Setup: Ignition server is version 7.6.3, Java OpenJDK version 1.7.0_45, running on Scientific Linux 6.4.
OPC UA is reading from 7 equipment units over Modbus/TCP.
One unit - Woodward easyGen-3000 randomly looses data quality from 192 to 0 or 600 after working well for several hours. This happens on easygen connected to a machine that is active. Other EasyGens are reporting idle machines’ data with good data quality.
In the OPC_UA-Devices configuration all devices are reported connected all the time. Working fix is opening edit window and save it once more. This “edit” fixes data quality to “good” (192).
Most of tags are acquired at 2 sec rate. In order to separate faulty one from others I tested scanclass timing 3, 5, 10 and 1.6 sec without success. Timeout was set in the range 3-10 sec.
It should be noted that the same problem was observed in various configurations: under Windows OS 64 bit, Linux Ubuntu, SL Linux, also reading remotely internet connected equipment and reading from local network.
Hope you vast experience help me to diagnose and find a fix for this problem.