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Appendix B. Example Programs

B-2

B.2 Measuring Thermocouples

The following program measures 16 thermocouples on a CDM-A116. Because
the CDM-A116 can measure 4 thermocouples per terminal strip, this program
includes code to use the appropriate reference temperature measurement.

CRBasic Example B-2. Measuring Thermocouples

'This program example demonstrates measuring 16 thermocouples on a CDM-A116

'Declare Variables and Units

Dim

CDMTCRef(16)

Public

BattV

Public

PTemp_C

Public

CDMBattV

Public

CDMPTempC(4)

Public

Temp_C(16)

Units

BattV=Volts

Units

PTemp_C=Deg C

Units

CDMBattV=Volts

Units

Temp_C=Deg C

Units

CDMPTempC=Deg C

'Define Data Tables

DataTable

(Hourly,True,-1)

DataInterval

(0,60,Min,10)

Average

(16,Temp_C(),FP2,False)

Average

(4,CDMPTempC(),FP2,False)

EndTable

DataTable

(Daily,True,-1)

DataInterval

(0,1440,Min,10)

Minimum

(1,BattV,FP2,False,False)

Minimum

(1,CDMBattV,FP2,False,False)

EndTable

'Main Program

BeginProg

'Main Scan

Scan

(5,Sec,3,0)

'Measure CR6 Datalogger Battery Voltage

Battery

(BattV)

'Measure CR6 Datalogger Wiring Panel Temperature

PanelTemp

(PTemp_C,60)

'Measure CDM-A116 Battery Voltage

CDM_Battery

(CDM_A116,1,CDMBattV)

'Measure CDM-A116 Wiring Panel Temperatures

CDM_PanelTemp

(CDM_A116,1,CDMPTempC(),4,1,60)

'Populate CDMTCRef() array with copies of CDMPTempC() reference temperature
'measurements from CDM-A116 for use in thermocouple measurements

Move

(CDMTCRef(1),4,CDMPTempC(1),1)

Move

(CDMTCRef(5),4,CDMPTempC(2),1)

Move

(CDMTCRef(9),4,CDMPTempC(3),1)

Move

(CDMTCRef(13),4,CDMPTempC(4),1)

'Measure Type T (copper-constantan) Thermocouple on CDM-A116
'Syntax CDMTCRef(1)() increments reference temperature array with each repetition

CDM_TCDiff

(CDM_A116,1,Temp_C(),16,mv200C,1,TypeT,CDMTCRef(1)(),True,0,60,1,0)

'Call Data Tables and Store Data

CallTable

Hourly

CallTable

Daily

NextScan

EndProg

Содержание CDM-A100 Series

Страница 1: ...INSTRUCTION MANUAL CDM A100 Series CDM A108 and CDM A116 Revision 11 16 C o p y r i g h t 2 0 1 5 2 0 1 6 C a m p b e l l S c i e n t i f i c I n c ...

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Страница 3: ......

Страница 4: ...ner Campbell Scientific s shipping address is CAMPBELL SCIENTIFIC CANADA CORP RMA _____ 14532 131 Avenue NW Edmonton Alberta T5L 4X4 Canada For all returns the client must fill out a Statement of Product Cleanliness and Decontamination form and comply with the requirements specified in it The form is available from our web site at www campbellsci ca repair A completed form must be either emailed t...

Страница 5: ...e protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be killed or sustain serious bodily injury i...

Страница 6: ...z ounce 28 35 g 1 lb pound weight 0 454 kg Pressure 1 psi lb in2 68 95 mb Volume 1 US gallon 3 785 litres In addition part ordering numbers may vary For example the CABLE5CBL is a CSI part number and known as a FIN5COND at Campbell Scientific Canada CSC CSC Technical Support will be pleased to assist with any questions About sensor wiring Please note that certain sensor configurations may require ...

Страница 7: ......

