Campbell Scientific SDM-CD16S 16-Channel Solid State DC Relay Controller Module - Manual (Page 20)

SDM-CD16S 16 Channel Solid State DC Control Module
33: Beginning of Loop (P87) Start fan loop
1: 0 Delay
2: 5 Loop Count
34: Z=F (P30)
PUT A "1" INTO FAN
1: 1 F CONTROL LOCATION
2: 0 Exponent of 10
3: 20-- Z Loc :
35: End (P95)
End fan loop
36: End (P95)
End then do
37: If time is (P92)
1: 0 minutes into a Reset flag 2 at the
2: 15 minute interval end of the 15 minute
3: 22 Set low Flag 2
END FAN CONTROL LOGIC BASED ON TIME
INPUT LOCATIONS 10 THROUGH 24 ARE NOW LOADED WITH "1" OR "0" TO SET
PORTS ON THE SDM-CD16S.
38: SDM-CD16S (P104)
Send instructions to the
1: 1 Reps SDM-CD16S with address 00
2: 00 Address
3: 10 Loc
39: End Table 1 (P)
8.3 Control Gas Sampling Based on Time – CR1000
The SDM-CD16S is ideal for controlling low power DC operated solenoid
valves such as might be used to control a manifold as part of a gas sampling
system. This example shows one way to do that.
8.3.1 Terminology
Site: A site may be the physical site where the air is sampled (i.e. intake or
chamber) or a connection to a calibration gas. Each site has a unique
SDMCD16S/valve setting that configures the manifold to connect gas from
that site to the sample path of the gas analyzer. There are 8 connections to the
“site selection” manifold. The numbers 1 through 8 identify the sites. The site
numbers are the same as the number of the intake on the manifold and the
number of the SDMCD16 relay controlling that valve. Sites 1 – 6 are
connected to sample intakes to measure a atmospheric profile and sites 7 and 8
are used for calibration gases.
Site Sequence: The sequence in which the sites are measured is determined
by the SiteSequence array. The sites are measured in the sequence that the site
numbers are entered in this array, not necessarily in order of site number.
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