1785-V40L | Allen Bradley | PLC-5 VMEbus Processor Module

Product Overview

The Allen Bradley 1785-V40L operates as a high-performance VMEbus-based processor within the PLC-5 architecture. This module enables the integration of standard Allen Bradley control logic directly into VME-based computer systems, bridging the gap between high-level computational processing and industrial I/O control. We supply this processor as 100% Brand New and Factory Original, providing a critical solution for maintaining validated legacy systems where the manufacturer has discontinued production.

Technical Specifications

The 1785-V40L utilizes a robust memory structure and backplane interface to manage complex automation tasks:

Engineering Advantages

• Seamless VMEbus Integration: This module allows a standard VMEbus host computer to access PLC data tables directly through 64KB of dual-port RAM. This eliminates the latency associated with serial or Ethernet-based gateways, facilitating real-time data exchange between high-level software and field hardware.

• Legacy Infrastructure Extension: The 1785-V40L supports existing PLC-5 programming logic and Remote I/O (RIO) networks. Engineers can replace aging or failing processors without rewriting thousands of lines of ladder logic, significantly reducing the risks and costs of system migration.

• Robust Diagnostic Capabilities: The processor hardware monitors system status and backplane communication integrity continuously. Integrated front-panel LED indicators provide immediate feedback on CPU health, battery status, and network activity, accelerating on-site troubleshooting.

• High-Reliability Memory Retention: The module utilizes non-volatile memory and battery-backed RAM to protect critical machine parameters during power loss. This ensures that the system retains its state and setpoints, preventing costly re-homing procedures upon restart.

FAQs

• Is this 1785-V40L unit brand new?

  Yes. We guarantee this unit is 100% Brand New and ships in its original factory-sealed packaging. We do not provide refurbished or used surplus modules, ensuring the hardware arrives with zero run-time and pristine gold-plated backplane connectors.

• Can the 1785-V40L replace a standard 1785-L40L?

  While the logical performance (48K memory) is similar, the 1785-V40L is a VMEbus module. It requires a VMEbus chassis and host, whereas the 1785-L40L fits into a standard 1771 I/O chassis. Always verify your backplane type before purchase.

• What software do I use to program this processor?

  This module supports standard RSLogix 5 or 6200 series programming software. You can upload and download programs through the DH+ port or via the VMEbus interface, depending on your system configuration.

• How does the dual-port RAM function in a VME system?

  The 64KB VME memory acts as a shared mailbox. The VME host reads/writes to this memory space simultaneously with the PLC-5 processor, allowing for high-speed, interrupt-driven synchronization between the two environments.