Страница 8: ...minals 10 5 1 5 Power Terminals 11 5 1 5 1 Power In 11 5 1 5 2 Power Out 11 5 1 6 Communication Ports 11 5 1 6 1 USB Port 11 5 1 6 2 CPI Port 11 5 1 7 LED Indicators 11 5 1 7 1 COMM Status 11 5 1 7 2 CPI Port 11 6 Specifications 11 6 1 Voltage Measurements Specifications 12 6 2 Resistance Measurements Specifications 14 6 3 Voltage and Current Excitation Specifications 14 6 4 Period Averaging Speci...

Страница 9: ... 9 Mounting in an Enclosure 22 8 Operation 24 8 1 Measurements 24 8 1 1 First Notch Frequency 24 8 1 2 Panel Temperature 24 8 2 Fast Measurements 25 8 2 1 Measurement Speed 26 8 2 1 1 Sub Scans 27 8 2 1 2 Burst Measurements 27 8 2 2 CPI Network Bit Rate 28 8 3 Multiple Devices 29 8 4 Switched Voltage Output 29 8 4 1 Switched 5 Vdc 29 8 4 2 Switched 12 Vdc 29 9 Maintenance 29 9 1 Factory Calibratio...

Страница 10: ... 22 7 4 CDM DIN Rail Mounting Kit 23 7 5 Mounting the CDM A108 to a DIN rail 23 8 1 Wiring panel thermistor locations on CDM A108 left and CDM A116 right 25 Tables 6 1 Analog Voltage Measurement Accuracy Offsets 13 6 2 Analog Voltage Measurement Speed 13 6 3 Period Average Ranges 15 8 1 Multiplexed Analog Voltage Measurement Speed 26 8 2 Network Topology Bit Rate and Cable Length 28 10 1 CPIStatus...

Страница 11: ...Table of Contents iv ...

Страница 12: ...D UNDERSTAND the Safety section at the front of this manual WARNING o Protect from over voltage o Protect from water o Protect from ESD electrostatic discharge IMPORTANT Maintain a level of calibration appropriate to the application Campbell Scientific recommends factory recalibration of the CDM A100 every three years 3 Initial Inspection The CDM A108 and CDM A116 ship with the following o Pn 2938...

Страница 13: ...art Short Cut is an easy way to program your datalogger to measure sensors through a CDM A108 or CDM A116 and assign wiring terminals Short Cut is available as a download on www campbellsci com and the ResourceDVD It is included in installations of LoggerNet PC200W PC400 or RTDAQ This section will guide you through programming a CR6 datalogger to read a single ended voltage measured by a CDM A108 ...

Страница 14: ...Model and Scan Interval default of 5 seconds is OK for most applications Click Next 3 Under the Available Sensors and Devices list select the Devices folder then select the CDM A108 Click to move the selection to the Selected device window ...

Страница 15: ...tom of the Available Sensors and Devices pane With the CDM A108 tab selected select the Sensors Generic Measurements subfolder Select Single Ended Voltage Click to move the selection to the Selected device window 5 In the resulting window enter the CPI Address of the CDM A108 The default address is 1 ...

Страница 16: ...CDM A100 Series 5 6 Next provide the attributes of the single ended measurement Leave all settings at the default for this example To learn more about any setting click Help ...

Страница 17: ...hows the sensor connection to the CDM A108 8 Select any other sensors you have in the Sensors section and then finish the remaining Short Cut steps to complete the program The remaining steps are outlined in Short Cut Help which is accessed by clicking on Help Contents Programming Steps 9 If LoggerNet PC400 RTDAQ or PC200W is running on your PC and the PC to datalogger connection is active you can...

Страница 18: ... measurement channels and increases the measurement speed potential in a datalogger system CDMs operate through a datalogger program and communicate using the CAN peripheral interface CPI p 32 A single datalogger can operate up to 50 CDMs 5 1 Wiring Panel Overview To avoid damage to sensors and devices ensure that each removable wiring terminal strip is connected to the CDM A108 and CDM A116 in th...

Страница 19: ... Series 8 FIGURE 5 1 Wiring panel of CDM A108 left and CDM A116 right Signal Ground Earth Ground Analog Input Terminals Excitation Terminals Switched 5 V Power Ground Switched 12 V 12 V Out COMM Status LED USB ...

