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Question: WinCC OA is not allowing to achieve values with timestamps older than current system time (over MQTT).
31.03.2026 09:02
by
Rajat Patil
We have a tag that takes values from a MQTT Broker (OA is the subscriber). When the communication breaks between OA and broker, the broker buffers the published data (for the topic that we've subscribed to in OA). Upon reconnection the broker sends the data (along with the real time data simultaneously), but the data with timestamps older than current system time is marked as invalid and isn't even logged at the timestamp it was supposed to.
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