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SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
C53000-L1840-B011-03
Red_State_1 / Red_State_2
7
6
5
Figure 1-9 Red_State_1 and Red_State_2 bytes
• Backup and Primary
During the redundancy start-up, these two bits remain '00' until the initial PRIMARY/
BACKUP decision has taken place (ref. to chap. 1.6.1).
Then, depending on the redundancy state of the slave interface, the bit "Primary" is
sent as '1' and "Backup" as '0' or vice versa.
A set bit for "Backup" means that the slave interface is neither in redundancy start-
up nor in the PRIMARY state. The module then is in one of the Backup states
(BACKUP, PB_Switchover, ...).
The value '1' will never be sent for the two bits at the same time.
• HW-Defect
If an error in the RedCom communication between the both PROFIBUS DP mod-
ules in the SIPROTEC device is recognized then this bit is set in the Red_State_2
byte. This also includes a failure of the partner module itself.
When this bit is set then all other bits in Red_State_2 are irrelevant.
• Data_Exchange
A set bit indicates that the slave interface is in data exchange with the PROFIBUS
DP master.
• Master_State_Clear
The bit has the value '1' if the PROFIBUS DP master sends Clear_Data.
• Baudrate found
The baud rate (data transmission rate) of the PROFIBUS DP master was recog-
nized.
Redundant PROFIBUS DP interface
4
3
2
1
0
Bit position
Meaning
27
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