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Diagnostics and maintenance
5.1 Diagnostics
Bit no.
Name
1
Static_Diag
0
Parameter_Request
Byte 2: Station status 3
Table 5- 4
Structure of station status byte 3
Bit no.
Name
7
Ext_Data_Overflow
6...0
Reserved
Byte 3: Master address
The address of the DP master that assigned parameters to this DP slave is entered in the
"Master_Add" byte.
If the DP slave did not have parameters assigned to it by any DP master, the DP slave sets the
address 255 in this byte.
Bytes 4 and 5: Vendor ID of the slave ("Ident_Number")
The vendor ID ("Ident_Number") for the DP slave type is entered in bytes 4 and 5. This
identifier can be used to identify the slave.
The more significant part of the value is in byte 5.
5.1.4
Device-specific diagnostics in DP-V1
There are two variants of device-specific diagnostics with DP-V1 slaves:
• Interrupt type
• Status type
The two variants differ from each other in the coding of byte 1, bit 7 of the device-specific
diagnostics data. The difference is component-specific.
Byte 0: Header
The two most significant bits have the value 00. This identifies the "module-specific
diagnostics data" block (see bytes 4...62) as a whole.
The remaining six bits indicate the length of the data field including byte 0.
34
Explanation
Static diagnostics
If the DP slave sets this bit, the DP master must fetch diagnostics data from the
DP slave until the DP slave resets the bit.
The DP slave sets this bit, for example when it is not capable of data transfer.
The DP slave sets this bit when it needs to have new parameters assigned and be
reconfigured.
If bit 0 and bit 1 are both set, bit 0 has the higher priority.
Explanation
If this bit is set, there is more diagnostics information available than indicated in
the diagnostics data. This data cannot be displayed.
- reserved -
Equipment Manual, 01/2023, C79000-G8976-C326-05
SIMATIC CP 1542-5
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