KROHNE Summit 8800 Vol 3 - Manual (Page 133)

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08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 COMMUNICATION 08
For a Ethernet port set the following parameters:
Enable Click the box to enable modbus over TCP/IP
Port Ethernet port number
ID The modbus identifier for this link (1..255)
Name Any descriptive name to identify communication port
8 .4 .1 .2 Modbus timeout setting
In the settings, it is also possible to enable the modbus timeout to create an alarm when the
counter exceeds the number of seconds set under the general Modbus Timeout:
Figure 179 Modbus slave enable timeout
Check the box is the modbus timeout may be used. This setting refers to a general setting for
modbus timeout:
Figure 180 Modbus slave timeout settings
Modbus Communication is subject to 3 re-tries and a 1-second timeout on each re-try. If at the
end of this no reply or an invalid reply is received then an alarm appropriate to the failure is is-
sued. The Modbus time-out function is designed to identify when any essential Modbus master
or slave communication is lost.
To disable the timer, set the timeout value to -1 otherwise enter the maximum time that the
SUMMIT 8800 is allowed to be without Modbus communications. An accountable alarm will be
raised on every stream that is using the time-out alarm if communication loss occurs longer
than the defined time allowed. All Modbus received gas or liquid data will be flagged as an error.