Siemens FM 458-1 DP Manual page 22

Communication blocks
I/O
EXT
For EXT=0, only the data/information at outputs Y01
to Y05 is updated.
For EXT=1, in addition, the information/data at outputs Y06 to
Y21 is updated.
OB The number of the appropriate SIMATIC S7 organizational block
(OB) is displayed at this output. In an error-free state, values 40,
55, 56, 57, 82, 83 and 86 are possible here. The actual value
depends on the process alarm configured in the HWConfig for the
particular alarm task.
STA Station address of the slave which had initiated the alarm. Values
of between 1 and 126 are valid values for this address.
SLO Slot of the module which initiated the alarm. Values of between 1
and 244 are valid values for the slot data.
SUB Sub-module of the module which initiated the alarm. Values of
between 1 and 31 are valid values for the sub-module data.
A value of 0 means no sub-module.
SBN Sub-network to which the module, which initiated the alarm, is
connected. Values of between 1 and 255 are valid values for the
sub-network data. The number for the sub-network can be taken
from the properties dialog box in NetPro or HY-Config.
YO1 The first 4 bytes with information about the last alarm event are
available at this output. The actual significance corresponds to
the first byte of the local data of the appropriate S7-OB.
As a whole, the local data comprise 20 bytes; the structuring of
the local data can be taken from the help for the appropriate OB.
YO2 The second 4 bytes with information about the last alarm event
are available at this output.
YO3 The third 4 bytes with information about the last alarm event are
available at this output.
YO4 The fourth 4 bytes with information about the last alarm event are
available at this output.
YO5 The fifth 4 bytes with information about the last alarm event are
available at this output.
Y06 You can obtain additional information/data about the alarm, which
to goes beyond the local data of the S7-OBs, at these outputs.
The information/data correspond to that which you would obtain if
Y21
you would have called the SFB54 "RALRM" within the appropriate
S7-OBs. The outputs are only updated if EXT=1 is set to 1.
Normally, these outputs are switched so that they are invisible,
and, when required, must be first made visible in the CFC, under
the tab "I/O".
QTS Block output QTS is used to display whether the block is
operating error-free (QTS = 1) or was de-activated after a
communications error message was entered (QTS = 0).
YTS Detailed status display for additional values at YTS,
refer to: D7-SYS Online Help "Help events".
(Press the F1 button in the CFC and call the topic "Help on
events" uncer "CFC for D7-SYS".)
2-10
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
(Default: 0)
Function Blocks - FM 458-1 DP
Edition 12.2004