Страница 20: ... average inputs For example differential channel 1 is comprised of terminals 1H and 1L with 1H as high and 1L as low Maximum input voltage range 5000 mV Measurement resolution range 0 020 to 14 756 µVRMS 5 1 1 1 Single Ended Measurements A single ended measurement measures the difference in voltage between the terminal configured for single ended input and the reference ground Single ended termina...

Страница 21: ...on output supply precise current in the range of 2 5 mA These terminals are regularly used with resistive bridge measurements 5 1 3 Switched Voltage Output SW5V and SW12V terminals supply voltage and control for sensors The CDM A108 includes two SW5V and one SW12V terminals The CDM A116 includes four SW5V and two SW12V terminals 5 V control SW5V terminals supply 5000 mV See Section 6 5 3 Switched ...

Страница 22: ...USB for communicating with a PC through Device Configuration Utility p 32 software 5 1 6 2 CPI Port CPI p 32 is a proprietary protocol that supports CDMs Two RJ45 ports labeled CPI enable communications with a Campbell Scientific datalogger and other CDMs 5 1 7 LED Indicators 5 1 7 1 COMM Status When the CDM A100 has successfully been configured by a datalogger the COMM Status LED p 32 will flash ...

Страница 23: ...0 04 of Reading Offset2 40 to 70 C 0 06 of Reading Offset2 55 to 85 C 0 08 of Reading Offset2 Resolution See TABLE D 1 Analog Voltage Measurement Range and Resolution p D 1 Speed See TABLE 6 2 Analog Voltage Measurement Speed p 13 See also Section 8 2 Fast Measurements p 25 Input Resistance 20 GΩ Input Limits 5 Vdc Maximum Input Voltage 20 Vdc DC Common Mode Rejection 120 dB with input reversal 86...

Страница 24: ... 30000 1 46 698 49 0 75 1394 05 15000 1 53 667 41 0 78 1332 15 7500 1 66 612 87 0 85 1223 49 3750 1 93 526 78 0 98 1051 89 2000 2 40 422 83 1 22 844 59 1000 3 40 297 18 1 72 593 82 500 5 40 186 39 2 72 372 58 100 21 40 46 81 10 72 93 60 60 34 73 28 82 17 38 57 63 50 41 40 24 18 20 72 48 35 30 68 06 14 70 34 05 29 40 25 81 40 12 29 40 72 24 58 15 134 73 7 42 67 38 14 85 10 201 40 4 97 100 72 9 93 5...

Страница 25: ... not including bridge resistor errors and sensor and measurement noise 2 See CR6 Datalogger Manual for help estimating measurement accuracy for ratiometric measurements For Resistance instruction the excitation current is internally measured across an internal resistor 200 Ω 0 005 25 C 2 ppm C TCR with sensor resistance determined as Vs Ix where Ix is the measured excitation current and Vs is the ...

Страница 26: ...specified accuracy limits 6 4 Period Averaging Specifications Terminals CDM A108 SE 1 16 CDM A116 SE 1 32 Range See TABLE 6 3 Period Average Ranges Accuracy 0 01 of reading resolution Resolution 130 ns number of cycles TABLE 6 3 Period Average Ranges Voltage Gain Minimum Peak to Peak Signal1 2 mV Minimum Pulse Width µs Maximum Frequency kHz 1 500 2 4 200 3 8 50 8 50 19 10 50 8 67 2 80 5 1 With sig...

Страница 27: ...l 180 mA minimum 1 Unregulated below 14 5 V 6 5 3 Switched 5 Vdc Terminals CDM A108 SW5V 1 2 CDM A116 SW5V 1 4 Voltage Output On no load 4 75 0 25 Vdc Off 0 1 V Output Resistance 30 Ω Current Sourcing Limit See FIGURE 6 1 Current sourcing on SW5V terminals FIGURE 6 1 Current sourcing on SW5V terminals 0 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 ...

