TwinCAT 3 troubleshooting answers
19 questions with answers cited from the manufacturer manuals.
- 0TwinCAT NC Error 0x4550 (17744) on an axis during acceleration, what to check?
The TwinCAT NC Error 0x4550 (17744) indicates that the position lag error exceeded the Maximum Position Lag Value for longer than the Maximum Position Lag Filter Time. This fault typically occurs during acceleration, at …
- 0TwinCAT NC Error 0x4260 (16992) Controller Enable: what to check first?
The TwinCAT NC Error 0x4260 (16992) indicates that the controller enable for an axis or coupled slave axis is not present. This can occur if the controller enable is withdrawn during active positioning or if a move is in…
- 0Beckhoff TwinCAT 3 EtherCAT slave stuck in INIT state, RUN LED off: what to check?
An EtherCAT slave stuck in the INIT state means it hasn't established basic communication or its identity doesn't match the configuration. This often happens after activating a new configuration or restarting TwinCAT. Th…
- 0Beckhoff TwinCAT 3: WcState = 1 on multiple slaves, what to check?
A Working Counter (WcState) error of 1 indicates invalid real-time communication for an EtherCAT slave. This means the master received an unexpected working counter value from a datagram, leading it to discard all input …
- 0Beckhoff TwinCAT 3 EtherCAT AL Status 0x0030, what to check first?
The EtherCAT AL Status 0x0030 fault, "Invalid DC SYNC Configuration," indicates that the distributed clock configuration is invalid for the application. This typically occurs during startup transitions (PREOP to SAFEOP o…
- 0Beckhoff TwinCAT 3: EtherCAT slave stuck in PREOP with AL Status 0x0024, why?
An EtherCAT slave reporting AL Status 0x0024 indicates an invalid input mapping, meaning the process data configuration (PDOs) in the TwinCAT 3 project does not match what the slave expects. This typically occurs during …
- 0Beckhoff TwinCAT 3 AL Status 0x001E after replacing a terminal, what to check?
AL Status 0x001E indicates an invalid input configuration, specifically for the SyncManager handling input process data. This fault typically occurs during EtherCAT startup when transitioning from PREOP to SAFEOP, often …
- 0Beckhoff TwinCAT 3: EtherCAT AL Status 0x001D, Invalid Output Configuration after replacing a slave, why?
The EtherCAT AL Status 0x001D indicates an invalid SyncManager configuration for output process data. This fault typically occurs during the transition from PREOP to SAFEOP at EtherCAT startup, or after a device replacem…
- 0Beckhoff TwinCAT 3: EtherCAT AL Status 0x001B Sync Manager Watchdog, what to check?
The EtherCAT AL Status 0x001B Sync Manager Watchdog fault indicates that a slave did not receive process data within the specified watchdog time, typically 100 ms. This usually occurs when cyclic process data stops, ofte…
- 0Beckhoff TwinCAT 3 EtherCAT AL Status 0x001A: what to check first?
The EtherCAT AL Status 0x001A Synchronization Error indicates that process data or synchronization events are arriving too late or out of step, causing the slave to return to SAFEOP. This fault is often seen in OP mode o…
- 0Beckhoff TwinCAT 3 EtherCAT AL Status 0x0011, what to check first?
The EtherCAT AL Status 0x0011 indicates an invalid requested state change, meaning the EtherCAT State Machine (ESM) refused a transition. This often happens during EtherCAT startup or when manually changing states in the…
- 0TwinCAT 3 XAR runtime ADS 1861 timeout, what to check first?
An ADS 1861 (0x745) timeout indicates that a request was sent to a remote terminal, but no response was received within the specified ADS timeout period. This often points to an issue with the remote terminal's configura…
- 0Beckhoff TwinCAT 3 ADS Error 1808: Symbol Not Found after PLC download, what to check?
ADS Error 1808 (0x710) indicates that the PLC runtime could not find a symbol name requested by a client (like an HMI or SCADA). This often occurs after a PLC download, especially if variables were renamed or removed. Th…
- 0TwinCAT 3 ADS Error 1798 (0x706) on EtherCAT master, what to check?
ADS Error 1798 (0x706), also known as ADSERR_DEVICE_INVALIDDATA, indicates that the server received a request with the correct size but rejected its content because the data values were invalid. This typically occurs dur…
- 0TwinCAT 3 ADS Error 1797 (0x705) on HMI read/write, what to check?
TwinCAT ADS Error 1797 (0x705), also known as ADSERR_DEVICE_INVALIDSIZE, indicates that the data length sent by an ADS client (like an HMI or SCADA) does not match the size expected by the TwinCAT server for a specific s…
- 0Beckhoff TwinCAT 3 ADS Error 1793: Service Not Supported, what to check?
ADS Error 1793 (0x701) indicates that the addressed ADS device received a request but does not support the specific command or index group. This differs from other ADS errors like 1794/1795, where the service exists but …
- 0Beckhoff TwinCAT 3 ADS Error 18 (0x12) after boot, why?
ADS Error 18 (0x12) indicates that a port is disabled because the TwinCAT system service is not running. This typically occurs right after a PC boot or if the TwinCAT runtime has stopped or failed to start. The error mea…
- 0TwinCAT 3 ADS Error 7: Target Machine Not Found, what to check?
ADS Error 7 (0x7) indicates that the local ADS router on your client machine (engineering PC or HMI) cannot find a route to the target's AMS NetId. This means the connection request never leaves your client. This often h…
- 0Beckhoff TwinCAT 3 ADS Error 6 after restart, what to check?
ADS Error 6 (0x6, ERR_TARGETPORTNOTFOUND) indicates that while the route to the target machine is functional, no ADS server is listening on the specific AMS port the client is trying to address. This often occurs after a…