SDM-CD8S Eight-Channel Solid-State DC Controller
Expands Datalogger Control Capacity
For dc devices with moderate current loads
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Overview

The SDM-CD8S adds capability to a datalogger by controlling dc devices that have a moderate current load, such as solenoids, solenoid valves, dc motors, stepper motors, lights, horns, heaters, and fans. The SDM-CD8S is targeted for applications requiring only a few control ports and where a larger, high-powered relay module (such as the SDM-CD16S) is not necessary.

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Benefits and Features

  • Provides a manual override
  • Enables multiple SDM-CD8S devices to be wired to one data logger, increasing the number of devices that can be controlled
  • Includes LEDs that provide a visual indicator of active outputs

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Detailed Description

The SDM-CD8S has eight dc-voltage outputs and returns that can be switched on and off manually or under datalogger control. When the manual control switch is in the ON position, outputs are controlled by the position of the individual rocker switches. In the OFF position the state of the relays is controlled by the SDM commands from the datalogger.

The voltage range for this device is 8 to 26 Vdc. It can deliver up to 1 A per channel with a maximum of 6 A total for all channels. The power Input (8 to 26 Vdc) powers both the outputs and the SDM-CD8S logic.

SDM Operation

The SDM-CD8S is a synchronously addressed datalogger peripheral. Datalogger control ports 1, 2, and 3 are used to address the SDM-CD8S, then clock out the desired state of each of the 8 control ports. Up to 15 SDM-CD8S Controllers may be addressed, making it possible to control a maximum of 120 ports from the first three datalogger control ports.

 

Specifications

Function Allows the data logger to control dc devices that have a moderate current load, such as solenoids, solenoid valves, dc motors, stepper motors, lights, horns, heaters, and fans.
Number of Channels 8
Supply Voltage Range 8 to 26 Vdc
Operating Voltage 12 Vdc
Logic Current Drain (@ 12 Vdc)
  • 15 mA (quiescent)
  • 2.5 mA per active LED (manual or auto)
Toggle Switch
  • MANUAL, OFF, AUTO
  • Individual dip switches for manual
Maximum Current
  • 1 A (per channel)
  • 6 A (all channels total)
Actuation/Release Times 8 μs/200 μs
Operating Temperature -40° to +70°C
Dimensions 11.1 x 8.6 x 2.4 cm (4.4 x 3.4 x 0.9 in.)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000 (retired)
CR1000X
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR295X (retired)
CR3000 (retired)
CR6
CR800 (retired)
CR850 (retired)
CR9000 (retired) Although the CR9000 is compatible, the SDM-CD8S 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-CD8S does not support its fastest communication rates and therefore is not practical for most of its applications.

Mounting Equipment

Product Compatible Note
ENC10/12
ENC10/12R
ENC12/14
ENC14/16
ENC16/18
ENC24/30
ENC24/30S

Distributed Data Acquisition

Product Compatible Note
Granite 10
Granite 6
Granite 9

Additional Compatibility Information

Data Logger Considerations

Up to 15 SDM devices can be connected to a single data logger. 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.

Power Considerations

The SDM-CD8S power requirements may be large compared to most Campbell Scientific products. For most applications, an external power supply is recommended to power the SDM-CD8S.

For some applications, it may be convenient to use the data logger’s sealed-rechargeable battery. If the data logger’s rechargeable batteries are used, the batteries need to be float charged via a wall charger or solar panel. The current available from the wall charger limits the SDM continuous output current. Campbell Scientific does not recommend using the data logger’s alkaline power supply.

Enclosure Considerations

The SDM-CD8S 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.

Casos de estudio

Utah: Water-Supply SCADA System
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Articles and Press Releases

Listed Under

Common Accessory for the following products:
Replacement Part for the following products: