10 monitoring – Lenze E84AYCPM User Manual
Page 82
Lenze · E84AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 5.0 EN · 11/2012 · TD17
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10
Monitoring
10.2
Short-time interruption of PROFIBUS communication
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
10.2
Short-time interruption of PROFIBUS communication
[10-1] DP states (Decentralized Peripherals) for short-time interruption of communication
The master detects the communication fault and, only after a few microseconds, transfers the slave
to the "WAIT_PRM" status of the DP state machine (see fig.
).
Only after the state chain of the DP state machine ending in the "Data_Exchange" state
(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 the 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 running if the slave does not reach the
"Data_Exchange" state due to repeated communication errors (e.g. caused by loose
contact).
Note!
Observe the following condition for the time setting:
Monitoring time for the data exchange (
)
≤
watchdog monitoring time of the
PROFIBUS (
).