B&B Electronics I-7011 user manual High/Low Alarm, Thermocouple Measurement

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3.6 High/Low Alarm

Some analog input modules, like I-7011, equip with the high/low alarm function. When the alarm function is enabled, the digital output DO0 is the low alarm indicator, DO1 is the high alarm indicator, and the digital output command for changing digital out- puts DO0, DO1 is ignored. The alarm function is to compare the analog input value with given high alarm value and low alarm value. And there are two alarm types as follows :

zMomentary alarm : the alarm status is cleared while the analog input is not over the alarm value.

If Analog Input Value > High Alarm, DO1(High alarm) is on, else DO1 is off.

If Analog Input Value < Low Alarm, DO0(Low alarm) is on, else DO0 is off.

zLatch Alarm : the alarm is cleared only the user send com- mand to clear.

If Analog Input Value > High Alarm, DO1(High alarm) is on, else if Analog Input Value < Low Alarm, DO0(Low alarm) is on.

3.7 Thermocouple Measurement

When two wires composed of dissimilar metal are joined at one end and heated, the open circuit voltage is a function of the junction temperature and the composition of the two metals. All dissimilar metals exhibit this effect. The voltage is called “Seebeck voltage”. For small changes in temperature the Seebeck voltage is linearly proportional to temperature.

Rev:B1.0

I-7011, I-7018 User Manual

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Contents Warranty CopyrightTrademark Table of Contents @AADOData High/Low Alarm More Information IntroductionPin Assignment RevB1.0 7011/I-7011D Specifications7011P/I-7011PD 7018P 7018Block Diagram Wire Connection Page Default Setting Jumper SettingQuick Start Don’t Perform Calibrate Until You Really Understand CalibrationConfiguration Tables Baudrate Setting CC Analog Input Type Setting TTData Format Setting FF Type Input Range Data Format +F.S Zero Code Analog input type and data format tableRevB1.0 Type Input Range Data Format +F.S Zero Code Command Sec.2.19 ?AACHKcr Related CommandSyntax %AANNTTCCFFCHKcr AACHKcrExample Syntax #**CHKcrSyntax #AACHKcr #AAResponse Valid Command DataCHKcr Invalid Command ?AACHKcr #AANSyntax #AANCHKcr Syntax $AA0CHKcr $AA0Syntax $AA1CHKcr $AA1FF data format of module reference Sec.1.10 Example $AA2Syntax $AA2CHKcr AATTCCFFCHKcrSyntax $AA3CHKcr $AA3Data synchronized data, format reference Sec.1.10 Example $AA4Syntax $AA4CHKcr AASDataCHKcrSyntax $AA5VVCHKcr 10 $AA5VV11 $AA6 Syntax $AA6CHKcrAAVVCHKcr 12 $AA8 Syntax $AA8CHKcrAAVCHKcr Syntax $AA8VCHKcr 13 $AA8VAA address of response module 00 to FF Example Related Command Sec.2.8 $AA314 $AA9Data Syntax $AA9DataCHKcr15 $AAB Syntax $AABCHKcrAASCHKcr 16 $AAF Syntax $AAFCHKcrAADataCHKcr Syntax $AAMCHKcr 17 $AAMSyntax $AAZDataCHKcr 18 $AAZDataRead address 01 module name, return 7018. Related Command 19 ~AAODataSyntax ~AAODataCHKcr 20 ~AAEV Syntax ~AAEVCHKcrRelated Topic Level. Example 21 @AADISyntax @AADICHKcr AASOOIICHKcrHigh 22 @AADOData Syntax @AAEATCHKcr 23 @AAEAT24 @AAHIData 25 @AALOData Related Command Sec.2.23 @AAEAT Related Topic 26 @AADASyntax @AADACHKcr Syntax @AACACHKcr 27 @AACARead address 01 high alarm, return +2.5000. Related Command 28 @AARHSyntax @AARHCHKcr 29 @AARL Read address 01 event counter, return 1234. Related Command 30 @AARESyntax @AARECHKcr Syntax @AACECHKcr 31 @AACEResponse No response. Example 32 ~Description Host OK Syntax ~**CHKcrAASSCHKcr Host watchdog timeout flag, 0=Clear, 1=Set Example33 ~AA0 Syntax ~AA0CHKcrSyntax ~AA1CHKcr 34 ~AA1Syntax ~AA2CHKcr 35 ~AA2Syntax ~AA3EVVCHKcr 36 ~AA3EVVSS Safe Value, data format is same as PP Example 37 ~AA4Syntax ~AA4CHKcr AAPPSSCHKcrSyntax ~AA5PPSSCHKcr 38 ~AA5PPSSModule Status INIT* pin OperationDual Watchdog = Module Watchdog + Host Watchdog Dual Watchdog OperationDigital Input and Event Counter Digital OutputThermocouple Measurement High/Low Alarm