Westermo FD-20 - Manual (Page 25)

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6.4.2.5.3 Global State Field
Click on the master symbol with the left mouse button.Then select the Online >
Global State Field menu. A display window opens in which the cyclic statuses of the
bus condition and the connected devices are shown.
Figure 16: Global state
The first row shows the main state of the master.This can have the condition
OPERATE or STOP. The next row shows individual bus errors. A current error
is shown in a red field.The meanings of the individual abbreviations are shown below.
TOUT Timeout error, the device has detected an expired supervision timeout caused
by rejected PROFIBUS telegrams.
NRDY Host not ready notification, indicates if the host program has set its state to
operative or not. If this bit is set the host program is not ready to communicate.
EVE Event error, the device has detected bus short circuits.The number of detected
events is stored in the bus statistic information variable.The bit will be set when
the first event is detected and will not be cleared.
FAT Fatal error, because of a serious bus error, no further bus communication is
possible.
NEXC Non exchange error, at least one slave has not reached the data exchange state
and no process data can be exchanged.