2 short interruption of profibus communication, Short interruption of profibus communication, Communication manual 8400 protec profibus – Lenze E84Dxxxx User Manual
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Communication manual 8400 protec PROFIBUS
Monitorings
Short interruption of PROFIBUS communication
65
L
EDS84DPBUS EN 2.0 - 09/2010
10.2
Short interruption of PROFIBUS communication
[10-1] Sequence for short-time interruption of communication
The master detects the communication fault and only after a few microseconds it transfers
the slave to the "WAIT_PRM" status of the DP state machine (see illustration
).
Only after the state chain of the DP state machine ending in the "DATA_EXCHANGE" status
(DATA_EXCH) has been passed through, the watchdog monitoring time calculated for the
slave (in milliseconds) continues to run.
Additional monitoring for the data exchange
For this reason an additional monitoring function for data exchange is available with
which is activated when "Data_Exchange" is exited and the parameterised time
(0 ... 65535 ms) has expired. The active monitoring triggers the response parameterised in
.
2133PFB006
POWER ON
WAIT_PRM
WAIT_CFG
DATA_EXCH
Slave_Diag
Get_Cfg
Set_Slave_Add
Slave_Diag
Chk_Cfg, not o.k.
Set_Prm, not o.k.
Chk_Cfg, o.k.
Slave_Diag
Set_Prm
Get_Cfg
Note!
The watchdog monitoring time does not continue to run when the slave does
not reach the "DATA_EXCHANGE" status due to repeated communication faults
(e.g. caused by loose contact).
Note!
Meet the following condition for the time setting:
Monitoring time for the data exchange (
)
≤
Watchdog monitoring time
).