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Byte 2: Station status 3
Table 5- 5
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 (big endian format).
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 6 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" field (see bytes 4... 62) as a whole.
The remaining six bits indicate the length of the data field including byte 0.
SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
Explanation
If this bit is set, there is more diagnostics information available than indicated in
the diagnostics data. This data cannot be displayed.
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Diagnostics and upkeep
5.1 Diagnostics
35
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