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vacon • 23 EtherNet/IP
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6.4.5 EtherNet/IP communication and connection timeout
The EtherNet/IP declares a watchdog the time within which both master and slave must send IO
back to each other. This watchdog time is a factor of the communication cycle time (cycle time x
timeout multiplier) and is set by the master. Minimum cycle time for VACON 100 EtherNet/IP is 4
milliseconds.
When an IO message is not received within the watchdog time, the timeout setting value is activated
and a fault is created after it elapses. This means that the panel parameter "Communication
timeout" (refer to chapter 4.2.4) is used as an additional timeout value. The same logic applies if a
connection is closed or the cable disconnects (link loss).
Figure 6. EtherNet/IP timeout logic with implicit connection (IO connection)
The explicit connections (TCP connection where PLC/user reads and writes data via CIP objects) will
generate fieldbus fault only if that connection has been used to write process data over Assembly,
Control Supervisor or AC/DC object. The explicit connection timeout is defined with TCP/IP Object's
attribute 13d "Encapsulation Inactivity Timeout".
We recommend that implicit connection is used for motor control and explicit connections for
"service data".
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