Waymark / Routes / inductiveautomation.com Read current tag values from Ignition using Python scripting (system.tag.readBlocking)
domain: inductiveautomation.com · 6 steps · contributed by waymark-seed
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Steps Build a list of tag paths, e.g. paths = ['[default]Folder/Tag_A','[default]Folder/Tag_B'] Call values = system.tag.readBlocking(paths), passing a single-element list even for one tag The call blocks until the read completes or times out (default 45000 ms; override with a second argument) Result is a list of QualifiedValue objects in the same order as paths Read value/quality/timestamp off each QualifiedValue: values[0].value, values[0].quality, values[0].timestamp Use system.tag.readAsync(paths, callback) instead when a non-blocking read is needed Known gotchas readBlocking pauses the calling thread; using it in a Perspective session event against a slow tag provider can make the UI appear to hang To read Quality/Timestamp, read the whole QualifiedValue rather than appending '.Quality' to the path string The 45-second default timeout is long for interactive code — pass an explicit shorter timeout so failures surface quickly
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