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Campbell AM16, Инструкция по эксплуатации

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AM16/32A Relay Analog Multiplexer 

'CR5000 Example Program to measure 16 100 ohm Platinum Resistance Thermometers ‘connected to an 
AM16/32A multiplexer used in the 4x16 configuration. The program also ‘measures 6 copper constantan 
'thermocouples. 
'The Thermocouples are connected to differential channels 1-6.  
 
'Declare Variables: 

Public TRef, TCTemp(6), PRTResist(16), PRTTemp(16) 
Dim I   

 

 

 

 

 

 

 

 

'Counter for setting Array element to correct value for mux measurement

 

 

'Declare Output Table for 15 minute averages: 

DataTable (Avg15Min,1,-1) 
 DataInterval 

(0,5,Min,10) 

 Average 

(1,TRef,IEEE4,0) 

 Average 

(6,TCTemp(),IEEE4,0) 

 Average 

(16,PRTTemp(),IEEE4,0) 

EndTable 
 
BeginProg 
 Scan 

(60,Sec,3,0) 

  PanelTemp 

(TRef,250) 

 

 

TCDiff (TCTemp(),6,mV20C ,1,TypeT,TRef,True ,0,250,1.0,0) 

  Portset 

(1 

,1) 

     

'Set C1 high to Enable Multiplexer 

  Delay 

(0,150,mSec) 

 

 

I=0 

  SubScan(0,sec,16) 

 

 

 

'Pulse C2 (Set High, Delay, Set Low) to clock multiplexer 

   Portset 

(2,1 

) 

 

 

 

Delay (0,20,mSec) 

   Portset 

(2,0) 

   I=I+1 

 

 

 

'The Resistance measurement measures the PRT resistance:  

   Resistance 

(PRTResist(I),1,mV50,7,Ix1,1,500,True 

,True 

,0,250,0.01,0) 

 

 

 

'With a multiplier of 0.01 (1/100) the value returned is R/Ro (Resist/Resist @ 0 deg) 

 

 

 

'the required input for the PRT temperature calculation instruction. 

  NextSubScan 
  Portset 

(1 

,0) 

     

'Set C1 Low to disable Multiplexer

 

 

 

‘Calculate the Temperature from R/Ro: 

  PRT 

(PRTTemp(1),16,PRTResist(1),1.0,0) 

  CallTable 

Avg15Min 

   

‘Call the DataTable

 

 NextScan 
EndProg 

 

5.3.2  CR1000, CR800, and CR850 Programming 

Although the following example is a CR1000 program, a similar 
program can be used for the CR800 or CR850.  This CR1000 
program uses the AM16/32A to measure 48 CS616 probes connected 
in the 4x16 configuration.  The program also measures datalogger 
battery voltage and temperature. 

20 

Содержание AM16

Страница 1: ...AM16 32A Relay Multiplexer Revision 11 07 C o p y r i g h t 1 9 8 7 2 0 0 7 C a m p b e l l S c i e n t i f i c I n c...

Страница 2: ...ther warranties expressed or implied including warranties of merchantability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential...

Страница 3: ...Programming 10 5 1 Single Loop Instruction Sequence 11 5 2 Multiple Loop Instruction Sequence 16 5 3 CRBasic Programming 18 5 3 1 CR5000 and CR3000 Programming 19 5 3 2 CR1000 CR800 and CR850 Program...

Страница 4: ...Mode 9 6 SCWIN Short Cut for Windows Program Builder 10 7 Example 4x16 Mode Program Loops for CR23X CR10 X 21X and CR7 Dataloggers 14 8 Example 2x32 Mode Program Loops for CR23X CR10 X 21X and CR7 Da...

Страница 5: ...rement Customers who need to switch power are directed to Campbell Scientific s SDM CD16AC A6REL 12 or A21REL 12 relays Changing the setting of the mode switch from 4x16 to 2x32 connects COM ODD H to...

Страница 6: ...This is a blank page...

Страница 7: ...16 32A depends primarily on the type s of sensors to be scanned The following guidelines assume identical sensors Up to 32 single ended or differential analog sensors that do not require excitation Fo...

Страница 8: ...housed in a 10 2 cm x 23 9 cm x 4 6 cm 4 0 x 9 4 x 1 8 anodized aluminum case Figure 1 The aluminum case is intended to reduce temperature gradients across the AM16 32A s terminal strips An aluminum c...

