Structure Of Diagnostic Data, Bytes 20 And 21; Assignment Of Asi Address To Bit Positions, Bytes 22 To 25 - Siemens SIMATIC Distributed I/O System DP/ASi Link Manual

Table 8-15 Structure of diagnostic data, bytes 20 and 21, continued
1
Byte Meaning
21.1 Configuration error:
configured ASi slaves not
present
21.2 ID code or I/O code of an
ASi slave erroneous
(occurs only during start-up)
21.3 Internal DP/ASi error
21.4 ASi slave present with ad-
dress "0"
21.5 EEPROM of DP/ASi link de-
fective
1
Unnamed bits are without significance.
ASi slave diagno- The failure of an ASi slave is indicated by diagnostic bytes 22 to 25.
sis
Byte 22.0 is not assigned. In Table 8-16 you can see the assignment of the
different bits to the ASi address.
Defective ASi slaves are marked with a "1".
Table 8-16
22
23
24
25
1
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
Reason/Reaction
"Actual is equal to setpoint config-
uration":
data exchange cannot take place
on PROFIBUS-DP side.
"Actual is less than setpoint con-
figuration" and operation:
data exchange is possible
The ID code or the I/O code of an
existing ASi slave does not corre-
spond to the data in the parameter-
ization message.
Parameterization data not present.
You have included an ASi slave
having an address of "0" in the
ASi.
An internal self-test has deter-
mined that the EEPROM is defec-
tive.

Assignment of ASi address to bit positions, bytes 22 to 25

Byte Bit (Corresponds to ASi Address)
7 6 5
7 6 5
15 14 13
23 22 21
31 30 29
This position is not assigned. An ASi slave with ASi address 0 is indicated by byte 21.4.
Diagnostics and Error Handling
Remedy
Add the missing ASi slaves.
Check whether a different slave
(different ID or I/O code) from that
specified in the parameterization
message is being used.
Check whether the parameteriza-
tion and configuration messages
are present in your DP master.
Modify the ASi address on the ASi
slave.
If byte 20.4 is set simultaneously,
the correct ASi address is set auto-
matically.
Consult your point of contact at
Siemens.
4 3 2 1
4 3 2 1
12 11 10 9
20 19 18 17
28 27 26 25
0
1
–
8
16
24
8-19