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Expert Siemens PLC & Control System Repair Services

Is a malfunctioning Siemens PLC or control system component causing disruptions in your automation system? ROC Industrial specializes in the repair of Siemens PLCs, including the SIMATIC S7-1200, S7-1500, S7-300, S7-400, and LOGO! series. We offer a fast, reliable, and cost-effective alternative to replacement, minimizing downtime and getting your equipment back in operation quickly. Our technicians are highly experienced in diagnosing and repairing a wide range of Siemens PLC issues.


About Siemens PLCs


Siemens is a global leader in industrial automation, and their SIMATIC PLC family is one of the most widely used in the world. From small, modular LOGO! controllers to powerful S7-1500 systems, Siemens PLCs are known for their reliability, flexibility, and integration with the TIA Portal engineering framework.


Siemens PLC Models We Repair


  • SIMATIC S7-1500:CPU 1511-1 PN, CPU 1513-1 PN, CPU 1515-2 PN, CPU 1516-3 PN/DP, CPU 1518-4 PN/DP, CPU 1510SP-1 PN, CPU 1512SP-1 PN, CPU 1516T-3 PN/DP, CPU 1517TF-3 PN/DP

  • SIMATIC S7-1200:CPU 1211C, CPU 1212C, CPU 1214C, CPU 1215C, CPU 1217C, CPU 1212FC, CPU 1214FC, CPU 1215FC

  • SIMATIC S7-300:CPU 312, CPU 314, CPU 315-2 DP, CPU 315-2 PN/DP, CPU 317-2 PN/DP, CPU 319-3 PN/DP, CPU 312C, CPU 313C, CPU 314C-2 DP, CPU 314C-2 PN/DP

  • SIMATIC S7-400:CPU 412-1, CPU 412-2, CPU 414-2, CPU 414-3, CPU 416-2, CPU 416-3, CPU 417-4, CPU 414H, CPU 416H

  • LOGO! Logic Modules:LOGO! 8, LOGO! 7, LOGO! 6, LOGO! 8.3, LOGO! 8.FS4

  • Older SIMATIC PLCs:SIMATIC S7-200 (CPU 221, CPU 222, CPU 224, CPU 224XP, CPU 226)
    SIMATIC S5 (S5-90U, S5-95U, S5-100U, S5-115U, S5-135U, S5-155U

  • SIMATIC ET 200SP, ET 200S, ET 200MP, ET 200pro, ET 200eco, ET 200iSP (Distributed I/O Systems - including repair of the CPU/interface modules)

  • Other Siemens Control System Components


Common Siemens PLC Problems We Solve


  • Processor Faults: CPU failures, memory errors, STOP mode issues.

  • I/O Module Failures: Faulty input or output modules.

  • Communication Problems: Issues with PROFIBUS, PROFINET, Ethernet/IP, or other communication protocols.

  • Power Supply Issues: PLC won't power on, intermittent power.

  • Programming Errors: While we don't typically fix programming errors, we can often identify them as the source of a problem.

  • Component Failures: Failure of internal electronic components.

  • Battery Problems


Common Siemens PLC Fault Codes/Indicators We Fix


Our technicians are experienced in diagnosing and resolving a wide range of Siemens PLC fault codes and indicator lights, including (but not limited to) the following:


  • SF (System Fault) LED: Indicates a general system fault.

  • BF (Bus Fault) LED: Indicates a problem with the communication bus (PROFIBUS, PROFINET).

  • MAINT (Maintenance) LED: Indicates a maintenance request or warning.

  • STOP LED: Indicates the PLC is in STOP mode.

  • Specific Fault Codes (displayed on a PG/PC or HMI): OB80 (Time Error), OB82 (Diagnostic Interrupt), OB86 (Rack Failure), OB121 (Programming Error), OB122 (I/O Access Error).

  • I/O Module Fault LEDs: Indicators on specific I/O modules.

  • Battery Light


Don't see your specific fault code or indicator? Don't worry! We can still diagnose and repair your Siemens PLC. Contact us with the fault information and PLC model for a free evaluation.


Our Siemens PLC Repair Process

  1. Free Evaluation & Quote: Describe the problem, including any fault codes or indicators, and your Siemens PLC model. We provide a free, no-obligation quote.

  2. Shipping: Ship the PLC or control system component to our facility.

  3. Diagnosis & Repair: Our technicians use specialized diagnostic equipment, including Siemens software (STEP 7, TIA Portal) and hardware, to pinpoint the fault and perform expert repairs.

  4. Testing & Quality Assurance: We thoroughly test the repaired PLC, often using a dedicated test system with compatible I/O modules and simulation software (PLCSIM), to ensure it meets original performance specifications.

  5. Fast Turnaround: Minimize downtime.

  6. Warranty: We offer a comprehensive warranty on all Siemens PLC repairs.


Why Choose ROC Industrial for Siemens PLC Repair?


  • Expert Technicians: Our team has extensive experience specifically with Siemens PLCs and automation systems.

  • Siemens-Specific Diagnostic Tools: We use specialized software (STEP 7, TIA Portal) and hardware for accurate diagnosis.

  • Genuine or Equivalent Parts: We use high-quality replacement parts.

  • Fast Turnaround Times: Minimize downtime.

  • Cost-Effective Solutions: Repair is often much cheaper than replacement.

  • Comprehensive Warranty: We stand behind our work.


Get Your Siemens PLC Repaired Today!


Contact ROC Industrial for a free quote and expert repair services.

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