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CHAPTER 5: SETTING UP EXPLICIT MESSAGING
Rung 1 in this example is incomplete. When the XIC for Read_Message.DN closes, the explicit data
read is available. Should the Explicit Message fail, the XIC for Read_Message.ER will close. In either
case, the typical ladder implementation will add additional logic to handle both successful and
unsuccessful communications.
The EtherNet/IP port is responsible for managing the TCP/IP communications of the explicit
messaging. According to Rockwell documentation the default unconnected timeout for an explicit
message is 30 seconds. This value may be changed by modifying the “UnconnectedTimeout”
member of the MESSAGE object. This timeout should not be lower than five seconds on an
optimally functioning network. Once an explicit message is initiated, it cannot be stopped.
Here are both rungs of the ladder in a single screen view.
IO4AB User’s Guide
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