HEIDENHAIN TNC 335 Technical Manual - Manual (Page 521)

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TNC 360 2 TNC data interfaces 8/95
2.3 Data interface functions
The data interfaces on the TNC can be used to save data and files and read them back in again, to
output programs to external devices (e.g. printers), to read in programs and simultaneously execute
them and to carry out data transfer (communication) between TNCs.
2.3.1 Saving/reading files
The following table lists all the files which can be saved to external memory (floppy disk unit,
magnetic tape unit and PC) and can be read back in from them.
File Identification
HEIDENHAIN-dialog NC program H
ISO NC program D
Machine parameters M
Correction table S
PLC program P
After the appropriate key numbers for the PLC, the machine parameters and the correction table
have been entered, these files can be written-to or read-from via the data interfaces.
Data transfer is initiated with the EXT key as usual.
Current values of Q parameters, PLC error messages and dialogs can also be outputted via the two
interfaces (NC program: FN 15: PRINT).
The magnetic tape unit is only suitable as an external data carrier to a limited extent, because only
one file can be stored per cassette side. However, this file can contain several programs.
Using the floppy disk unit, up to 256 programs (approximately 25,000 program blocks) can be
stored. This represents a storage capacity of approximately 790 kilobytes.
When transmitting and receiving a file the appropriate code file is outputted and read in again
complete with a Block Check Character (BCC).
If the file is stored in an external computer using HEIDENHAIN's TNC.EXE data transfer software, a
new file extension is generated. This extension consists of the code and the letters NC.
Example:
If a ISO program is stored, it is given the file extension *.DNC.