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Version 06
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3. Overview, functional description
Connection states, Table 1, 2 of 2
Connection to bus
Connection to MQL
system
State/cause
H1
Green LED
H2
Red LED
H3
Green LED
H4
Red LED
On
Flashes
Fault: Fieldbus coupler is ready to operate but is not addressed by the bus master or the
coniguration sent by the bus master does not match the coniguration of the MQL system.
This prevents start of the system if a unit that differs from the one conigured in the bus
master is connected.
Flashes
On
Fault: The parameters received from the bus master have a faulty format, e. g., wrong length
or inconsistent content. The data will not be passed on.
Off
On
Fault: ieldbus coupler receives no data from the bus during the monitoring time, e.g., be-
cause the data connection was interrupted. The monitoring time is set by the bus master
