HEIDENHAIN ND 281 B v.2 - Manual (Page 42)

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Switching Outputs EXT (X41)
Switching signal for errors
The display unit permanently monitors functions such as
measuring signal, input frequency, and data output, and
displays an error message if it detects an error.
If errors occur that seriously influence measurement or data
output, the display unit activates a switching output. This
feature allows monitoring of automated processes.
ERROR xx Error