GE D90 Plus - Input and Output Structure

430 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
AUTOMATION CONTROLLER OVERVIEW CHAPTER 8: AUTOMATION
Input and output structure
The figure shows the input and output structure of the D90
Plus
. Three groupings of inputs
and outputs are defined (physical, shared, and virtual), with digital and analog types within
each grouping.
Figure 359: Input and output structure
The digital inputs and outputs have the following characteristics:
• Physical inputs and outputs — The D90
Plus
can accommodate a maximum of five
input and output modules. One module is reserved for protection, allowing up to four
modules to be dedicated to automation, for a maximum of 48 points.
• Shared inputs and outputs — These are internal registers that are accessible to both
the protection and automation functions. This allows protection physical inputs to be
passed to the automation function and vice-versa.
• Virtual inputs and outputs — A total of 96 points are available in the controller for
storage of the intermediate or final results of logic processing (defined as virtual
digital outputs).
The analog inputs and outputs have the following characteristics:
• Physical inputs — These are derived from analog input cards designed to measure
process variables produced by transducers.
• Shared inputs and outputs — These are internal registers that are accessible to both
the protection and automation functions. This allows protection physical inputs to be
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