Cmmo-st-c5-1-diop Error Codes !new! Jun 2026

| Error Number (Hex) | Description | Causes & Remedies | Error Response (Default) | | :--- | :--- | :--- | :--- | | | Software error | An internal firmware error has been detected. Contact Festo Service. A software reset is required, but the error cannot be acknowledged directly. | A (Free run-out) | | 02h | Default parameter file invalid | The default parameter file is damaged. Reload the default parameter file via a firmware update. If the error persists, the internal memory may be faulty and the device may need replacement. | A (Free run-out) | | 05h | Zero angle determination | The rotor position could not be clearly identified, making the commutation point invalid. This can occur if the encoder cable is disconnected, the drive is blocked, the load is too high, or the axis is not stiff enough. Check the motor and encoder connection, ensure freedom of movement, and verify controller parameters. | A (Free run-out) | | 06h | Encoder error | An error occurred during evaluation of the encoder. The current position values may be incorrect. Check the encoder cable for breaks or incorrect pin assignment. Perform a software reset with a commutation angle search and homing procedure. | A (Free run-out) | | 0Dh | Overcurrent | A short circuit in the motor, motor cables, or brake chopper; a defective output stage; or incorrect parameterization of the current regulator. Check the motor and cables for short circuits. If the error occurs immediately on connection, the device may be defective. | Refer to manual | | 12h | Software limit negative | The setpoint position value has reached or exceeded the negative software limit switch. Check the target data and positioning area. The error can only be acknowledged if the drive is within the valid movement range. | A, B, C, E, F | | 13h | Positive direction locked | A limit switch error or software limit position error has occurred, blocking positioning in the positive direction. Check the target data and positioning area. | A, B, C, E, F | | 14h | Negative direction locked | A limit switch error or software limit position error has occurred, blocking positioning in the negative direction. Check the target data and positioning area. | A, B, C, E, F | | 15h | Output stage temperature exceeded | The permissible limit for the output stage temperature has been exceeded, possibly due to an overload. Check cylinder sizing, mechanics for sluggishness, and improve heat dissipation. The error can be acknowledged once the temperature returns to normal. | A, B, C, D | | 16h | Output stage temperature too low | The ambient temperature is below the permissible range. Increase the ambient temperature. The error can be acknowledged once the temperature is within range. | A, B, C, D | | 17h | Logic voltage exceeded | The logic power supply monitor has detected an overvoltage. This could be due to an internal defect or excessive supply voltage. Check the external supply voltage directly on the device. If the error persists after a reset, replace the device. | A, B | | 18h | Logic voltage too low | The logic power supply monitor has detected an undervoltage, possibly due to a short circuit or overload from connected peripherals. Disconnect peripherals and check. If the error persists after a reset, replace the device. | A | | 19h | CPU temperature exceeded | The monitor has detected a CPU temperature outside the permissible range. Check the ambient temperature. If the error persists, the device may have an internal defect. | A, B | | 22h | Homing unsuccessful | A homing run to a switch was unsuccessful, or a corresponding switch was not found. Check the homing method, the connection and parameterization of the homing switch, and cables for breaks. | B, C, E, F | | 23h | No index pulse found | Error during homing: no zero pulse was found. This could be due to a defective encoder or incorrect parameterization of the encoder resolution. Check the encoder's output signals and verify the resolution settings. | B, C, E, F | | 24h | Drive function not supported | A requested drive function is not supported in the current operating mode. Change the operating mode or select a different drive function. | E, F | | 25h | Path calculation error | The positioning target cannot be reached due to edge conditions. This can occur if the end velocity of a record is higher than the target velocity of the following record. Check the parameterization of the affected records. | A | | 27h | Save parameters error | An error occurred when writing to the internal permanent memory. Execute the last operation again, or check if another fault is present. If the fault persists, contact Festo Service. | G | | 28h | Homing required | A valid reference travel has not yet been conducted, or the drive is no longer referenced (e.g., due to a power failure). Perform a homing run. This error can also be parameterized as a warning. | B, C, D, E, F, G | | 29h | Target behind negative software limit | A positioning task was suppressed because the target lies behind the negative software limit. Check the target data and positioning area. | B, C, E, F | | 2Ah | Target behind positive software limit | A positioning task was suppressed because the target lies behind the positive software limit. Check the target data and positioning area. | B, C, E, F | | 2Bh | Firmware update invalid firmware | The firmware update could not be performed because the firmware version is incompatible with the hardware. Determine the hardware version and download the correct firmware from Festo. | A | | 2Dh | Motor 1²t warning | The warning limit of the 1²t integral has been reached. This is a warning that can be parameterized or suppressed as information. | Warning | | 2Eh | Index pulse too close to proximity sensor | The switching point of the proximity sensor is too close to the index pulse, which can prevent a reproducible reference position. Adjust the reference switches on the axis. | B, C, E, F | | 2Fh | Following error | The following error has become too great, which can occur during positioning and speed modes. Enlarge the error window, check for excessive acceleration/speed/jerk, or check for motor overload. | B, C, E, F | | 31h | CVE connection error | A connection error has occurred during "Control via Ethernet" (CVE). Check the connection, cable lengths, and shielding. | B, C, D, E, F, G | | 32h | FCT connection interrupted | The connection to the Festo Configuration Tool (FCT) has been interrupted. Check the connection and perform a reset if necessary. | B, C, D, E, F, G | | 33h | Output stage temperature warning | The temperature of the output stage has increased. This is a warning indicating that the output stage is approaching its limit. Check cylinder sizing and mechanics, and improve heat dissipation. | Warning | | 34h | Safe Torque Off (STO) requested | The "Safe Torque Off" safety function has been requested. This is a diagnostic message that can be parameterized as an error, warning, or information. Refer to the separate STO documentation for details. | 0 (No error response) | | 37h | Standstill monitoring | The actual position is outside the standstill window. This is a warning that the parameterization of the standstill window may be too narrow. | Warning | | 38h | Parameter file access blocked | During a parameter file procedure, all other reading and writing routines for the parameter file are blocked. Wait until the process is complete. Allow at least 3 seconds between parameter file downloads. | G | | 39h | Trace warning | An error has occurred during trace recording. This is a warning that can be parameterized. Start a new trace recording. | Warning | | 3Ah | Homing timeout | An error occurred during the homing process in controlled operation. A switch was not found within a specified time. Check the switch configuration and electrical connection. | B, C, E, F | | 3Bh | Homing method invalid | A homing error has occurred because a homing method block has been set. Select a permitted reference travel method. | E, F | | 3Ch | Two edges in one cycle | Two input signals have been set in one input read cycle. Program the PLC so that two records are not started in the same cycle. | B, C, E, F | | 3Dh | Start-up event | The device has been switched on or was switched on for longer than 48 days. This event is used for improved documentation of malfunctions. | Information | | 3Eh | Diagnostic memory error | An error has occurred when writing or reading from the diagnostic memory. The error can only be acknowledged after eliminating the cause. | G | | 3Fh | Record invalid | The started record is invalid because the record data is implausible or the record type is invalid. Check the parameters in the record. | B, C, D, E, F, G | | 40h | Last Teaching not successful | Teaching of the current positioning record is not possible. The current positioning record must be of the type "position record". | Warning |

: Overvoltage/undervoltage of the load or logic supply (24V DC $\pm$15%). Safety (STO) : Mismatches in the Safe Torque Off signals (pins STO1/STO2) or a detected cable break. Motor/Motion Faults cap I squared t cmmo-st-c5-1-diop error codes