{"id":"ads-0x4","model_id":"0x4","name":"0x4 ERR_INSERTMAILBOX Mailbox Full","summary":"The ADS message could not be sent because the mailbox was full.","study_notes":[],"safety_notes":[],"sources":[{"url":"https://infosys.beckhoff.com/content/1033/tcadscommon/374277003.html","title":"ADS Return Codes","accessed":"2026-10-26"}],"verification":{"status":"source_checked","checked_at":"2026-10-26","values":4,"method":"llm_source_check"},"updated_at":"2026-10-26","type":"alarm","spec":{"code":"0x4","controllers":["beckhoff-twincat-3"],"meaning":"The mailbox was full, so the ADS message could not be sent.","remedy":"Reduce the number of ADS messages sent per cycle."},"url":"https://machineschema.com/alarm/ads-0x4","license":"https://creativecommons.org/licenses/by/4.0/"}