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The Siemens SIMATIC S5 6ES5924-3SA12 is a central processing unit board engineered for use within the legacy SIMATIC S5-150S and 150U automation systems. This module serves as a critical controller, managing real-time logic, timing, and counting functions essential for industrial automation. Designed for durability in demanding environments, it provides reliable instruction execution and I/O management, making it a suitable replacement component for maintaining and restoring legacy control systems in sectors such as steel manufacturing, automotive assembly, and power generation.
This CPU board is primarily utilized in legacy SIMATIC S5-150 series automation architectures. It is intended for use in heavy industrial environments where reliable, continuous control of manufacturing processes is required. It is commonly deployed to replace failing hardware in existing legacy installations to avoid costly system migrations.
| Model | 6ES5924-3SA12 |
| Brand | Siemens SIMATIC S5 |
| Product Type | CPU Board |
| Compatibility | Siemens S5-150S / S5-150U Central Controllers |
| Operating Temperature | 0 to 60 deg C |
| Storage Temperature | -40 to 70 deg C |
| Relative Humidity | 95% non-condensing |
Is the 6ES5924-3SA12 compatible with other S5 series controllers?
This specific board is designed for the S5-150S and 150U series. It is not intended for use in other S5 subrack architectures.
What should I do if the diagnostic LEDs indicate a fault?
First, verify that the board is fully seated in the backplane. If the fault persists, check the system power supply and the status of other modules in the rack to isolate whether the issue is localized to the CPU board or a broader system error.

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All parts are sourced from reputable manufacturers and undergo thorough quality checks.
Extensive stock of industrial automation and discontinued parts, ready for immediate shipment.
Every product — including obsolete items — is covered by a 12-month warranty and 30-day return guarantee.
All product names, trademarks, brands, and logos mentioned on this website are the property of their respective owners.These names and trademarks are used for identification and reference purposes only.We are an independent supplier of industrial automation spare parts.We are not an authorized distributor, dealer, or representative of any manufacturer.Products supplied may include surplus inventory or unused items.We do not claim any affiliation with or endorsement by the original manufacturers.