Commissioning (software)
5.9 Commissioning with PROFIBUS DP
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
5-81
Process data monitoring
Two parameters determine how process data are monitored:
● watchdog function on the PROFIBUS DP interface (standard slave function according to
PROFIBUS)
The watchdog function on the PROFIBUS DP interface is normally activated. It can be
deactivated by means of the PROFIBUS master configuring tool.
● Monitoring of the telegram failure time in the converter with parameter P2040
P2040 Telegram failure time
Parameter P2040 defines the time after which a fault will be generated (F0070) if no
telegram is received through the PROFIBUS DP interface.
● P2040 = 0 means: No monitoring
● P2040 > 0 means: The time in milliseconds after which a fault condition will be generated
if a setpoint telegram has not been received.
The fault conditions (F0070) is activated if no new setpoints are received by the
PROFIBUS DP interface within the telegram failure period.
Caution
Shutdown on faults can only take place if both monitoring functions are activated!
When the PROFIBUS DP interface is in operation, parameter P2040 should also be set to a
value of > 0. The process data monitoring function is thus activated/deactivated solely using
the PROFIBUS watchdog function. The monitoring time then corresponds to the watchdog
time setting plus the time set in P2040.
Note
Process data whose complete control word (PZD1) is set to zero are not transferred from the
PROFIBUS DP interface to the inverter.
Result: Alarm A0703 and possibly fault F0070.
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