8 Maintenance and fault rectification8.1 MaintenanceWhen used in the correct way, no special maintenance is required innormal operation.8.2 Remove interferencesThe operator of the system is responsible for taken suitable measuresto remove interferences.A maximum of reliability is ensured. Nevertheless, faults can occurduring operation. These may be caused by the following, e.g.:l Sensorl Processl Power supplyl Signal processingThe first measures to be taken are to check the output signals as wellas to evaluate the error messages via the indicating and adjustmentmodule. The procedure is described below. Further comprehensivediagnostics can be carried out on a PC with the software PACTwareand the suitable DTM. In many cases, the causes can be determinedand faults rectified in this way.However, should these measures not be successful, call the VEGAservice hotline in urgent cases under the phone no. +49 1805 858550.The hotline is available to you 7 days a week round-the-clock. Sincewe offer this service world-wide, the support is only available in theEnglish language. The service is free of charge, only the standardtelephone costs will be charged.? When an additional instrument is connected, the segment fails.l Max. supply current of the segment coupler exceededà Measure the current consumption, reduce size of segment? Wrong presentation of the measured value in Simatic S5l Simatic S5 cannot interpret the number format IEEE of themeasured valueà Insert converting component from Siemens? In Simatic S7 the measured value is always presented as 0l Only four bytes are consistently loaded in the PLCà Use function component SFC 14 to load 5 bytes consistentlyReaction when malfunc-tions occurCauses of malfunctionRemove interferences24 hour service hotlineChecking Profibus PAVEGACAL 62 • Profibus PA 378 Maintenance and fault rectification30025-EN-090603