Remote data acquisition and control system
September 2002
Data Acquisition & Telemetry
The ADAM 4000 Series modules from Advantech are compact and versatile sensor-to-computer interface units for reliable operation in harsh environments. Their built-in microprocessors in rugged industrial grade plastic housings allow them to provide independent intelligent signal conditioning, analog I/O, digital I/O, data display and RS485 communication.
Only two wires are required to allow ADAM modules to communicate with the controlling host computer over a multidrop RS485 network. Their ACSII-based command/response protocol ensures compatibility with virtually any computer.
The modules are capable of accommodating multiple types and ranges of analog input. Both type and range can be selected remotely by issuing commands from the host computer. By using only one type of module from the ADAM 4000 range, the measurement needs of an entire plant can be achieved.
The ADAM 4000 Series analog input modules use microprocessor-controlled high resolution, 16-bit, sigma-delta A/D converters to acquire sensor signals such as voltage, current, thermocouple or RTD. Analog data is translated into engineering units, % of FSR, two's complement or ohms. After the modules receive a request from the host, they send the data in the desired format over the RS485 network.
Certain modules feature digital inputs and outputs that also may be used for alarm and event counting. The analog input module's two digital output channels are open collector transistor switches that the user can control from the host computer. By switching solid-state relays the output channels can control heaters, pumps and other power equipment.
On-board event counters can count up to 65 535 transitions occurring on the digital input. The counter can be read and cleared by the host computer and can be used in production line applications to keep records of repetitive operations. ADAM 4000 Series modules may be DIN rail or wall mounted and can be piggybacked to save space. Various modules are available to provide a total solution for analog and digital I/O.
For more information contact Elton Prytz, ProMicro, 011 706 7913, [email protected], www.promicro.co.za
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