![]() Reconnection will be attempted after Port Watch Time. Number of retries before abandoning transactions and putting the device offline. The minimum, maximum, mean and standard deviation of the last sixteen response times are displayed. The application timeout must be greater than (Port Timeout * (Port Retries + 1)). Maximum time to wait for an application confirmation or fragment. DNP3 Slave should use "Events" so that events will only be removed from the buffer when they are acknowledged. Request application confirmation when sending event data. Request application confirmation on multi-fragments or when sending event data. DNP3 Master should use "Never" because the same data will available on the next poll. Never request for application confirmation. Logging will slow down the data transfer rate. Do not enable this option if your TCP/IP RTU does not support Function Code 24 Use Record Current Time (Function Code 24) instead of Delay Measurement (Function Code 23) to synchronize time on the Slave. Turning on the Data Link confirm mode will slow down the data transfer rate.ĭata Link Confirmation mode is set to Never. Request Data Link confirmation on multi-frames only.ĭata Link confirm mode should be turned on when using unreliable media. The port.Timeout is used as the link layer timeout, the port.Retries is used as the link-layer retry. Disable link layer retry.Īlways request Data Link confirmation. Never request for Data Link confirmation. For use only when the underlying media have robust collision avoidance handling. When attaching multiple devices to a port, each device can access the port anytime without waiting for another device to finish. For multi-dropped devices when each device takes more than 30 seconds to start up. Put all devices attached to this port online at startup. If not blank, then restrict all file transfer activities in the slave to this directory. Only DNP3 slaves with this option enabled will respond to requests with self-address. The request link status will not be issued if the first message (comma- separated list of numbers terminated by \r\n) received on the connection identify any of the configured slaves. The DNP3 master will issue a request link status with self-address of 0xFFFC to identify the slave to be associated with this connection. The DNP3 Master or Slave can initiate the Time Synchronization procedure by writing 1 to. This ensures that the slave clock is synchronized before the event data are polled. Master device Application Layer Initial poll message.Ĭlass 1, 2, or 3 as configured and Class 0 polls. The OPC Quality flag of offline objects (online bit cleared or restart/communication lost bits not cleared). ![]() Each DNP3 Master with the same Master Station Address shares the same event buffer, that is filled from the main event buffer. The DNP3 slave will accept requests from any Master Station Address. Each DNP3 slave device can support multiple DNP3 masters with access to their independent event buffer. Instead of having to deal with many separate objects (static object, different variations of the event object, different variations of the output block). To simplify the interface for OPC clients, the OPC client can only have access to higher-level DNP3 static objects. The following documentation will only make sense if you have read the documentation published by the DNP Users group. Distributed Network Protocol is an open standard-based protocol maintained by the DNP Users Group ().
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