Siemens SIMATIC S5 6ES5928-3UB12 CPU 928B Central Controller Module

Product Overview

The Siemens SIMATIC S5 6ES5928-3UB12 CPU 928B serves as a high-performance central controller for S5-135U and S5-155U automation systems. This module excels in demanding industrial environments by providing rapid bit and word processing capabilities. Engineers utilize this CPU in both single and multiprocessor configurations to manage complex logic tasks. The 6ES5928-3UB12 ensures consistent performance through cyclic, time-controlled, and hardware-interrupt-driven execution.

Technical Specifications

• Brand: Siemens
• Model: 6ES5928-3UB12 (CPU 928B)
• Series: SIMATIC S5
• Operating Voltage: 5V DC (±5%) and 24V DC (+25%/-17%)
• Current Consumption: 5A typical at 5V; 760mA max at 24V
• User Memory: Up to 64KB (EPROM or RAM)
• Integrated DB RAM: 46KB
• Processing Resources: 2048 Flags, 8192 S-Flags, 256 Timers, 256 Counters
• Program Blocks: 256 PB, 256 SB, 256 FB, 256 FX
• Data Blocks: 256 DB and 256 DX (253 available each)
• Dimensions: 40.64 x 233.4 x 160 mm
• Degree of Protection: IP 00

Compatibility and Installation

• System Compatibility: Designed specifically for S5-135U and S5-155U central controllers.
• Multi-Processor Use: Supports up to four CPU 928B units simultaneously.
• Physical Installation: Occupies 2 2/3 standard plug-in stations in the S5 rack.
• Bus Connection: Connects via two backplane connectors to the S5 system bus.
• Programming Language: Compatible with standard STEP 5 software.

Diagnostics and Maintenance

• Mode Control: Integrated front-panel switch allows for RUN, STOP, and Momentary-Contact operations.
• Status Indicators: Front-facing LEDs provide clear visual status for RUN and STOP modes.
• Memory Management: Supports Overall Reset, Reset, and Restart functions for system recovery.
• Maintenance Convenience: Modular design using double Eurocard formats simplifies physical handling.

Logistics and Support

• Packaging: Secure package measuring 25.9 x 20.8 x 5.5 cm with a weight of 0.991 kg.
• Shipping: We provide fast delivery via FedEx, UPS, or DHL.
• Lead Time: Orders are processed and dispatched within 24-48 hours.
• Warranty: This product includes a comprehensive 12-month quality warranty.

Global PLC Spare HUB's Insight

The Siemens 6ES5928-3UB12 remains a vital component for legacy automation infrastructure. Our technicians recommend this module for facilities running high-speed, interrupt-driven logic in heavy manufacturing. It pairs effectively with 923C coordinator modules to enhance processing capacity in distributed S5-155U architectures.

Frequently Asked Questions

• What are the differences between Reset and Restart?
  The Reset function clears all flags and timers and invokes OB 20, whereas Restart resumes program execution without clearing data.
• Is the PG interface available on other modules?
  Yes, the PG interface SI1 can be accessed directly on the CPU 928B or via the 923C coordinator module.
• How do I handle the boards during installation?
  The two PCBs are factory-linked. Never attempt to separate these boards to avoid damaging the circuitry.

Selection Guide

Verify your current S5 rack configuration before purchase. Ensure your existing backplane has at least 2 2/3 slots available for the CPU 928B. Confirm your power supply unit provides adequate current, specifically the 5A requirement at 5V. If utilizing multiprocessor features, ensure the coordinator module is compatible with the 6ES5928-3UB12 version.

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