Lenze E94AYCPM - Manual (Page 79)

Lenze · E94AYCPM communication module (PROFIBUS®) · Communication Manual · DMS 12.0 EN · 11/2012 · TD17
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11 Monitoring
11.2 Short-time interruption of PROFIBUS communication
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11.2 Short-time interruption of PROFIBUS communication
From software version 01.21, the current DP states are displayed in C13868 / C14868.
[11-1] DP states (Decentralized Peripherals) for short-time interruption of communication
The master detects the communication fault and transfers the slave to the "WAIT_PRM" state of the
DP state machine after only a few microseconds (see Fig. [11-1] ).
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
An additional monitoring function for data exchange is available under
C13881 / C14881 . This
monitoring function already becomes active when the "Data_Exchange" state is exited and the
parameterised time (0 ... 65535 ms) has expired. The active monitoring function triggers the
response parameterised under C13880/1 / C14880/1 .
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" state due to repeated communication errors (e.g. caused by loose
contact).

Note!
Observe the following condition for the time setting:
Monitoring time for data exchange (
C13881 / C14881 )
≤
watchdog monitoring time of
PROFIBUS ( C13882/1 / C14882/1 ).