Fieldbus Coupler 750-341
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Fault behavior
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
3.1.10 Fault behavior
3.1.10.1 Fieldbus
failure
A field bus failure is given i. e. when the master cuts-out or the bus cable is
interrupted. A fault in the master can also lead to a fieldbus failure.
A field bus failure is indicated when the red "ERROR"-LED is illuminated.
If the watchdog is activated, the fieldbus coupler firmware evaluates the
watchdog-register in the case of fault free communication, and the coupler
answers all following MODBUS TCP/IP requests with the exception code
0x0004 (Slave Device Failure).
More information
For detailed information on the Watchdog register see Chapter "MODBUS
Functions"; "Watchdog (Fieldbus failure)".
3.1.10.2
Internal bus fault
An internal bus fault is created, for example, if an I/O module is removed. If
this fault occurs during operation the output modules behave in the same
manner as an I/O module stop. The "I/O" LED blinks red.
The coupler generates a fault message (fault code and fault argument).
After clearing the internal bus fault, restart the coupler by cycling the power.
The coupler starts up. The transfer of the process data is then resumed and the
node outputs are correspondingly set.
Содержание 750-341
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