HEIDENHAIN TNC 426 PB/M Technical Manual page 666

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The log can also be written to by the PLC for diagnostic purposes:
7 7 7 7 With Module 9275 you can write ASCII data into the log.
7 7 7 7 With Module 9276 you can write the contents of the operands into the log.
Note
Do not use Modules 9275 and 9276 in the PLC program as shipped.
Instead, use it only for debugging. Otherwise the processing times could
be increased and the hard disk could be written to unnecessarily, so that
the log can no longer fulfill its function of recording keystrokes and error
messages.
Module 9275 Writing ASCII data into the log
With Module 9275 you can write ASCII data into the log. For later editing the
entry can be given an identifier.
Call:
PS B/W/D/K/S<Log entry>
–1: No entry
PS B/W/D/K/S<Log identifier>
–1: No entry
PS B/W/D/K <Priority>
0: Information
1: Warning
2: Error
CM 9275
Error recognition:
Marker Value Meaning
M4203 0 Entry was written
1 Error code in W1022
W1022 1 Invalid priority
2 Invalid string number or invalid immediate string
12 No string end identifier
20 Module was not called in a spawn job or submit job
HEIDENHAIN Technical Manual TNC 426, TNC 430