4
Monitoring Functions
To ensure safe operation of the MOVITRAC
®
31.. inverter when in the fieldbus mode, additional
fieldbus monitoring functions were implemented which e.g. trigger a certain drive function in the
case of a bus error. The required drive response can be set by the user. The two fieldbus parameters
P571
Fieldbus Timeout
P572
Timeout Response
allow the user to program an application-dependent drive response in the case of a bus error.
4.1
Fieldbus Timeout
The
Fieldbus Timeout parameter determines the time after which the inverter is to respond to a bus
error. If the system no longer receives cyclic process data, it recognizes a bus error, caused e.g. by
a bus cable break. The drive must then automatically go into a safe state. The fieldbus timeout
parameter is useful for all bus systems, the
Timeout setting may, however, vary considerably for the
different fieldbus systems. The following table defines the range of values for the
Fieldbus Timeout
setting.
Parameter name:
Fieldbus Timeout
Unit:
Seconds [s]
Range:
0.01 s to 650.00 s in increments of 10 ms
Special case:
650.00 = Fieldbus timeout switched off
Factory setting:
0.5 s
After a factory setting has been carried out, the
Fieldbus Timeout parameter is set at 0.5 seconds!
IMPORTANT!
In the case of the PROFIBUS-DP parameter
571 Fieldbus Timeout is set only through the response
timeout, which is configured in the DP master for the complete DP system. Manual setting of this
parameter at the keypad or with the MC_SHELL user interface remains without effect, the setting
would be overwritten again at the next start-up of the PROFIBUS-DP.
4.2
Timeout Response
The fieldbus parameter
P572 Timeout Response determines the response of the inverter in the case
of a fieldbus timeout, i.e. the action the inverter is to trigger. The following table gives an overview
of possible inverter responses to a fieldbus timeout.
Fault response
RAPID STOP
Rapid stop with warning
EMERGENCY STOP
Emergency stop with warning
IMMEDIATE SWITCH-OFF
Immediate switch-off with warning
STOP/FAULT
Rapid stop with fault
EMERGENCY STOP/FAULT
Emergency stop with fault
IMMEDIATE SWITCH-OFF/FAULT
Immediate switch-off with fault
STANDARD MODE
Switch to standard mode
NO RESPONSE
No response
Monitoring Functions
4
42
MOVITRAC
®
31.. Fieldbus Unit Profile
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