Beckhoff TwinCAT 3 AL Status 0x001E after replacing a terminal, what to check?
I replaced an EtherCAT digital input terminal on my machine, and now the TwinCAT 3 runtime shows AL Status 0x001E. The system won't go into SAFEOP. What should I check first?
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 after a device replacement or modifications to process data. The system will enter SAFEOP with an error.
Likely causes and checks
1Configured device revision or ESI differs from the installed device
- Points to it
- The configuration in TwinCAT 3 does not match the actual hardware installed. This is common after replacing a device or updating its firmware.
- Check
- Compare the configured vendor, product code, and revision with the values found by an online scan in TwinCAT 3.
2Input process data edited to an unsupported combination
- Points to it
- The selected input process data objects (PDOs) for the device are not supported by its firmware or hardware capabilities.
- Check
- Restore the default PDO selection for the device and then re-apply only the options explicitly documented for that device.
Next check: Start by comparing the configured device revision and ESI with the actual device installed, as this is the most common cause after a device replacement. Use an online scan in TwinCAT 3 to verify the vendor, product code, and revision.
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