Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 169)

ASCII Character Sets D–3
Publication 2706-807
Cyrillic Character Set
The DL40 Plus Dataliner supports both Cyrillic and English alphabet
characters. The Cyrillic characters include the 32 standard Cyrillic
alphabetic characters. The English characters include the standard 26
English alphabet characters, numbers, and punctuation marks. Refer to
the Cyrillic character reference chart that follows for keycode
assignments.