Communications timeout
The
Communications Timeout
area allows you to configure the FactoryTalk Batch
Server’s watchdog timer.The
Period (msec)
box allows you to set the watchdog timer setpoint in milliseconds.
When the timer expires, the FactoryTalk Batch
Server checks communication with the process-connected device’s data server and performs
the set/reset test on the data server watchdog timer. In the event of a failed conversation,
the server attempts to reconnect. The default is 10000
.The
Allowable Failures
box allows you to indicate how many Set/Reset retries the FactoryTalk Batch
Server should perform before it declares that conversation with the server is BAD and
issues a HOLD command. The default is 5
.
TIP:
The
recommended configuration
for Batch watchdog and PCD watchdog is that the PLC
watchdog timer setpoint must be configured to have a value that is 5 % or less
of
the total
value of the FactoryTalk Batch
Server watchdog timer’s period value and allowable failures value.Example:
If the server’s watchdog timeout period is set to 10000 milliseconds (10 seconds), and the allowable failures is set to 5, then set the PLC watchdog timer setpoint to 47500 milliseconds (47.5 seconds):
.95 (5 x 10000) = 47500
IMPORTANT:
When the watchdog times out in the PCD, the PLI should be designed to set the Phase Failure Tag to a nonzero value that represents an understandable message in the Phase Failure Enumeration Set such as
PCD1 Batch Watchdog Timed Out
.(See the for details on editing enumerations and enumeration sets.)
FactoryTalk Batch Equipment Editor
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