Beckhoff · EL1904 Digital Input Terminal
The EL1904 terminal has detected that its internal temperature has exceeded the maximum permissible value. This often indicates that the ambient temperature around the terminal is too high, leading to overheating. Prolonged operation in this state can reduce terminal lifespan or cause component failure.
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Measure the ambient temperature around the EL1904 terminal using a calibrated thermometer.
Compare the measured ambient temperature to the permissible operating temperature range specified in the terminal's technical data sheet.