Hach AMTAX sc User Manual

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Hach AMTAX sc User Manual Manual pdf 111 page image

111Appendix B Fieldbus CommunicationsFor general information about Fieldbus control, refer to the appropriate controller manualsand to the register list (Table 13, page 112). A configuration file is needed for the use withan OPC server. Contact the manufacturer for further information.B.1 Fieldbus controlTo start the Fieldbus control selectMAINTENANCE>TEST/MAINT>FIELDBUS>ENABLED.Note: For safety reasons, the Fieldbus control is temporarily disabled when the AMTAX sc analyzeris set to the service state in the menu system. To enable the Fieldbus control , select START in theSERVICE menu.When the service state of the instrument is activated through the Fieldbus, the Fieldbuscontrol remains active.Important Note: Before starting Fieldbus communications, make sure that no person isworking on the analyzer.The Fieldbus control registers (40048 to 40058) will be set to FFFFh (65635dec) if theFieldbus is disabled.To initiate an action, enter "1" to the register for the required action (40049 to 40058), thenenter "1" to the control register 40048. The requested action is accepted when bothregisters return to "0". When the instrument is waiting between measurements (longmeasuring intervals) a measurement can be forced by entering "1" to register 40049 and40048. The measurement will be initiated in 5 minutes.Note: Ongoing internal processes like calibration and cleaning are interrupted by a forcedmeasurement. The interrupted process will be started again after the forced measurement. Adischarged value will be discarded before the measurement. A forced measurement during acalibration process may have higher deviations from the true value than during a normal operation.Internal processes like calibration and cleaning do not interrupt a measurement.Important Note: Do not change the listed register addresses or other values, otherwisethe instrument may malfunction or become inoperable.B.2 Remote controlled measurement seriesTo take a remote controlled measurement series (no automatic measurement with fixedinterval) start the following procedure.1. Select MAINTENANCE>TEST/MAINT>FIELDBUS>ENABLED to enable the STARTBY BUS feature.2. Select CONFIGURE>MEASURING>START BY BUS>YES.Refer to menu system for other options. It is recommended to set AVERAGE either to"1" or to an even divider of NUMBER OF MEAS or to the same number as NUMBEROF MEAS to avoid measurements which are not averaged.Note: For safety reasons, the Fieldbus control and START BY BUS are temporarily disabled whenthe AMTAX sc analyzer is set to the service state in the menu system. To enable START BY BUSselect MAINTENANCE>TEST/MAINT>START.When the service state of the instrument is activated through the Fieldbus, the Fieldbuscontrol remains active.Important Note: Before starting Fieldbus communications, make sure that no person isworking on the analyzer.