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Title: Microprocessor Based Supervisory Control And Data Acquisition
Author: Jim Russell
Source: 1982 Appalachian Gas Measurement Short Course
Year Published: 1982
Abstract: The technology of SCADA remote terminal design Is at a very difficult time in its evolution. There is enough history to provide some tradition and de-facto standards. Yet, this history has been compiled with circuit components and concepts that are today completely obsolete. In the past, a remote terminal was simply a means of extending the master CPUs I/O to a remote location. The traditional functions are to: 1. Communicate reliably With the master 2. Provide secure field interface for a. Status/Alarms (contact closure) b. Meter Counting (contact closure) c. Analog Measurement (4-20 ma) d. Digital Control (contact closure) e. Analog Setpoint (4-20 ma) These traditional functions are important. In fact, without full and proper implementation of these functions there is no basis for a SCADA remote terminal.

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