Siemens SINUMERIK 840D sl Programming Manual page 609

16.9 Process DataShare - output to an external device/file (EXTOPEN, WRITE, EXTCLOSE)
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Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
:
<usage mode>
:
<write mode>
Values: : Synchronous writing
"SYN"
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 the
command.
: Asynchronous writing
"ASYN"
Program execution is not
interrupted by the
command.
Note:
In this mode, the error variable
of the
provide any information and
always has the value 0 (no
error). In this particular mode,
there is no certainty that the
WRITE
Parameter 4: Usage mode for this device/file
Type: STRING
Values: : Device/file is requested in the
"SHARED"
"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.
Parameter 5: Write mode for the WRITE
commands to this file/device (optional)
Type: STRING
Values: : Attaching
"APP"
The file is always kept regarding
its contents; write calls are
attached at the end.
: Overwrite
"OVR"
The contents of the file are
deleted and re-generated using
the subsequent write calls.
Note:
Using this parameter, the write mode configured in
the extdev.ini file cannot be overwritten. In the
case of a conflict, then the EXTOPEN call is
acknowledged with error.
Additional functions
WRITE
WRITE
command does not
WRITE
command was successful.
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