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

Line distance protection system

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Table of Contents

Chapter 8: Automation

Automation controller overview

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Line Distance Protection System

Automation

This section outlines how to program the D90

automation controller allows 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 locally in the D90

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 can, 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.

automation features.

Figure 358: Automation scan

, remote inputs and

automation scan rate is 50 ms.