Siemens Sinumerik 840D sl Programming Manual page 713

Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
14.10 Output to an external device/file (EXTOPEN, WRITE, EXTCLOSE)
Note:
For the logical device names "/dev/ext/1...9", "/
dev/v24" and "/dev/cyc/1...2" upper case/
lower case is ignored; upper case/lower case is
significant for specifying a path to a file. Only
uppercase letters are permissible for "LOCAL_DRIVE"
and "CYC_DRIVE".
Parameter 3: Processing mode for the WRITE
<processing
commands to this device/file
mode>:
Type:
Values: "SYN":
<usage mode>: Parameter 4: Usage mode for this device/file
Type:
Values: "SHARED": Device/file is requested in the
STRING
Synchronous writing
Program execution is stopped
until the write operation has been
completed.
Successfully completing the
synchronous write operation can
be checked by evaluating the
error variables of theWRITE
command.
Asynchronous writing
"ASYN":
Program execution is not
interrupted by the WRITE
command.
Note:
In this mode, the error variable of
the WRITE command does not
provide any information and
always has the value 0 (no error).
In this particular mode, there is no
certainty that the WRITE
command was successful.
STRING
"shared" mode. Other channels
can also use the device, i.e.
also open in this mode.
Device/file is exclusively used
"EXCL":
in the channel; no other
channel can use the device.
Additional functions
713