The alarm printout is printed out on the right side of the µR10000/µR20000 chart paper. There’s a triangle, number, letter, and another number, but what do they mean?

・△：Alarm occurred, ▽：Alarm cleared
・Channel number or tag
・Alarm type
・Level number
See "Recording/Viewing" > Description of printed out contents > Alarm printout in the operation guide, or section 1.4 “Recording" > “Printout" > Alarm printout in the user's manual.