With an SDM-CD16AC, your Campbell Scientific data logger can automatically activate external ac or dc devices such as motors, pumps, heaters, valves, and fans. This ac/dc relay controller has 16 ports for connecting your ac or dc devices. Each port can be controlled automatically by the data logger’s program or controlled manually with an override toggle switch.Read More
The SDM-CD16AC has a toggle switch that provides three positions: ON and OFF for manual override, and AUTO for data logger control.
The SDM-CD16AC is a synchronously addressed data logger peripheral. Data logger control ports 1, 2, and 3 are used to address the SDM-CD16AC, then clock out the desired state of each of the 16 control ports. Up to 16 SDM-CD16ACs may be addressed, making it possible to control a maximum of 256 ports from the first three data logger control ports.
|Function||Allows a data logger to automatically activate external ac or dc devices such as motors, pumps, heaters, valves, and fans.|
|Number of Channels||16|
|Operating Temperature||-40° to +55°C|
|Contact Operation||Single pole double throw (break before make)|
|Contact Material||Gold-clad silver|
|Coil Voltage||11 to 18 Vdc|
|Coil Resistance||360 Ω ±10%|
|Expected Life (contact closures)||Mechanical 107|
|Actuation/Release Time||~4 ms|
|Operating Voltage||12 Vdc nominal (11 to 18 Vdc)|
|Standards||Underwriters Laboratories (UL) listed product (E162021)|
|Dimensions||24.6 x 5.1 x 8.6 cm (9.7. x 2.0 x 3.4 in.)|
|Weight||0.8 kg (1.8 lb)|
Individual Contact Ratings
|Normally Open Rating||
|Normally Closed Rating||
Current Drain @ 12 Vdc
|Per Active LED||45 mA (switch on or auto active)|
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
|CR9000 (retired)||Although the CR9000 is compatible, the SDM-CD16AC does not support its fastest communication rates and therefore is not practical for most of its applications.|
|CR9000X (retired)||Although the CR9000X is compatible, the SDM-CD16AC does not support its fastest communication rates and therefore is not practical for most of its applications.|
Up to 16 SDMs can be connected to our data loggers. To communicate with connected SDM devices, the CR3000 and CR5000 use the SDM-C1, SDM-C2, and SDM-C3 ports. The other data loggers use ports labeled C1, C2, and C3. The 21X also requires channel 1H.
The SDMCD16AC Instruction controls SDM-CD16AC operation in CRBasic. Edlog Instruction 29 controls SDM-CD16AC operation in the CR7, and Edlog Instruction 104 controls SDM-CD16AC operation in the CR10(X), CR23X, and 21X data loggers.
The data logger's rechargeable power supply, connected to our newer 1.2 A wall charger, is sufficient for powering the SDM-CD16AC. The SDM-CD16AC's LEDs consume 45 mA each when active. If all 16 LEDs are active at once, a current drain of over 720 mA should be expected. If more than one SDM-CD16AC will be used, a deep-discharge external battery may be necessary. This external battery should share a common grounding point with the data logger's ground.
Campbell Scientific does not recommended using the data logger’s alkaline batteries to power the SDM-CD16AC for long-term applications.
The SDM-CD16AC requires a desiccated, non-condensing environment; a Campbell Scientific enclosure is recommended. Grommets and screws are provided to attach the flanges/bracket to the backplate of our enclosures.
There are three example programs for the CDM-CD16AC. The first program demonstrates using two SDM-CD16AC modules to control pumps and heaters based on water level and temperature thresholds. The remaining two programs are designed to control the temperature in five greenhouses. The temperature will be maintained between 23 and 28 °C in each greenhouse. In each greenhouse, the SDM-CS16AC controls a heating unit, a refrigerating unit, and an air-mixing fan according to these 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 difference between program 2 and program 3 is the method used to control outputs. Program 2 uses an array to set the SDM-CD16AC outputs. Program 3 uses a Long integer, with each bit in the variable controlling one of the outputs.
Number of FAQs related to SDM-CD16AC: 1
The following relay devices can be used with the CR800 and the CR850:
The CR800 and the CR850 can also be used with a wide variety of third-party relay devices.
*Because the CR800 and the CR850 only have four digital ports, they do not have the ability to switch all six of the relays on the A6REL-12.
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