HEIDENHAIN TNC 620 User Manual page 169

Fundamentals, File Management | File management: Basics
File names
When you store programs, tables and texts as files, the control
adds an extension to the file name, separated by a point. This
extension indicates the file type.
File name File type
PROG20 .H
File names, drive names and directory names on the control
must comply with the following standard: The Open Group Base
Specifications Issue 6 IEEE Std 1003.1, 2004 Edition (POSIX
Standard).
The following characters are permitted:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g
h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 _ -
The following characters have special meanings:
Character Meaning
. The last period (dot) in a file name is the
extension separator
\
and / Directory separators
: Separates the drive name from the directory
Do not use any other characters. This helps to prevent file transfer
problems, etc. Table names must start with a letter.
The maximum permitted path length is 255 characters.
The path length consists of the drive characters,
the directory name and the file name, including the
extension.
Further information:
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017
"Paths", page 171
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