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Error Diagnosis and Elimination
15.3.2 Standard FB and Signature
You, as user, may never modify standard function blocks. In order to make sure that they remain
unchanged, each standard FB has a signature.
The S5-95F enters the signatures of the first 16 standard FBs loaded into data words DW 2 to DW
33 of DB 254. You can check the identity of these FBs on the basis of these entries.
Data Word
DW 2
DW 3
DW 4
DW 5
:
:
:
DW 32
DW 33
An overall reset deletes all entries in data words DW 2 to DW 33.
15.3.3 Information on System Responses
The operating system enters the system response variants which occurred following an overall reset
in DR 34 (the low-order, or righthand, byte of data word DW 34). The entry corresponds to an
ORing of "byte 0" of all error blocks (refer to section 15.3.9).
First Data Byte (Byte 34)
7
6
5
4
3
15-4
Block number of the first FB loaded
Signature of the first FB loaded
Block number of the second FB loaded
Signature
Block number of the sixteenth FB loaded
Signature
System response to date
2
1
0
Hard STOP
Soft STOP
Response for a signal group as per the DB1 parameters
Flag
Error locations detected to date
Error in subunit B
Error in subunit A
Loaded Standard FB
S5-95F
EWA 4NEB 812 6210-02
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