SDM-CD16AC 16 Channel AC/DC Controller

'Dimension Variables Public src(32)

Dim i, count, mask(16)

'Program BeginProg for i=1 to 16

mask(i) = 2^(i-1) next i Scan(20,msec,2,0)

count = count + 1 for i=1 to 32

src(i) = count AND mask(((i-1) MOD 16) +1) next i

SDMCD16AC(src(),2,1) NextScan

EndProg

8.2 Edlog Example

The example is written for the CR10(X) Measurement and Control Module. The program concepts presented are the same for the CR23X, 21X, and CR7 dataloggers with minor program code changes.

In this example, the SDM-CD16AC is used to control the temperature between 23° and 28°C in each of 5 greenhouses. In each green house the SDM- CD16AC controls a heating unit, a refrigerating unit, and an air mixing fan according to the following conditions.

Heating unit: Activate when temperature < 23.5°C. Deactivate when temperature > 25.5°C

Cooling unit: Activate when temperature > 27.5°C. Deactivate when temperature < 24.5°C

Mixing fan: Activate whenever the heating or cooling units are activated.

Activate for 5 minutes out of every 15 minutes.

The program assumes the temperature measurements have been made, and the average temperature for each greenhouse is computed and residing in Input Locations 1 through 5.

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