Страница 28: ...ompliance View EU Declarations of Conformity at www campbellsci com cdm a108 and www campbellsci com cdm a116 6 6 5 Physical Attributes Dimensions 20 3 x 12 7 x 5 1 cm 8 x 5 x 2 in additional clearance required for cables and leads Weight CDM A108 0 8 kg 1 75 lb CDM A116 0 9 kg 1 95 lb 7 Installation 7 1 Install Driver for PC Connection Installing the CDM A100 may require a connection to a PC Inst...

Страница 29: ...m use the CPIAddModule instruction A separate instruction is used for each device The CPIAddModule instruction overrides any settings entered by any other means such as Device Configuration Utility or the CPIStatus table CPIAddModule CDMType CDMSerialNo CDMDeviceName CPIAddress The datalogger creates an internal list of CPI p 32 modules from each CPIAddModule instruction Modules added at any time ...

Страница 30: ... tab Information about each module that is included in the datalogger program or connected to the CPI bus appears in the CPIStatus table within the ModuleInfo array Information is shown in the following order CDM Type Serial Number Device Name CPI Address Activity Within the ModuleInfo array index string the Device Name and CPI Address fields can be edited This provides a way to rename and readdre...

Страница 31: ...logger will attempt to process all of the data during the scan it is received which can result in skipped scans Scan buffers are only used when the datalogger is running in pipeline mode 7 4 2 CDM Instructions For the most current information on datalogger instructions refer to the Help files of CRBasic Editor The first two parameters for each CDM instruction are the ModuleType and CPI_Addr Module...

Страница 32: ...be necessary to use the CPISpeed instruction to decrease the CPI network bit rate from its default 250 kbps Limitations on cable length and bit rate are discussed further in Section 8 2 2 CPI Network Bit Rate p 28 and listed in TABLE 8 2 Network Topology Bit Rate and Cable Length p 28 7 6 1 Daisy Chain Topology In a daisy chain topology CDM A100s are connected one after another An illustration of ...

Страница 33: ... negative VDC terminals to allow for daisy chaining power supplies Terminals of the same type open and close together Insert the positive wire from the power supply into a VDC terminal and insert the negative wire into a VDC terminal FIGURE 7 3 Opening the power connector terminals 7 8 Earth Ground Connection Earth grounding provides protection from static discharge transients and power surges A g...

Страница 34: ...both screws on the baseplate of the CDM A100 and remove the baseplate 2 Screw the rubber bumper into the bottom outer hole 3 Use the screw from the kit to attach the metal clip to the middle hole with the comb pointing up as shown in FIGURE 7 5 a 4 Clip the CDM A100 to a DIN rail See FIGURE 7 5 b and c a b c FIGURE 7 5 Mounting the CDM A108 to a DIN rail ...

Страница 35: ...y that will be eliminated or notched out by a sinc filter This filter notches out frequencies at integer multiples of fN1 by averaging for a time equal to 1 fN1 Thus lower first notch frequencies result in longer measurement times Any value between 2 5 Hz and 30 kHz can be entered but the value will be rounded to the closest of 16 frequency options with the midway point rounding up The options for...

Страница 36: ... CR6 Measurement and Control System manual for more details on making good thermocouple measurements FIGURE 8 1 Wiring panel thermistor locations on CDM A108 left and CDM A116 right 8 2 Fast Measurements Follow the steps below when designing fast measurement CDM networks 1 Work out the time the CDM A100 will take to make all of the measurements Section 8 2 1 Measurement Speed p 26 2 Calculate the ...

Страница 38: ...tSe CDM_A108 1 FastSE i 1 mV5000 1 False 150 500 1 0 i i 1 increment index counter after each measurement NextSubScan CallTable FastSETable NextScan EndProg 8 2 1 2 Burst Measurements To measure at rates greater than the maximum sub scan rate of the datalogger switch the measurement into burst mode by negating the measurement channel parameter In burst mode the measurement dwells on a single chann...

Страница 39: ... rate that data is generated by the CDMs within the network To calculate how many kilobits per second kbps will be generated use the following equation for each CDM in your network Equation 8 1 Kilobits per second number of measurements measurement frequency 0 064 kilobits per measurement The network topology and cable length affect the maximum allowable CPI network bit rate Refer to TABLE 8 2 for...

