After the high water mark has been reached on a particular network connection, the low water mark represents the number of messages waiting to be sent at which normal operations will resume.
If this occurred on an I/O Server, on returning to the low water mark, the I/O server will send the latest value for tags whose values have changed since the high water mark was reached and then value updates will resume.
Note: If this parameter is set to a value greater than or equal to [LAN]HighWaterMark both of these parameters will be ignored and the system will operate at the default values.
1 to 2147483647
Default Value: 20000