S5-95F Error Diagnosis and Elimination
15.3 System Event Data Block DB254
The system event data block (DB254) is subdivided into several sections. These sections are
shown in Table 15-1. Purpose, contents and characteristics of these sections are discussed in detail
in the following sections.
Table 15-1. Structure of the System Event DB
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Location in
the DB
Sections of the System Event DB (DB254)
DW 0 to 1 Product identification and system ID number
DW 2 to 33 Standard FBs loaded and their actual signature
DW 34 Group info for responses to errors
DW 35 to 36 Image of the passivated signal groups
DW 37 Image of the error groups
DW 38 to 55 Image for errors at inputs and outputs
DW 56 Image for SINEC L1 errors
DW 57 to 60 Unassigned
Error block counter and write pointer
Unassigned
Error entries with time stamp (a total of 16 error blocks of 8 data words
each)
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DW 61 to 62
DW 63
DW 64 to 191
15.3.1 System Identification and ID Number Entries
Product Identification
Data word DW 0 in the system event DB of each basic unit contains the product identification code
"095F
H
". You must not change this code.
System ID Number
If your system comprises several S5-95Fs, each with its own user program, it is conceivable that
the wrong EPROM submodule might inadvertantly be plugged into the wrong PLC. To prevent such
a problem, a unique system ID number can be assigned to each S5-95F. The system ID number
must be entered in DB1 when the system parameters are initialized.
In failsafe systems, the operating system reads the system ID number from DB1 and enters it into
data word DW1 of the system event DB. From this point on, the S5-95F accepts only EPROM
submodules with this system ID number. You can erase the ID number via a manual overall reset.
Safety Note
When using the system ID number as security measure, remember that
• The system ID number may not be zero
• An overall reset sets the system ID number to zero.
EWA 4NEB 812 6210-02
15-3
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