Product Overview
The Siemens 6ES5928-3UB12 CPU928B Central Controller is a high-performance automation module designed for use in S5-135U and S5-155U central controller systems. This unit supports both single and multiprocessor operation, accommodating up to four CPUs. The Siemens 6ES5928-3UB12 delivers exceptional bit and word processing speeds and is universally applicable for cyclic, time-controlled, real-time controlled, interrupt-driven, and delayed control tasks. Programming is performed using STEP 5. The module’s construction comprises two PCBs in double Eurocard format, with a front plate width of 2 2/3 standard plug-in stations.
Technical Specifications
| Parameter |
Value |
| Supply Voltage |
5V±5%, 24V+25%/-17% |
| Current Consumption at 5V |
5 A typical |
| Current Consumption at 24V |
760 mA max |
| Backup Voltage |
3.4V |
| Backup Current |
20 μA typical at 25°C |
| User Memory (max) |
64 x 210 bytes (EPROM or RAM) |
| DB RAM |
46 x 210 bytes |
| Flags |
2048 |
| S Flags |
8192 |
| Timers |
256 |
| Counters |
256 |
| PG Interface Rate |
9600 bps |
| Dimensions (W x H x D) |
40.64 x 233.4 x 160 mm |
| Weight |
Approx. 1 kg |
Industry Applications
The Siemens 6ES5928-3UB12 is ideal for complex automation tasks in manufacturing, process control, and material handling. Its multiprocessor capability makes it suitable for distributed control in large-scale installations such as automotive assembly lines, chemical processing plants, and packaging systems. The module’s fast processing ensures reliable real-time performance in demanding environments.
Compatibility and Integration
The Siemens 6ES5928-3UB12 integrates seamlessly into S5-135U and S5-155U backplanes via the S5 bus. It includes a permanently installed PG interface (SI1) for programmers and operator panels. Optional serial interfaces (V.24, TTY, RS 422A/485) are available via submodules. From version 6ES5 928-3UB12, a SINEC L1 interface is supported. This flexibility allows easy integration with existing control networks and expansion modules.
Troubleshooting Common Issues
The Siemens 6ES5928-3UB12 features a mode switch with RUN and STOP positions, plus momentary-contact functions for overall reset, reset, and restart. If the CPU fails to enter RUN, check the supply voltages (5V and 24V) and ensure the user memory submodule is properly seated. An overall reset (momentary-contact switch down) clears all RAM areas and reinitializes the module. For sustained performance, verify that the backup battery maintains voltage above 3.4V.
Selection Guide and Purchasing Advice
Before purchasing the Siemens 6ES5928-3UB12, confirm compatibility with your S5-135U or S5-155U central controller. Obtain the necessary user memory submodule (RAM or EPROM) and interface submodules if required. For reliable sourcing of this industrial automation module and other spares, trust ubest101 for prompt delivery and genuine components.