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      6ES5928-3UB21

      CPU Module
      In Stock
      Ships by Friday, November 6
      Fast Shipping Available
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Siemens 6ES5928-3UB21 is a SIMATIC S5 CPU 928B central processing unit for S5-135U and S5-155U systems. It is the new-version single-width design with a slot for a second interface.

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      Technical specifications for 6ES5928-3UB21

      • Manufacturer:
        Siemens
      • Product Category:
        PLC Systems
      • Spare Part Number:
        6ES5928-3UB21
      • Estimated shipping dimensions:
        2x20.4x25.7cm
      • Weight:
        0.38 kg
      • Tariff Code:
        8537101190
      • Counliy of origin:
        Germany
      • Product line:
        SIMATIC S5
      • Processor:
        CPU 928B
      • Host systems:
        S5-135U / S5-155U
      • Mechanical version:
        Single-width
      • Interface provision:
        Second-interface slot
      • Lifecycle:
        Discontinued
      • Listed successor:
        None
      View as PDF Ask for Quote

      Information

      Overview Manuals Common Applications Product Precautions
      During a legacy S5 controller outage, Siemens 6ES5928-3UB21 must be assessed together with rack assignment, program backup and the installed second-interface configuration before exchange.
      • CPU 928B central processor
      • S5-135U and S5-155U
      • Single-width version
      • Slot for second interface

      The controlled engineering path is SIMATIC S5 process I/O → S5 rack and backplane → CPU 928B program execution → Control outputs and communications; preserve the approved system record and verify the intended final response before release.

      Important Notice: Confirm the S5 rack, slot, memory state and second-interface option before exchanging the CPU.

      Siemens 6ES5928-3UB21 Manuals & Downloads
      Siemens 6ES5928-3UB21 Technical Reference (PDF)Siemens 6ES5928-3UB21 Installation & Commissioning Guide (PDF)

      Important Notice: The Technical Reference organizes product identity, interfaces and engineering data; the Installation & Commissioning Guide provides a separate field sequence for preparation, connection checks, functional proving and acceptance.

      S5-135U control
      Central processing in an installed SIMATIC S5-135U system.
      S5-155U control
      CPU replacement or maintenance in a documented S5-155U rack.
      Legacy spare strategy
      Exact-order-code stocking for end-of-life S5 installations.
      Controlled restart
      Program restoration, I/O validation and sequence acceptance after exchange.
      Apply these exact-model controls to Siemens 6ES5928-3UB21 before isolation, replacement, reconnection, energization and final release.
      1
      Back up the approved S5 program and operating data before removal.
      2
      Confirm the rack, slot and complete 6ES5928-3UB21 identity.
      3
      Record the installed second-interface option and all connected cables.
      4
      Use ESD-safe handling for the CPU and memory components.
      5
      Do not treat CPU 928A or another CPU 928B order number as automatically equivalent.
      6
      Check rack power and backplane condition before fitting the spare.
      7
      Validate CPU state, I/O addressing and communications during staged startup.
      8
      Archive the restored program, diagnostics and as-left hardware record.

      Technical notes

      Preserve the S5 program, operating data and second-interface configuration before CPU exchange. Validate CPU state, I/O addressing and communications during the controlled restart.

      FAQ View All FAQ

      • Which SIMATIC S5 racks accept Siemens 6ES5928-3UB21?
        It is specified for SIMATIC S5-135U and S5-155U systems.
      • Which CPU 928B execution role is assigned to Siemens 6ES5928-3UB21?
        It is the CPU 928B central processing unit.
      • Which second-interface provision distinguishes Siemens 6ES5928-3UB21?
        Siemens describes it as the new-version single-width CPU with a slot for a second interface.
      • What lifecycle constraint affects replacement planning for Siemens 6ES5928-3UB21?
        The Industry Mall record states that the product was deleted without replacement.
      • What compatibility review is required before substituting a CPU 928A for Siemens 6ES5928-3UB21?
        Review the complete hardware, interface configuration and project because the CPU 928A historical path is only partially compatible.
      • Which program and interface records must be backed up before exchanging Siemens 6ES5928-3UB21?
        Preserve the user program, operating data, interface configuration and current diagnostics.
      • Which startup checks accept a replacement Siemens 6ES5928-3UB21?
        Verify CPU startup, configured I/O, communications and the machine sequence against the approved test plan.
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