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1. “STT Has No Output?” – Often the Symptom, Not the Root Cause On a recent project, an STT temperature transmitter had already been wired into the PLC analogue input. During pre-commissioning, that channel showed: Temperature value fixed or not updating in the HMI 4–20 mA signal not within the expected range The first reaction on site was predictable: “The transmitter has no output. Is it faulty?” Instead of immediately replacing the device, we started at the   input . In ma