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.