Страница 9: ...pical in 4 x 16 mode Reset A continuous signal between 3 5 VDC and 16 VDC holds the AM16 32A in an active state where a clock pulse can trigger a channel advance A signal voltage 0 9VDC deactivates th...

Страница 10: ...ay Switching Thermal emf 0 3 V typical 0 5 V maximum Characteristics applying 11 3 14 VDC Operate time 10 ms over temperature and supply ranges Break before make guaranteed by design ESD Air Discharge...

Страница 11: ...r measurement terminals 4 1 The Control Terminals The CR5000 CR3000 CR800 CR850 CR1000 CR23X CR10 X 21X and CR7 dataloggers connect to the AM16 32A as shown in Figure 3 4x16 mode Figure 3 depicts cont...

Страница 12: ...talogger control port Instruction 86 option code 41 48 to activate and 51 58 to deactivate is generally used to activate deactivate the multiplexer however in the case of the 21X or CR7 with older PRO...

Страница 13: ...should also connect to the separate supply s ground Figure 4 An AM16 32A COM terminal should connect to a datalogger ground terminal or G via the MUXSIGNAL cable or equivalent also according to Figur...

Страница 14: ...trip when the 12V supply is used to power peripherals This limitation reduces the number of available analog input channels and may mandate the use of an external supply for the AM16 32A Figure 4 FIGU...

Страница 15: ...1L SE2 SE1 SE1 SE1 SE1 1H 1H SE1 FIGURE 5 Typical AM16 32A to Datalogger Signal Hookup 4x16 Mode 4 2 2 Sensor Input Terminals The terminals for sensor attachment are divided into 16 groups panel swit...

Страница 16: ...onnects to COM EVEN H and COM ODD L connects to COM EVEN L when panel switch is in 2x32 mode 5 Datalogger Programming A good way for the beginner or veteran datalogger programmer to create an AM16 32A...

Страница 17: ...ecuted before the program exits the loop 3 Clock and Delay With the CR23X and CR10 X the clock line is connected to a control port Instruction 86 with the pulse port command 71 78 pulses the clock lin...

Страница 18: ...ructions is indexed For example 2 sensors per SET one rep in each of two measurement instructions two measurement values assigned to indexed input locations one begins with input location 1 the other...

Страница 19: ...must be assigned using the datalogger A mode Consult your datalogger manual for details NOTE 6 Optional Processing Additional processing is sometimes required to convert the reading to the desired un...

Страница 20: ...Ex 0 01 sec units 3 15 Delay after Ex 0 01 sec units 4 0 mV Excitation BEGIN MEASUREMENT LOOP 3 Beginning of Loop P87 1 0 Delay 2 16 Loop Count CLOCK PULSE AND DELAY 4 Excitation with Delay P22 1 1 E...

Страница 21: ...01 sec units 3 15 Delay after Ex 0 01 sec units 4 0 mV Excitation BEGIN MEASUREMENT LOOP 3 Beginning of Loop P87 1 0 Delay 2 32 Loop Count CLOCK PULSE DELAY 4 Excitation with delay P22 1 1 EX Chan 2 2...

Страница 22: ...ate and deactivate the AM16 32A Steps 1 and 9 The instruction sequence for control of an AM16 32A is given on the following page The program format is a product of Edlog a datalogger program editor co...

Страница 23: ...4 Do P86 1 72 Pulse Port 2 DELAY 5 Excitation with Delay P22 1 1 EX Chan 2 0 Delay w EX units 01sec 3 1 Delay after EX units 01sec 4 0 mV Excitation FULL BRIDGE MEASUREMENT INSTRUCTION 6 Full Bridge...

Страница 24: ...TRAIN 7 19 POT 9 8 STRAIN 8 20 POT 10 9 STRAIN 9 21 POT 11 10 STRAIN 1022 POT 12 11 POT 1 23 _________ 12 POT 2 24 _________ 5 3 CRBasic Programming The CR5000 CR800 CR850 CR3000 and CR1000 are progra...

Страница 25: ...surement on a four wire sensor e g a PRT such as shown in Figure 14 using only a single differential channel and no fixed resistor the excitation return goes directly to ground With the current excita...

Страница 26: ...to Enable Multiplexer Delay 0 150 mSec I 0 SubScan 0 sec 16 Pulse C2 Set High Delay Set Low to clock multiplexer Portset 2 1 Delay 0 20 mSec Portset 2 0 I I 1 The Resistance measurement measures the P...

