Siemens PROFIBUS CP 1542-5 Manual page 28

Interrupts, diagnostics messages, error and system alarms
6.4 Standard diagnostics
Byte 1: Station status 2
Table 6- 4 Structure of station status byte 2
Bit no. Name
7 Deactivated
6 Reserved
5 Sync_Mode
4 Freeze_Mode
3 Watchdog_On
2 Status_From_Slave
1 Static_Diag
0 Parameter_Request
Byte 2: Station status 3
Table 6- 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.
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Explanation
The DP slave was identified as being not active in the local parameter record
and it is not polled cyclically.
- reserved -
The DP slave is in SYNC mode. The bit is set by the slave.
The DP slave is in FREEZE mode. The bit is set by the slave.
Watchdog monitoring is active on the DP slave. The bit is set by the slave.
Bit =1: The diagnostics information comes from the DP slave. The bit is set per-
manently to 1 by the slave.
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 -
Manual, 11/2014, C79000-G8976-C326-03
CP 1542-5