
2.DATA SERVER FUNCTIONS SPECIFICATION B-64014EN/03
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2.3 DETAILS OF THE BUFFER MODE
In the buffer mode, two areas (areas A and B) are prepared on the
memory card. While the NC program data stored in one area is being
supplied to the CNC, the subsequent NC program data is read in the
other area from the host computer using FTP transfer. When all data in
the former area has been supplied to the CNC, the data in the latter
area is supplied to the CNC. In the former area, which becomes empty,
the subsequent NC program data is read from the host computer using
FTP transfer.
Repeating this operation enables an NC program larger than the
capacity of the memory card to be handled. To use the buffer mode,
however, the original NC program must be divided into some files on
the host computer in advance.
The size of a divided file must be smaller than half the remaining
capacity of the memory card. If the size of a divided file is too large
(for example, 100 MB or more), it takes much time to read the first
file from the host computer and it also takes time until operation starts.
Using the buffer mode
In the buffer mode, a file (such as Oxxxx) called by DNC operation or
M198-based subprogram calling is a file list. The file list contains the
names of files to be called in the order in which they are to be called.
In the buffer mode, the Data Server sequentially calls the files
specified in the file list from the host computer and supplies data to
the CNC.
Contents
of Oxxxx
file1
file2
file3
file4
file5
Hard disk
get (FTP)
Program
call
Oxxxx
Oxxxx
file1
file2
file3
file4
file5
file1
file2
file3
file4
file5
Memory card
rea A
rea B
CNC Data Server Host computer