Siemens SINUMERIK 840Di sl Function Manual page 130

Signal Descriptions
DBX300.0 of the first modal synchronized action (ID=1/IDS=1) and
DBX307.7 of the 64th modal synchronized action (ID=64/IDS=64).
Note
Only the instance (NCK or PLC), which initiated a disable can cancel the disable again.
Signals from channel
With the following signals the channel shows the PLC application program for the
synchronized actions, which may be disabled by PLC:
DB21, ... DBX308.0 (disable synchronized action No. 1)
to
DB21, ... DBX315.7 (disable synchronized action No. 64)
where:
DBX308.0 of the first modal synchronized action (ID=1/IDS=1) and
DBX315.7 of the 64th modal synchronized action (ID=64/IDS=64).
Disable all synchronized actions
All modal/static synchronized actions, unless protected, are disabled by the global signal:
DB21, ... DBX1.2 (synchronized action off)
Disable selected synchronized actions
DB21, ... DBX280.1 (disable synchronized action)
Of the synchronized actions that can be disabled and that are marked in DB21, ... DBX308.0
(disable synchronized actions No. 1) to DB21, ... DBX315.7 (synchronized actions No. 64),
the actions identified in DB 21, ... DBX300.0 (disable synchronized actions No. 1) to DB21,
... DBX307.7 (synchronized actions No. 64) by the set bit as the ones that can be disabled
should only be disabled.
Synchronized actions disabled
DB21, ... DBX281.1 (disable synchronized action)
The required synchronized actions were confirmed by NCK as disabled.
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Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions