SDM-CD16S 16 Channel Solid
State DC Control Module
1/08
Copyright © 2000-2008
Campbell Scientific, Inc.
Warranty and Assistance
The SDM-CD16S 16 CHANNEL SOLID STATE DC CONTROL
MODULE is warranted by CAMPBELL SCIENTIFIC, INC. to be free from
defects in materials and workmanship under normal use and service for twelve
(12) months from date of shipment unless specified otherwise. Batteries have
no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this
warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC,
INC.'s option) defective products. The customer shall assume all costs of
removing, reinstalling, and shipping defective products to CAMPBELL
SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such
products by surface carrier prepaid. This warranty shall not apply to any
CAMPBELL SCIENTIFIC, INC. products which have been subjected to
modification, misuse, neglect, accidents of nature, or shipping damage. This
warranty is in lieu of all other 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 damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
SDM-CD16S Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
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1. Function........................................................................1
2. Specifications ..............................................................2
3. Power Considerations.................................................3
4. Installation.................................................................... 4
4.1 Wiring.......................................................................................................5
4.1.1 SDM-CD16S Power and Control Connections............................... 5
4.1.2 Controlled Device Connections......................................................6
5. Address Selection Switch...........................................6
6. Datalogger Instructions ..............................................7
6.1 CRBasic Dataloggers (CR800, CR850, CR1000, CR3000, CR5000,
CR9000(X)) ................................................................................................7
6.2 Datalogger Instructions 104 (CR10/10X, CR23X, 21X, CR7)
and 29 (older CR7s)....................................................................................8
7. Theory of Operation ....................................................9
8. Program Examples....................................................10
8.1 Control Temperature and Fans – CR1000..............................................10
8.2 Control Temperature and Fans – CR10X...............................................12
8.3 Control Gas Sampling Based on Time – CR1000..................................16
8.3.1 Terminology..................................................................................16
8.3.2 Data Tables ...................................................................................17
8.3.3 Initialization Section (between BeginProg and Scan)...................17
8.4 Control Gas Sampling with Timing in Measurement Task – CR1000...20
8.4.1 The Purpose of this Example........................................................20
8.4.2 Pipeline vs Sequential...................................................................20
8.4.3 TimedControl Instruction..............................................................21
Figures
1. SDM-CD16S Face Panel............................................................................1
2. Equivalent Output Driver Circuit ................................................................3
3. Connection Block Diagrams.......................................................................4
4. Typical Wiring Application........................................................................6
i
SDM-CD16S Table of Contents
Tables
1. Datalogger to SDM-CD16S Connections.................................................. 6
2. Switch Position and Addresses.................................................................. 7
ii
SDM-CD16S 16 Channel Solid State DC Control Module
1. Function
FIGURE 1. SDM-CD16S Face Panel
The SDM-CD16S has 16 DC voltage outputs that can be switched on and off
manually or under datalogger control. Separate inputs for the power to the
outputs (48 VDC max) and the power to SDM-CD16 logic (7 – 48 VDC)
allow the option of powering the logic from the datalogger 12 V while
switching a higher voltage. LEDs allow a visual indicator of active outputs.
The outputs can be controlled by a datalogger or controlled manually with a
manual override toggle switch and individual rocker switches for each of the
outputs.
The toggle switch has three positions: MANUAL, OFF and AUTO. In the
MANUAL position, outputs are controlled by the position of the individual
rocker switches. In the OFF position, all outputs are off. In the AUTO
position, the state of the relays is controlled by the SDM commands from the
datalogger or by the logic control inputs.
The SDM-CD16S is a synchronously addressed datalogger peripheral.
Datalogger control ports 1, 2, and 3 are used to address the SDM-CD16S, then
clock out the desired state of each of the 16 control ports. Up to 16 SDMCD16Ss may be addressed, making it possible to control a maximum of 256
ports from the datalogger’s first three control ports. The SDMCD16AC
instruction is used to control the SDM-CD16S in CRBasic dataloggers. In
1
SDM-CD16S 16 Channel Solid State DC Control Module
Edlog dataloggers that support SDM-CD16 devices, I/O Instruction 104 is
used (some old CR7s may use Instruction 29).
In addition to SDM control, the SDM-CD16S has individual digital control
inputs for each of the outputs. A logic high (5 V) on the control input will set
the associated output high. The control input OR the SDM command can set
the output high. Both the SDM command and the control input must be low
for the port to be low. The logic control inputs may be useful for using one of
the datalogger’s control ports with the pulse width modulation instruction for a
proportional control that changes faster than the datalogger scan rate. (The
pulse width modulation instruction is PWM in CRBasic dataloggers,
Instruction 137 in the CR23X.) Devices other than the datalogger that have a
0V/5V logic output for control might also be used to activate the digital control
inputs.
NOTE
Ensure that the datalogger contains the appropriate instruction
and test your datalogger program before going in the field.
2. Specifications
Compatible dataloggers: CR9000(X), CR5000, CR3000,
Logic power voltage: 7 to 48 VDC
Logic current drain at 12 VDC: 15 mA quiescent;
Maximum cable length: 20 ft total to all SDM devices.
Toggle switch: MANUAL, OFF, AUTO
Supply voltage for output: 48 Volt Max, DC only
Maximum current per channel: 2 Amps
Maximum current all channels total: 10 Amps Fused
CR1000, CR850, CR800, CR23X,
CR10, 21X, and CR7.
2.5 mA per active LED (manual or
auto)
Consult CSI if longer lengths are
necessary.
Individual dip switches for manual
2
Fuse: 3 AG – 10 A
Actuation/release times: 8 μs/200 μs
Operating temperature: -40° to 70°C
* If more detailed output characteristics are required, experienced users should
consult the equivalent circuit diagrams shown in Figure 2, below.
SDM-CD16S 16 Channel Solid State DC Control Module
FIGURE 2. Equivalent Output Driver Circuit
3. Power Considerations
The SDM-CD16S power requirements may be large compared to most CSI
products. For most applications, an external power supply (see Figure 3) is
recommended to power the SDM-CD16S.
For some applications, it may be convenient to use the datalogger supply to
power the SDM-CD16S (see Figure 3). For long-term applications, the lead
acid power supply available with CSI dataloggers should be used, allowing the
batteries to be float charged. It is not recommended that the datalogger
alkaline supply be used to power the SDM-CD16S for long term applications.
If the datalogger lead acid supply is used, the current available from the wall
charger limits the SDM-continuous output current.
3
SDM-CD16S 16 Channel Solid State DC Control Module
EXTERNAL
7 TO 48 VDC
+ —
GND
SDM-CD16S
Connection with External Supply
SDM-CD16S
Connection with Datalogger Supply
FIGURE 3. Connection Block Diagrams
If the 21X power supply is used to power the SDM-CD16S Load Power, all
low level analog measurements (thermocouples, pyranometers, thermopiles,
etc.) must be made differentially. This is a result of slight ground potentials
created along the 21X analog terminal strip when the 12 V supply is used to
power peripherals. This limitation reduces the number of available analog
input channels and may mandate an external supply for the SDM-CD16S.
C1
C2
C3
GND
12 V
C1
C2
C3
DATALOGGER
DATALOGGER
4. Installation
CAUTION
4
• The SDM-CD16S must be installed in an enclosure that provides a
pollution degree 2 environment (normally, only nonconductive pollution.
However, a temporary conductivity caused by condensation may be
expected). All Campbell Scientific enclosures meet this requirement.
• Use copper conductors only.
Cables connecting the terminals of the datalogger and
SDM device should be kept as short as possible to
minimize the risk of corruption of the signals and damage
from induced surges. Where long cable runs (>3 m) are
unavoidable and the cables run outside, some extra
protection may be required for the SDM control terminals.
Please contact Campbell Scientific for further advice.
When connecting wires to the SDM signal terminals,
please ensure they are at ground potential before making
the connection, e.g. by touching them to the earth terminal.
SDM-CD16S 16 Channel Solid State DC Control Module
For datalogger connections, see Table 1.
Multiple SDM-CD16Ss may be wired in parallel by connecting the datalogger
side of one SDM-CD16S to the next. In most installations the total length of
the cables connecting the SDM-CD16S and other SDM peripherals should not
exceed 20 feet.
Total cable lengths in excess of 20 feet may adversely influence
communication performance. (For CR7 dataloggers, the total cable length
should not exceed 600 feet.)
4.1 Wiring
4.1.1 SDM-CD16S Power and Control Connections
Refer to Figure 3 and Table 1 for SDM-CD16S operating power and control
connections to the datalogger.
EXTERNAL
7 TO 48 VDC
SDM-CD16S
SDM-CD16S
FIGURE 3. Connection Block Diagrams
+ —
GND
C1
C2
C3
Connection to External Supply
GND
12 V
C1
C2
C3
Connection to Datalogger Supply
DATALOGGER
DATALOGGER
5
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