Страница 40: ...xternal relay driver circuit because the port itself has limited drive capacity Drive capacity is determined by the 5 Vdc supply a Schottky diode and a 30 Ω output resistance It is expressed as V0 5 V 0 3 V 30 Ω x I0 Where V0 is the drive limit and I0 is the current required by the external device FIGURE 6 1 Current sourcing on SW5V terminals p 16 shows the relationship between supply voltage and ...

Страница 41: ...code To troubleshoot create a stripped down version of the program or break it up into multiple smaller units to test individually For example if a sensor signal to data conversion is faulty create a program that only measures that sensor and stores the data absent from all other inputs and data Write these mini programs before going to the field if possible 4 Verify that each CDM A100 in the netw...

Страница 42: ...s the current operation of the CDM A100 as shown in TABLE 10 2 below TABLE 10 2 COMM Status LED Activity Green Flashing Module has been configured by datalogger and is receiving sync signals Orange Flashing Device has not been configured by datalogger Red Single Flash Device has been configured but is not receiving sync signals Double Flash Device has encountered a scan timeout Solid Error 10 4 CP...

Страница 43: ...Ds For more information see TABLE 10 2 COMM Status LED Activity p 31 and TABLE 10 3 CPI Port LED Activity p 31 OS Operating System The CDM A100 datalogger and SC CPI each have an operating system The operating system is a set of instructions that controls the basic functions of the device The operating system is preloaded into the CDM A100 the datalogger and the SC CPI at the factory but can be re...

Страница 44: ... the processing mode according to the instructions in the program however it can be forced to sequential mode by using the SequentialMode instruction at the beginning of the program 12 References Campbell Scientific 2015 CR6 measurement and control system Operator s manual Campbell Scientific https s campbellsci com documents us manuals cr6 pdf Campbell Scientific 2012 4WFBS120 4WFBS350 4WFBS1K 4 ...

Страница 45: ...CDM A100 Series 34 ...

Страница 46: ...saving the Short Cut program 2 Open CRBasic Editor 3 Click File Open Assuming the default paths were used when Short Cut was installed navigate to C CampbellSci SCWin folder The file of interest has the CR6 CR1 CR8 or CR3 extension Select the file and click Open 4 Immediately save the file in a folder different from C Campbellsci SCWin or save the file with a different file name Once the file is e...

Страница 47: ......

Страница 48: ...with serial numbers 1234 1235 and 1236 and makes a single ended measurement on each unit s SE 1 channel Declare Variables and Units Public SEVolt1 Public SEVolt2 Public SEVolt3 Main Program BeginProg CPIAddModule CDM_A108 1234 A 4 CPIAddModule CDM_A108 1235 12345 5 CPIAddModule CDM_A116 1236 CDM_A108 in Pump House 6 Main Scan Scan 5 Sec 3 0 Generic Single Ended Voltage measurement SEVolt on CDM A1...

Страница 49: ...DataInterval 0 1440 Min 10 Minimum 1 BattV FP2 False False Minimum 1 CDMBattV FP2 False False EndTable Main Program BeginProg Main Scan Scan 5 Sec 3 0 Measure CR6 Datalogger Battery Voltage Battery BattV Measure CR6 Datalogger Wiring Panel Temperature PanelTemp PTemp_C 60 Measure CDM A116 Battery Voltage CDM_Battery CDM_A116 1 CDMBattV Measure CDM A116 Wiring Panel Temperatures CDM_PanelTemp CDM_A...

Страница 50: ...rminal RES SW5 2 CLK SW5 1 G G 12V 12V COM ODD H 1H COM ODD L 1L COM Ground Ground Symbol Declare Variables and Units Dim LCount Public MilliVolts 32 DataTable Table1 True 1 DataInterval 0 10 Min 10 Average 32 MilliVolts FP2 False EndTable Main Program BeginProg Main Scan Scan 1 Min 3 0 Turn AM16 32B Multiplexer on and advance to first channel CDM_MuxSelect CDM_A108 1 1 2 20 1 1 LCount 0 reset loo...

