Technical data

Linkage with PLC
CP 486 ⋅ 00/14 VIPA GmbH 123
6.3.2.6 File Names
Like already mentioned, file names can be specified as well with drive and/or path specification.
The CP486 software does not affect this. Directories are to be assigned, as usual, with a backslash
(ASCII-Code 92, 5C hex). The character can also be entered correctly with the PG. The maximum
length of a path specification is up to 64 characters. A file specification can consist of a maximum
of 2 characters for the disk drive specification, up to 64 characters for the path specification as well
as 8 characters for the file name and 3 characters for the extension, at the whole up to 78 characters.
Ist also possible to use a fixed form for a file name, consisting of 8 characters, a point, and 3
characters for the extension. If the file name is shorter than 8 characters or the extension shorter
than 3 characters, it is possible to preset the positions not used with blanks (ASCII-Code 32, 20
hex).
For MS-DOS system functions, which need a file name as parameter, the file name must be closed
up with the character ASCII zero (ASCII-code 0). For this reason the file name should be terminated
with character ASCII-zero when a file name is passed from the PC to the CP486. If the file name is
odd-numbered, this is unconditionally required. As the handling modules can enter only a block of
words into a bank, it is necessary to fill up the file name with ASCII zero to an even-numbered
length to achieve a block of words. If a file name is specified without terminating ASCII zero, the
CP software completes the missing zero.