Siemens 6MD662, Manual

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Redundant PROFIBUS DP interface
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SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
C53000-L1840-B011-03
RedSta Redundancy state of the PROFIBUS DP module:
Table 1-5 Redundancy states of a PROFIBUS DP slave interface
State Explanation
S_PRIMARY State during redundancy start-up (ref. to chap. 1.6).
The module can become the PRIMARY one and waits for the PRIMARY
state from the PROFIBUS DP master.
If the master does not send PRIMARY then the module state changes to
S_WAITING after expiring of Tsprimary (see below, RedTsp).
The partner module then changes to the S_PRIMARY state and is ready for
the time Tsprimary to become the PRIMARY one.
S_WAITING State during redundancy start-up (ref. to chap. 1.6).
The module waits for a telegram from the partner module via RedCom to
either become S_PRIMARY or BACKUP. If the PROFIBUS DP master of the
partner module became PRIMARY then the module changes to BACKUP af-
ter receiving the telegram, otherwise to S_PRIMARY.
BACKUP The PROFIBUS DP slave module can be in data exchange with the master
but there is no evaluation of output data from the master device.
PRIMARY The PROFIBUS DP slave module is in data exchange with the master and
receives the PRIMARY state from the master device.
All data in the output telegram from the master are evaluated and passed on
to the SIPROTEC device.
PB_Switchov State during redundancy switchover from PRIMARY to BACKUP.
The module shall change to BACKUP but the state PRIMARY is still
received from the master (e.g. if both master devices are PRIMARY).
PB_PartnAck State during redundancy switchover from PRIMARY to BACKUP.
The module shall change to BACKUP, has sent a Switchover.req telegram
(ref. to Table 1-7) via RedCom to the partner module and now is waiting for a
response (Switchover.cnf) from the partner module.
BP_Switchov State during redundancy switchover from BACKUP to PRIMARY.
The module shall change to PRIMARY but the state BACKUP is still
received from the master (e.g. if both master devices are BACKUP).
BP_PartnAck State during redundancy switchover from BACKUP to PRIMARY.
The module shall change to PRIMARY, has sent a Switchover.req telegram
(ref. to Table 1-7) via RedCom to the partner module and now is waiting for a
response (Switchover.cnf) from the partner module.
Note:
Output data and time synchronization messages from the master device are only
evaluated by the PROFIBUS DP slave in PRIMARY state.