638 Diagnosis, asset management and serviceVEGAPULS 61 • Modbus and Levelmaster protocol41361-EN-160224CodeText messageCause Rectification DevSpec State in CMD48M500Error with the reset deliv-ery status– With the reset to deliverystatus, the data couldnot be restored– Repeat reset– Load XML file with sen-sor data into the sensorBit 0 of Byte 14…24M501Error in the non-active lin-earization table– Hardware errorEEPROM– Exchanging the elec-tronics– Send instrument forrepairBit 1 of Byte 14…24M502Error in the diagnosismemory– Hardware errorEEPROM– Exchanging the elec-tronics– Send instrument forrepairBit 2 of Byte 14…24M503Meas. reliability too low– The echo/noise ratiois too small for reliablemeasurement– Check installation andprocess conditions– Clean the antenna– Change polarisationdirection– Use instrument withhigher sensitivityBit 3 of Byte 14…24M504Error on an device inter-face– Hardware defect – Check connections– Exchanging the elec-tronics– Send instrument forrepairBit 4 of Byte 14…24M505No echo available– Level echo can nolonger be detected– Clean the antenna– Use a more suitableantenna/sensor– Remove possible falseechoes– Optimize sensor positionand orientationBit 7 of Byte 14…248.4 Rectify faultsThe operator of the system is responsible for taking suitable meas-ures to rectify faults.The first measures are:• Evaluation of fault messages, for example via the display andadjustment module• Checking the output signal• Treatment of measurement errorsFurther comprehensive diagnostics options are available with a PCwith PACTware and the suitable DTM. In many cases, the reasons canbe determined in this way and faults rectified.The below tables show typical examples of application-related meas-urement errors with liquids. The measurement errors are differentiatedaccording to the following:Reaction when malfunc-tion occursProcedure for fault recti-ficationTreatment of measure-ment errors with liquids