Rockwell Automation 2711 PanelView 550/900 Profibus Communications User Guide - Manual (Page 37)

PROFIBUS DP Communications 37
Publication 2711-6.3
The operation of the PanelView terminal during a network
connection failure depends upon the configuration of the PROFIBUS
Watchdog Timer.
Watchdog Enabled
If a non–zero watchdog timeout value has been set up then the
following actions will occur when the watchdog timer expires (even
if the network failure had been detected by the PanelView before the
timer expired):
1. Alert message 6 (watchdog timeout occurred) will be displayed.
2. In the Communications Setup screen the Comms Status LED will
flash, the Watchdog Enabled field will indicate ”No”, the
Watchdog Time field will show ”0 x 10ms”, and the Baud field
will show ”Not Found”.
When the connection between the DP Master and PanelView
terminal is re–established, then the alert message will be removed
without operator intervention.
Watchdog Disabled
If a zero watchdog timeout value has been set up then the following
actions will occur as soon as the network failure is detected:
1. Alert message 3 (DP Master no longer communicating with the
PanelView) will be displayed.
2. In the Communications Setup screen the Comms Status LED will
flash and the Baud field will show ”Not Found”.
When the connection between the DP Master and PanelView
terminal is re–established, then the alert message will be removed
without operator intervention.
Network Connection
Failures