GE D60 Instruction Manual page 14

1.2 UR OVERVIEW 1 GETTING STARTED
The direct inputs and outputs provide a means of sharing digital point states between a number of UR-series IEDs over
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dedicated fiber (single or multimode), RS422, or G.703 interface. No switching equipment is required as the IEDs are con-
nected directly in a ring or redundant (dual) ring configuration. This feature is optimized for speed and intended for pilot-
aided schemes, distributed logic applications, or the extension of the input/output capabilities of a single relay chassis.
c) UR SCAN OPERATION
The UR-series devices operate in a cyclic scan fashion. The device reads the inputs into an input status table, solves the
logic program (FlexLogic equation), and then sets each output to the appropriate state in an output status table. Any result-
ing task execution is priority interrupt-driven.
Figure 1–3: UR-SERIES SCAN OPERATION
1-4 D60 Line Distance Protection System GE Multilin