Bronkhorst PROFIBUS-DP slave interface Manual de usuario descargar pdf (Pagina 22)

BRONKHORST®

7 SAFE STATE

If PROFIBUS communication problems occur, so when instrument is not in data exchange mode, the

instrument forces the valve (controllers only) into a safe state mode. This safe state depends on the

type of valve. NC valves will be closed, NO valves will be opened fully. The green and red Led on top of

the instrument indicates this mode by a short flash: 0.1 sec on, 2 sec off. As long as there is no data

exchange between master and slave the instrument will stay in this mode. It will leave this mode

automatically when data exchange starts. Via the RS232 communication interface it is possible to force

the instrument out of the safe state by changing the control mode to a value other than 0. At for

example control mode = 18 (RS232) or control mode = 1 (Analog input) the instrument will not get into

safe state.

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Bronkhorst PROFIBUS-DP slave interface Manual de usuario Pagina 22