Technical data

Table Of Contents
System Status Lists (SSL)
System Software for S7-300/400 System and Standard Functions - Volume 2/2
33-62
A5E00739858-01
33.30 SSL-ID W#16#xyA0 - Diagnostic Buffer
Purpose
If you read the partial list SSL-ID W#16#xyA0, you obtain the entries in the
diagnostic buffer of the module.
Note
S7-300-CPUs supply a maximum of 10 data records; S7-400-CPUs supply a
maximum of 21 data records.
Header
The header of partial list SSL-ID W#16#xyA0 is structured as follows:
Contents Meaning
SSL-ID The SSL-ID of the partial list extract:
W#16#00A0: All entries possible in the current mode
W#16#01A0: The most recent entries; you specify the number of most
recent entries with the INDEX parameter.
If the number of messages in the diagnostic buffer is
smaller than the configured maximum number of
messages, the SFC51 may provide invalid values using
this partial list extract. You therefore should avoid
a power loss which is not backed up!
W#16#0FA0: Only partial list header information
INDEX Only for SSL-ID W#16#01A0:
Number of most recent entries
LENTHDR W#16#0014: one data record is 10 words long (20 bytes)
N_DR Number of data records
Data Record
A data record of partial list SSL-ID W#16#xyA0 has the following structure:
Name Length Meaning
ID 1 word Event ID
info 5 words Information about the event and its consequences
time 4 words Time stamp of the event
Diagnostic Buffer
You obtain more information about the events in the diagnostic buffer using
STEP 7.