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Related Manuals for Campbell SDM-CD16AC
Summary of Contents for Campbell SDM-CD16AC
- Page 1 Revision: 08/2021 Copyright © 1987 – 2021 Campbell Scientific, Inc.
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Page 2: Table Of Contents
Table of contents 1. Introduction 2. Control specifications 3. Power considerations 4. Installation 4.1 Wiring 4.1.1 SDM-CD16AC power and control connections 4.1.2 Controlled device to SDM-CD16AC connections 4.1.3 Motor control 5. Address selection switches 6. Data logger programming 6.1 CRBasic programming 6.1.1 SDMCD16AC() instruction... -
Page 3: Introduction
The SDM-CD16AC is a synchronously addressed data logger peripheral. Three ports on the data logger 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 three data logger ports. -
Page 4: Control Specifications
1 A at 30 VDC, 3 A at 125 VAC, 2 A at 250 VAC Coil voltage: 11 to 18 VDC Coil resistance: 360 Ohms ±10% Expected life (contact closures): Mechanical 10 Actuation/release time: Approx. 4 ms Standards: Underwriters Laboratories (UL) listed product (E162021) Canadian Underwriters Laboratories (CUL) listed product (5Z21) SDM-CD16AC 16 Channel AC/DC Controller... -
Page 5: Power Considerations
(p. 3)). For long-term applications, the lead acid power supply available with Campbell Scientific data loggers should be used, allowing the batteries to be float charged. It is not recommended that the data logger alkaline supply be used to power the SDM-CD16AC for long-term applications due to its large power requirements. -
Page 6: Installation
A 0.3 m (1 ft) cable length should be sufficient when both data logger and SDM-CD16AC are housed within an ENC12/14; a 0.6 m (2 ft) length may be required if the data logger and SDM-CD16AC are housed at opposite ends of an EN16/18 enclosure. -
Page 7: Wiring
Refer to FIGURE 3-1 (p. 3) and Table 4-1 (p. 5) for SDM-CD16AC operating power and control connections to the data logger. Table 4-1: Data logger to SDM-CD16AC connections (see caution) Data Logger Connection Order SDM-CD16AC Function (see notes) 12 V on data logger or... -
Page 8: Motor Control
(OFF) FIGURE 4-1. Switch operation In most applications, the SDM-CD16AC acts as a switch (controllable break) in one wire of the circuit powering the controlled device. One side of this break may have power (hot). FIGURE 4-2 (p. -
Page 9: Address Selection Switches
FIGURE 4-3. SDM-CD16AC relay outputs to MCC 5. Address selection switches Each SDM-CD16AC can have 1 of 16 addresses. Shipped from the factory, the address is set at 00. The following table shows switch position and the corresponding address (see FIGURE 5-1 (p. -
Page 10: Data Logger Programming
6. Data logger programming In CRBasic, the SDMCD16AC() instruction is used to control the SDM-CD16AC. Data loggers that are programmed with CRBasic include the CR6, CR3000, CR1000X, CR800, CR850, and CR1000. SDMSpeed() instruction should also be used if the cable length is longer than 20 ft. -
Page 11: Crbasic Programming
Syntax SDMCD16AC(Source, Reps, SDMAddress) Remarks A port on an SDM-CD16AC is enabled/disabled (turned on or off) by sending a value to it using SDMCD16AC() instruction. A non-zero value will enable the port; a zero value disables it. The values to be sent to the CD16AC are held in the Source array. -
Page 12: Theory Of Operation
The data logger shifts out a data bit on C1 (LSB first) on the falling edge of the C2 clock. The SDM-CD16AC shifts in the C1 data bit on the rising edge of the C2 clock. The first 8 bits clocked out represent the SDM-CD16AC address. If the address matches the SDM-CD16AC address, the SDM-CD16AC is enabled. -
Page 13: Program Examples
SDM-CD16ACs, controlling temperature and fans in greenhouses, and using an integer instead of an array to set the SDM-CD16AC control outputs. While the programs are written for the CR1000X, they will work with other Campbell Scientific data loggers with little or no modification. - Page 14 SDMCD the CD16_Output bits set the SDM-CD16AC ports. bits 0 to 4 are for ‘Heat, 5 to 9 are for Cooling, 10 to 14 are for Fans Program SDM-CD16AC_greenhouse-control.dld uses an array of values to set the SDM-CD16AC control outputs.
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