Programmable Logic
Programmable Logic
Available Elements (Equations):
Logics
General Description
The Protective Relay includes programmable Logic Equations for programming output relays, blocking of protective
functions and custom logic functions in the relay.
The logic provides control of the output relays based on the state of the inputs that can be choosen from the
assignment list (protective function pickups, protective function states, breaker states, system alarms, and module
inputs). The user can use the outputs signals of a Logic Equation as inputs in higher equations (e.g. the output
signal of Logic Equation 10 might be used as an input of Logic Equation 11).
Principle Overview
545
MRU4
DOK-HB-MRU4-2E
Input1
Input2
Input3
Input4
Reset Latched
Inverting settable
Inverting settable
Inverting settable
Inverting settable
AND
OR
NAND
NOR
Inverting settable
Inverting settable
Gate Out
Timer Out
Out
Out inverted
Set
Reset
Type of logic gate selectable
S
R1
Q
Q
t-On Delay
Delay Timer
t-Off Delay
