Automation; Automation Automation Controller Overview - GE D90 Plus Instruction Manual

D90
Chapter 8: Automation
Automation controller overview
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Plus
Line Distance Protection System

Automation

This section describes how to program the D90
Plus
The D90 automation controller allows the user to easily implement a variety of custom
automation schemes. The controller can access both digital and analog inputs and
outputs. Operations carried out on digital inputs and outputs are referred to as logical
operations, whereas operations carried out on analog inputs and outputs are referred to
as math operations. Digital inputs and outputs include physical inputs and outputs residing
Plus
locally in the D90 , remote inputs and outputs originating in external devices, and
outputs generated by internal, hard-coded functions. The results of processing inputs and
outputs are stored locally in the form of virtual inputs and outputs. These may, in turn, be
assigned to drive contact outputs, annunciator indications, or be used as inputs to internal,
hard-coded functions. They are also available via communications to external devices or
master programs.
All inputs are read at the beginning of the automation scan, then the logic is processed.
After logic processing, the outputs are written. The D90
A total of 4096 lines can be programmed in the automation controller.
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automation features.
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Figure 294: Automation scan
automation scan rate is 50 ms.
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