Chassis | 61 Total (Up to 32 per Universal Remote Link) |
| Onboard Ports | 1 RS-232-C/422-A/423-A; ControlNet Port |
| Backup Option | EEPROM Support (1785-ME16 to -M100) |
| Scan Time | 3 ms at 230.4 kbits/s (minimum I/O scan) |
| Weight | 4.19 lbs (1.90 kg) |
Engineering Advantages
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Deterministic ControlNet Integration: The integrated ControlNet port enables high-speed, repeatable communication for time-critical data. Unlike standard peer-to-peer networks, this processor ensures that critical I/O updates occur at scheduled intervals, eliminating "network jitter" in synchronized motion or process loops.
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Massive I/O Scalability: The 1785-L40C manages up to 2048 I/O points across 61 chassis. This capacity allows engineers to centralize complex logic for entire production lines into a single processing node, simplifying code management and inter-processor messaging.
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Multi-Layer Memory Protection: This module utilizes battery-backed Static RAM to preserve the data table and user program during power loss. Furthermore, it supports optional EEPROM modules (1785-ME series), providing a non-volatile "Gold Copy" of the application to prevent downtime from battery depletion.
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Versatile Peripheral Connectivity: The onboard RS-232/422/423 port communicates directly with HMIs, weigh scales, and barcode scanners. By supporting multiple electrical standards, the processor removes the need for external signal converters in many legacy installations.
FAQs
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Is this 1785-L40C unit truly brand new?
Yes. We guarantee this unit is 100% Brand New and ships in its original factory packaging. It has never seen field service, ensuring that the internal capacitors and memory circuits provide their full engineered lifespan.
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What is the advantage of the "C" (ControlNet) version over the standard 1785-L40B?
The 1785-L40C specifically includes a ControlNet communication port. While the "B" version relies primarily on DH+ (Data Highway Plus), the "C" version allows the processor to act as a node on a ControlNet bridge, facilitating much faster data transfer and better integration with modern ControlLogix-era bridges.
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How do I handle the battery replacement without losing the program?
The processor features a capacitor that maintains the program for approximately 30 minutes while you swap the battery. For maximum safety, we recommend performing the battery change while the chassis remains powered up, or ensuring a current EEPROM backup exists.
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Can I use this processor for analog-heavy applications?
Absolutely. The 1785-L40C supports up to 2048 analog I/O points. Its 48K word memory provides sufficient space for complex scaling blocks and PID loop instructions required for sophisticated process control.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Evolving SCADA System Architectures in Industrial Automation
A robust Supervisory Control and Data Acquisition (SCADA) system serves as the heartbeat of modern industrial operations. Understanding SCADA system architecture is vital for engineers designing efficient control systems. These architectures have evolved from isolated, monolithic structures to highly interconnected, networked ecosystems. Choosing the right design requires balancing data visibility, processing power, and long-term scalability requirements.
Choosing the Right Controller: PLC vs. Motion Controller in Industrial Automation
Selecting the optimal control architecture is a foundational decision in industrial automation. Engineers must frequently choose between a Programmable Logic Controller (PLC) and a dedicated Motion Controller. While both systems manage machinery, their underlying design philosophies differ significantly, impacting performance, scalability, and system integration.
Mastering PLC Power Supply Architectures and Operating Voltages
Selecting the correct operating voltage is a critical step in designing reliable industrial automation systems. Whether you are working with a compact PLC or a large-scale DCS, your power architecture dictates the system's longevity. In this guide, we explore the standard voltage ranges and power distribution strategies required to maintain stable factory automation operations.