Interrupts, diagnostics messages, error and system alarms
6.4 Standard diagnostics
CM 1542-5
28
Manual, 11/2014, C79000-G8976-C290-02
Byte 1: Station status 2
Table 6- 4
Structure of station status byte 2
Bit no.
Name
Explanation
7
Deactivated
The DP slave was identified as being not active in the local parameter record
and it is not polled cyclically.
6
Reserved
- reserved -
5
Sync_Mode
The DP slave is in SYNC mode. The bit is set by the slave.
4
Freeze_Mode
The DP slave is in FREEZE mode. The bit is set by the slave.
3
Watchdog_On
Watchdog monitoring is active on the DP slave. The bit is set by the slave.
2
Status_From_Slave
Bit =1: The diagnostics information comes from the DP slave. The bit is set per-
manently to 1 by the slave.
1
Static_Diag
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.
0
Parameter_Request
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.
Byte 2: Station status 3
Table 6- 5
Structure of station status byte 3
Bit no.
Name
Explanation
7
Ext_Data_Overflow
If this bit is set, there is more diagnostics information available than indicated in
the diagnostics data. This data cannot be displayed.
6...0
Reserved
- 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.
