SIEMENS CPU MODULE 545-1105

Description

• The Siemens 545-1105 is a central processing unit (CPU) module from the SIMATIC TI505 (formerly Texas Instruments) series. As a legacy automation component, it was widely used in industrial control systems for logic processing and machine control.
  Classic Automation

  Core Technical Specifications

  • Series: SIMATIC TI505 / TI545
    Classic Automation
  • Memory: 96 KB RAM
    Classic Automation
  • Interfaces: 2 x Serial Interface Ports (standard for communication)
    Classic Automation
  • Features:
    • Front-accessible battery replacement (lithium battery required for memory retention).
      Classic Automation
    • User Flash EEPROM for permanent program storage.
      Classic Automation
    • Designed for 1024 I/O points.
      Radwell International

  Strategic Inventory Insights

  Since this is a discontinued product, sourcing it requires a focus on supply-chain transparency and condition verification.

  Radwell International
  • Obsolescence Status: This module is strictly “End-of-Life.” Original manufacturer (Siemens/TI) technical support and warranty coverage are no longer available.
  • Condition Matters: When sourcing, you will typically find “New Surplus,” “New in Original Packaging,” or “Refurbished” units.
    • Avoid: Pulled-from-service units without professional testing, as aging electrolytic capacitors and NVRAM are common points of failure in these legacy boards.
    • Best Practice: Prioritize suppliers that provide a “Test Report” or a documented refurbishment process (e.g., replacement of capacitors and battery).
  • Maintenance Tip: If you have an active system running on a 545-1105, ensure you have a verified program backup on a reliable medium. Because the memory is battery-backed, failure to replace the lithium battery while the CPU is powered on can result in total loss of the application program.

  Replacement Considerations

  If you are planning the lifecycle of a machine currently controlled by this CPU, consider these trade-offs:

  1. Direct Replacement: Installing another 545-1105 is the “Plug-and-Play” route, which avoids the massive labor cost of reprogramming and re-commissioning an entire control system.
  2. System Upgrade: Because these modules are becoming increasingly rare and expensive, migrating to a modern control platform (like the S7-1500 series) is the standard recommendation for systems intended to operate for another 5–10 years.

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