Campbell-scientific SDM-CVO4 4-Channel Current/Voltage Output Module Instrukcja Użytkownika Pobierz pdf (Strona 24)

SDM-CVO4 4-Channel Current/Voltage Output Module

; As we have four channels to output, we will first copy the

; current readings with P54, block move, in a block of four

; input locations to hold the scaled outputs

9: Block Move (P54)

1: 4 No. of Values

2: 1 First Source Loc [ WindSpeed ]

3: 1 Source Step

4: 5 First Destination Loc [ ScldOut_1 ]

5: 1 Destination Step

; Then apply the scaling with one Instruction P53

; The readings are scaled -5000 to +5000, i.e. to

; cover the full scale range which would equate to

; 0 - 10,000 mV in voltage mode or 0-20 mA in

; current mode.

; Windspeed to cover the range 0-100 m/s

; Wind direction to cover 0-360 degrees

; Temperature -25 to +50 degrees C

; Radiation 0 - 1000 m^2/s

10: Scaling Array (A*Loc+B) (P53)

1: 5 Start Loc [ ScldOut_1 ]

2: 100 A1 ; WS multiplier

3: -5000 B1 ; WS Offset

4: 27.7778 A2

5: -5000 B2

6: 133.333 A3

7: -1666.67 B3

8: 10 A4

9: -5000 B4

; Now update the SDM-CVO4 with the information

; for the four channels

11: SDM-AO4 (P103)

1: 4 Reps

2: 30 SDM Address

3: 5 Loc [ ScldOut_1 ]

6.5.2 Restricted Range Current Output Modes (4-20 mA)

When driving a system that requires a restricted current range then the full-

scale range is reduced accordingly. In the case of 4-20 mA devices the

maximum range is 8000 units and the minimum value should be scaled to

-3000 and prevented from going below this level.

The following partial program could be used in place of the last two

instructions in the example above.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30

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Campbell-scientific SDM-CVO4 4-Channel Current/Voltage Output Module Instrukcja Użytkownika Strona 24