Siemens SIMATIC S5 CPU 947 (part number 6ES5 947-3UA22) is a central processing unit designed for the S5-155U PLC system, offering robust performance for industrial automation applications.

Device Description

The CPU 947 serves as the central controller within the S5-155U PLC system, managing and executing user programs, processing inputs and outputs, and facilitating communication with other system components.

Technical Specifications

    Model Number: 6ES5 947-3UA22
    Memory: 128 KB internal memory for user programs and data
    Interface: 1 x 20 mA current loop interface (TTY) for OP/PG/PC (15-way Cannon socket)
    Compatibility: Designed for use with the S5-155U PLC system
    Dimensions: Approximately 10.0" x 1.0" x 8.0" (25.4 cm x 2.5 cm x 20.3 cm)
    Weight: Approximately 0.5 kg

Programming

Programming the CPU 947 is accomplished using Siemens' STEP 5 software, which allows for the development, testing, and debugging of user programs tailored to specific automation tasks.

Data Program Information

The CPU 947 manages data blocks and user programs within its 128 KB internal memory, providing sufficient space for complex automation processes.

Special Commands

The CPU 947 supports a comprehensive set of instructions, including logic operations, arithmetic functions, and data handling commands, enabling the execution of intricate control strategies.

Repair and Commissioning Recommendations

    Maintenance:
        Regularly inspect the CPU for signs of wear or damage.
        Ensure that firmware updates are applied as recommended by Siemens.

    Commissioning:
        Verify all connections and configurations before initiating the system.
        Conduct thorough testing of user programs in a controlled environment prior to full deployment.

Editor's Recommendations and Experiences

    Practical Tips:
        When upgrading or replacing the CPU, ensure compatibility with existing modules and peripherals to maintain system integrity.

    Reliability Advice:
        Maintain a clean operating environment to prevent dust accumulation, which can affect performance.

    Thermal Management:
        Ensure adequate ventilation around the CPU to prevent overheating, which can lead to system failures.

+ Siemens S5 PLC User Manual (pdf page)

+ Siemens 6ES5 947-3UA22 User Manual (pdf)

+ Siemens Automation Homepage >

+ Siemens Automation Contact (for Automation Mall)