Campbell CR23X Specifikace stáhnout pdf (Strana 107)

SECTION 7. MEASUREMENT PROGRAMMING EXAMPLES

7-19

CR23X

CONNECTIONS

FIGURE 7.16-1. CR23X/Paroscientific "T" Series Transducer Wiring Diagram

PROGRAM EXAMPLE

The following example reads the coefficients

from a subroutine only when the datalogger

program is compiled. The coefficients are

stored in Input Locations 3 through 16. The

temperature frequency is read on single-ended

Channel 1 and stored in Input Location 1.

Pressure is measured on single-ended Channel

2 and stored in Location 2. Instruction 64

converts the readings to engineering units.

Temperature (°C), pressure (psi), and signature

are stored in Locations 19 through 21,

respectively. The signature is based on the 14

coefficients. Record the signature once the

coefficients are correctly entered in the

program. The recorded signature may be used

to identify any changes made to the coefficients

at a later date. Instructions to output the

readings to Final Storage are not included in

this example.

PROGRAM

* Table 1 Program

01: 60 Execution Interval (seconds)

;Load the coefficients if the program has

;just compiled.

;

01: IF (X<=>F) (P89)

1: 17 X Loc [ Comp_Chk ]

2: 1 =

3: 0 F

4: 1 Call Subroutine 1

;Measure the temperature period in

;microseconds.

;

02: Period Average (SE) (P27)

1: 1 Reps

2: 4 Input Gain = 1

3: 1 SE Channel

4: 9000 No. of Cycles

5: 6 Timeout (units = 0.01 seconds)

6: 1 Loc [ Temp_us ]

7: 1 Mult

8: 1 Offset

;Measure the pressure period in

;microseconds.

;

03: Period Average (SE) (P27)

1: 1 Reps

2: 4 Input Gain = 1

3: 2 SE Channel

4: 5000 No. of Cycles

5: 15 Timeout (units = 0.01 seconds)

6: 2 Loc [ Press_us ]

7: 1 Mult

8: 0 Offset

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 373 374

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