Hach AMTAX sc User Manual

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Hach AMTAX sc User Manual Manual pdf 112 page image

112Fieldbus CommunicationsImportant Note: Do not try to change the listed register addresses, otherwise theinstrument may malfunction or become inoperable.The Fieldbus register contains FFFFh (65536dec) when the feature is disabled.A measurement series is initiated with entering "1" to register 40111 (Enter "2" for2-channel instruments to start measurements on channel 2). The register will return to "0"after the measurement series is done. The measurement results can be found at 40001(channel 1) and 40165 (channel 2).A value will appear every AVERAGE and at the end of a series if remind measurement(s)exist. Example: NUMBER OF MEAS is set to 5 and AVERAGE to 2. The result are 3values, the first is the average of measurement 1 and 2, the second is the average ofvalue 3 and 4, the last value is the reminding value of the 5th measurementNote: Internal processes like calibration and cleaning will be interrupted from a measurementseries.The interrupted process will start after the end of the measurement series. To use the STARTBY BUS feature, the sample has to be available for calibration, cleaning and rinsing purposes. Anongoing measurement series will not be interrupted by internal processes.B.3 External trigger contact, Control by external signalIf the controller board is equipped with an external input terminal (optional board version),measurements can be issued by applying an external DC voltage of 15V to 30V to theterminal for longer than 3 seconds. When the field bus control is activated, the input willissue a forced measurement as described within Fieldbus control.When the START BY BUS feature is activated, the external input will issue ameasurement series as described within the START BY BUS section.Note: Only measurements on channel 1 can be started with the external contact on 2 channelinstruments.B.4 Modbus register informationTable 13 Sensor Modbus registersTag name Register # Datatype Length R/W DiscreterangeMin/Maxrange DescriptionMEASURE VALUE 1 40001 Float 2 R — — Actual measurement value fromchannel oneLOCATION1 40005 String 8 R/W — — Name of LOCATION 1 (see menusystem)MEAS.UNITS 1 40013 UnsignedInteger 1 R/W 0/2 — Measurement units for channel 1;0=mg/L, 2=ppmCUVETTE TEMP. 40014 Float 2 R -50/99.99 Actual cuvette temperature in °CCALIB.INTERVAL 40016 UnsignedInteger 1 R/W 0/1/2/3/4 Calibration interval; 0=OFF,1=12h,2=24h, 3=36h, 4=48hCALIB.START 40017 UnsignedInteger 1 R/W0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23—Acceleration time for calibration(24 hour format) 0=0 o’clock to23=23 o’clockENCLOSURETEMP 40020 Float 2 R — -50/99.9 Temperature inside the analyzer