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6ES5921-3WB12

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Siemens 6ES5921-3WB12 is a SIMATIC S5/SINUMERIK 3 CPU 921 central processing unit for the 130WB assembly and integrated PLC 130WB.
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Technical specifications for 6ES5921-3WB12

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5921-3WB12
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    SIMATIC S5/SINUMERIK 3 CPU 921 Central Processing Unit
  • Stock:
    1
  • Processor:
    8x305 CPU-130W
  • RAM:
    9 KB
  • PLC user memory:
    2.9 K words
  • Basic memory:
    6 KW
  • User memory options:
    8 KW and 16 KW
  • EPROM positions:
    Two
  • Restart modes:
    Cold, warm, and automatic warm restart
  • Restart organization blocks:
    OB20, OB21, and OB22
  • Weight:
    0.441 lbs (0.2 kg)
  • Tariff Code:
    85389091
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Program Memory Front Controls Restart Logic 130WB Assembly

Features:

  • CPU 921 processing unit for SIMATIC S5/SINUMERIK 3 130WB assemblies
  • 8x305 processing with 9 KB RAM and selectable memory-board capacity
  • EPROM positions, front controls, and three documented restart modes
Within the 130WB architecture, 6ES5921-3WB12 occupies the CPU position that runs the integrated PLC program.

The memory-board arrangement determines how program storage is expanded around the 8x305 processor and its 9 KB RAM area.

Local operation is handled at the front, where the EPROM positions and restart controls support the documented S5 operating sequence for 6ES5921-3WB12.
The Siemens 6ES5921-3WB12 SIMATIC S5/SINUMERIK 3 CPU 921 Central Processing Unit may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6ES5921-3WB12 SIMATIC S5/SINUMERIK 3 CPU 921 Central Processing Unit Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Memory Arrangement

  • Processor board: 6ES5921-3WB12 uses the 8x305 processor in the CPU-130W arrangement.
  • Operating RAM: The CPU provides 9 KB RAM for PLC operating data.
  • User area: The PLC user memory is specified as 2.9 K words.
  • Board options: The 130WB arrangement uses the documented 6 KW basic and 8/16 KW user-memory boards.

Operator Access

  • Control access: Front controls on 6ES5921-3WB12 provide the documented operator interface.
  • Status feedback: Front status LEDs expose controller status.
  • EPROM positions: Two EPROM positions are provided on the CPU/memory-board combination.
  • Storage selection: The installed memory board determines the available non-volatile program-storage arrangement.

Startup Modes

  • Cold restart: 6ES5921-3WB12 supports the documented cold-restart routine.
  • Warm restart: A warm-restart routine is also supported.
  • Automatic mode: Automatic warm restart is available in the documented controller sequence.
  • Organization blocks: OB20, OB21, and OB22 are part of the restart sequence.

Controller Integration

  • Assembly role: 6ES5921-3WB12 is the central CPU for the 130WB assembly.
  • Integrated PLC: The CPU is associated with the integrated PLC 130WB arrangement.
  • Memory-board link: The processor board works with the documented 130WB memory-board options.
  • Controller scope: The assembly combines CPU-130W processing with the S5/SINUMERIK 3 controller structure.
Description
The 130WB CPU arrangement places Siemens 6ES5921-3WB12 at the centre of the SIMATIC S5/SINUMERIK 3 controller, where the CPU 921 handles program execution for the integrated PLC 130WB.

Its 8x305 processor works with 9 KB RAM and a 2.9 K-word PLC user-memory area; the 130WB memory-board arrangement provides the documented 6 KW basic and 8/16 KW user-memory options for 6ES5921-3WB12.

Front access on 6ES5921-3WB12 provides operating controls and two EPROM positions, so the installed memory board determines the available non-volatile program storage.

Restart handling includes cold, warm, and automatic warm restart routines, with OB20, OB21, and OB22 forming the documented organization-block sequence for 6ES5921-3WB12.
Technical notes
Siemens 6ES5921-3WB12 combines CPU-130W processing, 130WB memory-board options, front controls, and documented restart routines.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which memory-board combination should be checked before loading a Siemens 6ES5921-3WB12 program?
Select the 6 KW basic or documented 8/16 KW user-memory board option for 6ES5921-3WB12 before loading the program; the board choice sets available storage.
How much operating memory is available for PLC data on Siemens 6ES5921-3WB12?
Budget the 9 KB RAM and the 2.9 K-word PLC user-memory area of 6ES5921-3WB12 separately; the user area is not the same as the full RAM capacity.
Where are non-volatile program devices fitted on Siemens 6ES5921-3WB12?
Two EPROM positions are provided on the CPU/memory-board combination for 6ES5921-3WB12; confirm the board arrangement before inserting a program device.
What local controls should be checked during startup of Siemens 6ES5921-3WB12?
Before commissioning Siemens 6ES5921-3WB12, verify the RUN/STOP switch, RESET and RESTART pushbuttons, and both status LEDs. Green indicates PLC run, red indicates the stop loop, and both together indicate the cold-restart routine.
Which restart mode should be selected when bringing a Siemens 6ES5921-3WB12 station back online?
For Siemens 6ES5921-3WB12, use OB20 when a new start must rebuild address and module-check lists and clear non-retentive states. Use OB21 or OB22 only when the restart plan must retain counters, timers, flags, and the interrupted-cycle context.
What must be present before Siemens 6ES5921-3WB12 performs an automatic warm restart through OB22?
Siemens 6ES5921-3WB12 requires the RUN/STOP switch in RUN, a healthy backup battery, and OB22 in the address list. If OB22 is absent, the controller processes OB20 instead.

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