Страница 51: ...ime output using datalogger support software shows if the input noise can be reduced via the fN1 parameter CRBasic Example B 4 Measuring Bonded Foil Strain Gages This program measures four 350 Ohm bonded foil strain gages on DIFF channels 1 4 4WFBS350 bridge completion modules are used on each channel Declare Variables and Units Public BattV Public FCLoaded Public PTemp_C Public CReps Public ZMode...

Страница 52: ...lt Datalogger Battery Voltage measurement BattV Battery BattV Default Wiring Panel Temperature measurement PTemp_C PanelTemp PTemp_C 15000 Quarter Bridge Strain 3 wire 350 ohm with 4WFBS350 TIM measurement Vr1000 CDM_BrFull CDM_A116 10 Vr1000 4 mV200 1 X1 3 2500 False True 500 2000 1 0 Calculated strain result Strain for Quarter Bridge Strain 3 wire 350 ohm with 4WFBS350 TIM measurement Vr1000 Str...

Страница 53: ...Appendix B Example Programs B 6 ...

Страница 54: ...ated as 10186 µs Measurement Time 32 100 µs 106 µs s 30000 Hz 184 µs 31 µs 10186 µs The CR6 has a scan rate resolution of 1 ms so the fastest scan rate possible in this example is 11 ms b Choosing a more practical scan rate of 20 ms what is the longest cable that could be used between the CDM A116 and the CR6 to make these 32 measurements A scan rate of 20 ms 0 02 s equals a measurement frequency ...

Страница 55: ...Topology Bit Rate and Cable Length p 28 C 2 Example 2 a How many differential measurements can a CDM A116 or CDM A108 make at 5 ms 200Hz if input reversal is used This example uses the measurement time equation for measurements with input reversal from TABLE 8 1 Multiplexed Analog Voltage Measurement Speed p 26 Measurement Time repetitions 2 Tsettle 106 µs s fN1 180 µs 5 µs 31 µs The equation show...

Страница 56: ...input reversal so the resolution is given in the third column of TABLE D 1 Analog Voltage Measurement Range and Resolution p D 1 To achieve a resolution of less than 1 µVRMS within the 5000 mV range fN1 must be 100 Hz or better The measurement time is figured separately for each excitation channel used where the repetitions are the number of sensors excited on that channel In this setup three exci...

Страница 57: ...Appendix C Calculating Network Restrictions C 4 ...

Страница 58: ... 18 5 15000 5000 9 012 20 2 12 819 19 7 1000 1 948 20 1 2 809 19 5 200 0 700 19 2 1 030 18 7 7500 5000 7 158 20 5 10 050 20 0 1000 1 544 20 4 2 266 19 8 200 0 553 19 5 0 817 19 0 3750 5000 5 410 20 9 7 851 20 4 1000 1 166 20 8 1 689 20 3 200 0 410 20 0 0 627 19 4 2000 5000 4 047 21 3 5 806 20 8 1000 0 894 21 2 1 290 20 7 200 0 310 20 4 0 459 19 8 1000 5000 2 838 21 9 4 359 21 2 1000 0 613 21 7 0 9...

Страница 59: ...1 24 0 0 217 23 2 200 0 042 23 3 0 099 22 0 25 5000 0 580 24 1 0 858 23 6 1000 0 123 24 0 0 204 23 3 200 0 038 23 4 0 095 22 1 15 5000 0 502 24 4 0 734 23 8 1000 0 107 24 2 0 177 23 5 200 0 031 23 7 0 088 22 2 10 5000 0 499 24 4 0 683 23 9 1000 0 108 24 2 0 161 23 7 200 0 029 23 8 0 082 22 3 5 5000 0 472 24 4 0 617 24 1 1000 0 102 24 3 0 151 23 7 200 0 024 24 1 0 082 22 3 2 5 5000 0 447 24 5 0 564...

Страница 60: ......

Страница 61: ...Rua Apinagés nbr 2018 Perdizes CEP 01258 00 São Paulo SP BRASIL www campbellsci com br vendas campbellsci com br Campbell Scientific Canada Corp 14532 131 Avenue NW Edmonton AB T5L 4X4 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A 300 N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc info campbellsci cc Campbell Sci...

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