CPU Malfunction. Indicates a fault on the controller motherboard.
The input signal received is higher or lower than the programmed maximum/minimum limits.
Solution: Re-flash the system firmware or replace the compact flash memory unit. 2. Debugging and Compatibility Errors (F21 to F23)
Password Error. Invalid or missing password for protected parameters. ⚙️ Hardware & Drive Faults
The amplifier detects an incomplete circuit to the proportional solenoid. No current is flowing despite a command signal being present. rexroth ppcr221 fault codes full
Fiber optic transmission drop or physical loop breakage.
Check the drives (e.g., DIAX or IndraDrive) for accompanying fault codes.
When the control voltage is first applied, the PPC-R22.1 runs internal hardware checks. If it halts on one of these codes without reaching standard application execution, use this breakdown: Error / State Display Technical Meaning Diagnostic & Repair Actions CPU Self-Test & Internal Memory Verification
If a critical internal fault occurs, you may need to power down the 24V supply to the module, wait 10 seconds, and power it back up. CPU Malfunction
Cause : The onboard lithium buffer battery protecting parameters and zero-points is fading.
Understanding Rexroth PPC Alphanumeric Diagnostic Structures
Look at the diagnostic LED on the front of the PPC-R22.1.
Cause : Internal software execution looped or hung due to firmware processing exceptions. Solution: Re-flash the system firmware or replace the
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If the controller stops at any of these negative numbers during power-up, it indicates a hardware or initialization failure. Common Cause / Solution to -07 CPU Initialization CPU or RAM test failed. Replace control unit. -08 CPU Malfunction Often indicates a motherboard or processor failure. -10 to -2X System Startup Problem loading the operating system from the CF card. E1 Processor Fault
A: Yes. Send a control word bit (typically bit 7 of STW) via Profisafe or Modbus. But local reset is safer.
The Rexroth PPCR221 fault codes provide a valuable diagnostic tool for troubleshooting and maintaining the PLC and the systems it controls. By understanding the different categories of fault codes and common codes, users can quickly identify and address issues, minimizing downtime and optimizing system performance. By following a structured troubleshooting procedure and consulting the user manual and documentation, users can efficiently resolve faults and ensure reliable operation of the Rexroth PPCR221 PLC.