B&B Electronics I-7011 Dual Watchdog Operation, Digital Input and Event Counter, Digital Output

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3.3 Dual Watchdog Operation

Dual Watchdog = Module Watchdog + Host Watchdog

The Module Watchdog is a hardware reset circuit to moni- tor the module’s operating status. While working in harsh or noisy environment, the module may be down by the external signal. The circuit may let the module to work continues and never halt.

The Host Watchdog is a software function to monitor the host’s operating status. Its purpose is to prevent the network/com- munication from problem or host halt. While the timeout occurred, the module will turn the all output into safe state to prevent from unexpected problem of controlled target.

The I-7000 module with Dual Watchdog may let the con- trol system more reliable and stable.

3.4 Digital Input and Event Counter

The digital input DI0 may work as event counter. The counter updates while the input changes from high level to low level. The counter is 16-bit width and useful for low speed count, frequency is lower than 50Hz.

3.5 Digital Output

When the module power on, the host watchdog timeout flag is checked first. If the status is set, the digital outputs (DO0 and DO1) of module will set to Safe Value. If the flag is clear, the digital outputs will set to PowerOn Value.

If the host watchdog timeout flag is set, the module will ignore the digital output command @AADO(Data).

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I-7011, I-7018 User Manual

Rev:B1.0

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Contents Trademark WarrantyCopyright Table of Contents @AADOData High/Low Alarm Introduction More InformationPin Assignment RevB1.0 Specifications 7011/I-7011D7011P/I-7011PD 7018 7018PBlock Diagram Wire Connection Page Quick Start Default SettingJumper Setting Calibration Don’t Perform Calibrate Until You Really UnderstandData Format Setting FF Configuration TablesBaudrate Setting CC Analog Input Type Setting TT Analog input type and data format table Type Input Range Data Format +F.S Zero CodeRevB1.0 Type Input Range Data Format +F.S Zero Code Command Sec.2.19 AACHKcr Related CommandSyntax %AANNTTCCFFCHKcr ?AACHKcrSyntax #**CHKcr Example#AA Syntax #AACHKcrSyntax #AANCHKcr Response Valid Command DataCHKcr Invalid Command ?AACHKcr#AAN $AA0 Syntax $AA0CHKcr$AA1 Syntax $AA1CHKcrAATTCCFFCHKcr $AA2Syntax $AA2CHKcr FF data format of module reference Sec.1.10 Example$AA3 Syntax $AA3CHKcrAASDataCHKcr $AA4Syntax $AA4CHKcr Data synchronized data, format reference Sec.1.10 Example10 $AA5VV Syntax $AA5VVCHKcrAAVVCHKcr 11 $AA6Syntax $AA6CHKcr AAVCHKcr 12 $AA8Syntax $AA8CHKcr 13 $AA8V Syntax $AA8VCHKcrSyntax $AA9DataCHKcr Related Command Sec.2.8 $AA314 $AA9Data AA address of response module 00 to FF ExampleAASCHKcr 15 $AABSyntax $AABCHKcr AADataCHKcr 16 $AAFSyntax $AAFCHKcr 17 $AAM Syntax $AAMCHKcr18 $AAZData Syntax $AAZDataCHKcrSyntax ~AAODataCHKcr Read address 01 module name, return 7018. Related Command19 ~AAOData Related Topic 20 ~AAEVSyntax ~AAEVCHKcr AASOOIICHKcr 21 @AADISyntax @AADICHKcr Level. ExampleHigh 22 @AADOData 23 @AAEAT Syntax @AAEATCHKcr24 @AAHIData 25 @AALOData Syntax @AADACHKcr Related Command Sec.2.23 @AAEAT Related Topic26 @AADA 27 @AACA Syntax @AACACHKcrSyntax @AARHCHKcr Read address 01 high alarm, return +2.5000. Related Command28 @AARH 29 @AARL Syntax @AARECHKcr Read address 01 event counter, return 1234. Related Command30 @AARE 31 @AACE Syntax @AACECHKcrSyntax ~**CHKcr 32 ~Description Host OK Response No response. ExampleSyntax ~AA0CHKcr Host watchdog timeout flag, 0=Clear, 1=Set Example33 ~AA0 AASSCHKcr34 ~AA1 Syntax ~AA1CHKcr35 ~AA2 Syntax ~AA2CHKcr36 ~AA3EVV Syntax ~AA3EVVCHKcrAAPPSSCHKcr 37 ~AA4Syntax ~AA4CHKcr SS Safe Value, data format is same as PP Example38 ~AA5PPSS Syntax ~AA5PPSSCHKcrINIT* pin Operation Module StatusDigital Output Dual Watchdog OperationDigital Input and Event Counter Dual Watchdog = Module Watchdog + Host WatchdogHigh/Low Alarm Thermocouple Measurement