Страница 27: ...lic Flag 1 Dim I Declare Constants CS616 Default Calibration Constants const a0 0 0663 const a1 0 0063 const a2 0 0007 Flag logic constants const high true const low false Define Data Tables DataTable...

Страница 28: ...This section covers sensor to AM16 32A connections as well as AM16 32A to datalogger connections The following are exampl only and should not be construed as the only way to make a particular measure...

Страница 29: ...erential Measurement without Excitation 6 2 Differential Analog Measurement without Sensor Excitation at th panel tch set to 4x16 mode Sensor shields are connected to the input Sensor to Multiplexer w...

Страница 30: ...xed Because excitation and ground may be multiplexed in common up to two sensors per SET may be measured Figure 13 If measured excitation is require i e four wire half bridge then only one sensor per...

Страница 31: ...analog input channels One COM terminal is connected to a datalogger switched excitation channel and the remaining COM line connects to datalogger ground Up to 32 potentiometers may be measured by two...

Страница 32: ...e Section 5 3 for an example ur Wire Half Bridge Hook up and Measurement 4 X 16 Mode COM H ODD COM L COM H EVEN COM L ODD H ODD L EVEN H EVEN L SHIELD SENSOR SHIELDS COM 0 CR23X CR800 CR850 CR1000 21X...

Страница 33: ...he datalogger s citation and ground leads can be multiplexed through an additional AM16 32A allowing the sensors to be excited one at a time Figure 16 In this case the 12V GND second multiplexer are w...

Страница 34: ...L terminal then a tween the multiplexer s COM ODD L easurement terminal Figures 17 and mocouple th respect to the datalogger res between datalogger and AM16 32A are e e dat same wire type as the ther...

Страница 35: ...H H H H L L L L EX E E VX H H H H AG H H H H L L L L G FIGURE 18 Differential Thermocouple Measurement with Reference Junction at the AM16 32A If a mix of TCs and other sensor types are multiplexed t...

Страница 36: ...sipate before it reaches the terminals If the AM16 32A is housed in a field enclosure the enclosure should be shielded from solar radiation FIGURE 19 AM16 32A Aluminum Cover Plate 6 6 2 Single ended T...

Страница 37: ...e run xer and the datalogger 6 7 Mixed Sens In applications where sensor types are mixed multiple hook up possible Please consult CSI for application assistance if you need to multiplex 6 7 1 Mixed Se...

Страница 38: ...SETS 1 16 ODD L EVEN H EVEN L COM G 32 FIGURE 20 Thermocouple and Soil Block Measurement for CR10X Example 1 T 33 LOCATIONS ALLOCATED TO INPUT STORAGE able 1 Programs 1 60 Sec Execution Interval REFER...

Страница 39: ...1 Mult 8 0 Offset MEASURES 1 SOIL MOISTURE BLOCK PER LOOP 7 AC Half Bridge P5 1 1 Rep 2 14 250 mV fast Range 3 3 IN Chan 4 2 Excite all reps w EXchan 2 5 250 mV Excitation 6 18 Loc SOIL M 1 7 1 Mult 8...

Страница 40: ...16 Dim I Counter for setting Array element Define Da les ta Tab DataTable Avg15Min 1 1 DataInterval 0 5 Min 10 Minimum 1 batt_volt FP2 0 False Averag T mp IEEE4 False e 1 P e Avera TCTemp ge 16 IEEE4...

Страница 41: ...on resistors at the datalogger terminal strips Certain sensors specific to the use of multiplexers are available from CSI Examples include soil moisture probes and thermistor probes Please consult ng...

Страница 42: ...se h conduits bs The AM16 32A has mounting tabs allowing attachment by four screws See Figure 21 dimensions 9 4 in 23 9 cm 1 in 2 54 cm 3 in 7 62 cm AM16 32 AM16 32A FIGURE 21 Mounting Tab Hole Patter...

Страница 43: ...32A replaced the AM16 32 in October 2006 The AM16 32A s improvements over the AM16 32 are better ESD and surge protection a main ground lug and a newer processor The AM16 32A is wired and programmed t...

Страница 44: ...This is a blank page...

Страница 45: ...This is a blank page...

Страница 46: ...L www campbellsci com br suporte campbellsci com br Campbell Scientific Canada Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Sci...

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