GE WES5120 2340-21005

Description

Product Overview

The GE WES5120 2340-21005 is a central processing unit (CPU) module for the GE Series 90-70 Programmable Logic Controller (PLC). This module, part number 2340-21005, serves as the brain of the 90-70 rack, executing the user control program, managing I/O communication, and handling system diagnostics. As a high-performance CPU for its generation, the GE WES5120 provided robust control capabilities for complex automation tasks in industrial applications.

Key Product Parameters

• Product Type: Central Processing Unit (CPU) Module

• Compatible PLC System: GE Series 90-70

• Processor: Likely based on a high-performance Intel or Motorola microprocessor.

• Memory: Contains both program memory (RAM/EEPROM) and data memory (RAM), with configurations varying by the specific -21005 suffix.

• I/O Capacity: Supports a large number of discrete and analog I/O points across multiple racks via the Genius LAN (Genius Bus).

• Communication Ports: Features a serial programming port (RS-232/RS-485) and an interface for the Genius Bus controller.

• Programming Language: Supports ladder logic, statement list, and other IEC 61131-3 languages via GE’s Proficy Logic Developer (formerly Cimplicity Machine Edition) software.

• Backup: Typically uses a lithium battery for RAM backup and may support flash memory for program storage.

Advantages and Core Features

The primary advantage of the GE WES5120 2340-21005 was its powerful processing and extensive I/O handling capability within the modular 90-70 platform. It offered deterministic scan times suitable for demanding real-time control applications. Its integration with the high-speed Genius Bus allowed for distributed I/O over long distances, a significant feature for large plants. The CPU featured comprehensive self-diagnostics and fault logging, aiding in troubleshooting. The robust hardware design of the WES5120 made it a reliable workhorse for heavy industrial automation.

Application Scenarios

This CPU was deployed as the main controller in large-scale, complex industrial systems:

• Automotive Manufacturing: Controlling entire body shops, paint lines, and final assembly conveyance systems.

• Material Handling: Managing large warehouse automation, sortation systems, and airport baggage handling networks.

• Water/Wastewater Treatment: Acting as the central controller for large treatment plants with distributed filter beds, clarifiers, and pumping stations.

• Metals Processing: Controlling rolling mill lines, continuous casting machines, and annealing furnaces.

• Power Generation: Managing balance-of-plant systems and turbine auxiliaries.

Comparison with Competing Products

During its active era, the GE WES5120 competed with CPUs from Allen-Bradley (PLC-5/40, PLC-5/80) and Siemens (Simatic S5-155U). Its key differentiator was the Genius Bus, which offered a robust, token-passing network for I/O that was often compared favorably to Allen-Bradley’s Remote I/O and Data Highway. Compared to newer PACs and CPUs, the WES5120 is now a legacy product, valued for its proven stability in existing installations rather than for new features. Its architecture is less integrated but often considered highly robust for its intended applications.

Selection Guide and Important Notes

Selection of the GE WES5120 2340-21005 is now almost exclusively for spare part replacement in an existing 90-70 system. Careful verification against the failed unit is essential.

Important Precautions:

• Legacy Product: The Series 90-70 platform is discontinued. The WES5120 CPU must be sourced from the refurbished/surplus market.

• Exact Match Required: The suffix (2340-21005) is critical. Different suffixes indicate variations in memory size, firmware, or performance. Matching the exact part number from the failed unit is mandatory.

• Configuration & Memory: The CPU contains the system firmware and user program. Replacing it requires either transferring the program from a backup or installing a new program. The lithium battery must be checked and replaced if necessary.

• Migration Consideration: For system upgrades, planning a migration to a modern platform like GE’s RX3i or a competitor’s system is strongly advised for long-term support.

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