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

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

63

Image 63

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

Contents

Warranty CopyrightTrademark Table of Contents @AADOData High/Low Alarm More Information Introduction Pin Assignment RevB1.0 7011/I-7011D Specifications 7011P/I-7011PD 7018P 7018 Block Diagram Wire Connection Page Default Setting Jumper SettingQuick Start Don’t Perform Calibrate Until You Really Understand Calibration Configuration 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 table RevB1.0 Type Input Range Data Format +F.S Zero Code Command Sec.2.19 ?AACHKcr Related CommandSyntax %AANNTTCCFFCHKcr AACHKcr Example Syntax #**CHKcr Syntax #AACHKcr #AA Response Valid Command DataCHKcr Invalid Command ?AACHKcr #AANSyntax #AANCHKcr Syntax $AA0CHKcr $AA0 Syntax $AA1CHKcr $AA1 FF data format of module reference Sec.1.10 Example $AA2Syntax $AA2CHKcr AATTCCFFCHKcr Syntax $AA3CHKcr $AA3 Data synchronized data, format reference Sec.1.10 Example $AA4Syntax $AA4CHKcr AASDataCHKcr Syntax $AA5VVCHKcr 10 $AA5VV 11 $AA6 Syntax $AA6CHKcrAAVVCHKcr 12 $AA8 Syntax $AA8CHKcrAAVCHKcr Syntax $AA8VCHKcr 13 $AA8V AA address of response module 00 to FF Example Related Command Sec.2.8 $AA314 $AA9Data Syntax $AA9DataCHKcr 15 $AAB Syntax $AABCHKcrAASCHKcr 16 $AAF Syntax $AAFCHKcrAADataCHKcr Syntax $AAMCHKcr 17 $AAM Syntax $AAZDataCHKcr 18 $AAZData Read address 01 module name, return 7018. Related Command 19 ~AAODataSyntax ~AAODataCHKcr 20 ~AAEV Syntax ~AAEVCHKcrRelated Topic Level. Example 21 @AADISyntax @AADICHKcr AASOOIICHKcr High 22 @AADOData Syntax @AAEATCHKcr 23 @AAEAT 24 @AAHIData 25 @AALOData Related Command Sec.2.23 @AAEAT Related Topic 26 @AADASyntax @AADACHKcr Syntax @AACACHKcr 27 @AACA Read 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 @AACE Response No response. Example 32 ~Description Host OK Syntax ~**CHKcr AASSCHKcr Host watchdog timeout flag, 0=Clear, 1=Set Example33 ~AA0 Syntax ~AA0CHKcr Syntax ~AA1CHKcr 34 ~AA1 Syntax ~AA2CHKcr 35 ~AA2 Syntax ~AA3EVVCHKcr 36 ~AA3EVV SS Safe Value, data format is same as PP Example 37 ~AA4Syntax ~AA4CHKcr AAPPSSCHKcr Syntax ~AA5PPSSCHKcr 38 ~AA5PPSS Module Status INIT* pin Operation Dual Watchdog = Module Watchdog + Host Watchdog Dual Watchdog OperationDigital Input and Event Counter Digital Output Thermocouple Measurement High/Low Alarm