Description
Siemens CPU 928B Central Controller – Reliable Control Unit
The Siemens CPU 928B is a strong central unit for S5-135U/155U series. It handles fast logic, word and bit jobs. You can run single or multiprocessor mode with up to four CPUs.
Main Technical Details
- Model: CPU 928B (6ES5928-3UB12)
- Series: S5-135U / 155U central controller
- Dimensions (board): 40.64 × 233.4 × 160 mm
- Packaging size: 25.9 × 20.8 × 5.5 cm
- Net weight: 0.991 kg (~1.0 kg)
- Supply voltage: 5 V ±5% and 24 V +25% / -17%
- Typical current: 5 V → 5 A; 24 V → 760 mA max
- Backup voltage: 3.4 V, backup current 20 μA @ 25 °C
- User memory: Up to 64 × 210 bytes code/data
- Additional DB RAM: 46 × 210 bytes for data blocks
- Supports 256 Program Blocks, 256 Function Blocks, 256 Data Blocks, up to 253 free DB/ DX blocks
- Flags: 2048, S-flags: 8192, Timers: 256, Counters: 256
- PG Interface: built-in SI1 front port, serial rate 9600 bps
- Optional serial links: V.24 / TTY / RS422A/485 or SI1
Performance & Features
- Very fast bit and word processing for reliable control.
- Supports interrupts, cyclic tasks, time-controlled tasks (9 time bases), real-time and delayed execution.
- Single or multi CPU setup allows flexible expansion.
- Memory submodule use lets you choose EPROM or RAM per need.
- Clear RUN / STOP status LEDs and front mode switch make maintenance easy.
- Separate reset and restart modes help safe operation after errors.
- Compact board fits standard rack format for easier panel design.
- Wide industrial supply voltage ranges ensure stable behavior in harsh conditions.
Operation & Installation Notes
- Install as central controller in S5-135U / 155U rack.
- Always use a correct memory submodule (RAM or EPROM) before start.
- Allow proper cooling and avoid moisture for stable runtime.
- Use PG interface for programming or connecting OP systems.
- Switch to STOP before changing memory or wiring.
Warranty & Shipping
- 12-month warranty applies.
- Ships via FedEx, UPS, DHL globally.
FAQ
Can I run more than one CPU 928B together?
Yes. The unit supports up to four CPUs in one rack for multiprocessor projects.
What memory does it need to work?
You need a user memory submodule (RAM or EPROM) before you can run any program.
How do I know the CPU is running?
Check the green RUN LED on front. If red STOP LED lights, CPU is idle.
Can I reset the CPU without clearing user data?
Yes. Use Restart switch. It resumes from current memory state without clearing data.
Is CPU 928B stable in harsh environments?
Yes. Its wide supply range and industrial grade build help stable use in different conditions.
Contact & Order Info
- WhatsApp: +86 158 8020 0923
- Email: info@oiltechcontrols.com
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