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951-170-218-EN
Version 06
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3. Overview, functional description
Connection states, Table 1, 1 of 2
Connection to bus
Connection to MQL system
State/cause
H1
Green LED
H2
Red LED
H3
Green LED
H4
Red LED
Off
Off
Off
Off
Power supply not present
Flashes
Flashes
Flashes
Flashes
Fieldbus coupler is conducting self-test
Flashes
Off
Fieldbus coupler is waiting for the MQL system to send its coniguration data
(number of input/output bytes, number of parameter bytes, data transfer
rate, etc.).
On
Off
Connection to MQL system is operating normally
Off
Flashes
Error: can be resolved, e.g., connection to MQL system is down
Off
On
Error: cannot be resolved, e.g., faulty checksum in lash; the ieldbus coupler
must be replaced.
On
Off
Normal data communication (data exchange)