Logic Diagrams; Figure 1: Key To Logic Diagrams - GE MiCOM P40 Agile Technical Manual

Chapter 1 - Introduction
5

LOGIC DIAGRAMS

This technical manual contains many logic diagrams, which should help to explain the functionality of the device.
Although this manual has been designed to be as specific as possible to the chosen product, it may contain
diagrams, which have elements applicable to other products. If this is the case, a qualifying note will accompany
the relevant part.
The logic diagrams follow a convention for the elements used, using defined colours and shapes. A key to this
convention is provided below. We recommend viewing the logic diagrams in colour rather than in black and white.
The electronic version of the technical manual is in colour, but the printed version may not be. If you need coloured
diagrams, they can be provided on request by calling the contact centre and quoting the diagram number.
Key:
Energising Quantity
Internal Signal
DDB Signal
Internal function
Setting cell
Setting value
Hardcoded setting
Measurement Cell
Internal Calculation
Derived setting
HMI key
Connection / Node
Switch
Switch
Bandpass filter
V00063

Figure 1: Key to logic diagrams

10
AND gate
OR gate
XOR gate
NOT gate
Logic 0
Timer
Pulse / Latch
SR Latch
SR Latch
Reset Dominant
Latched on positive edge
Inverted logic input
Soft switch
Multiplier
Comparator for detecting
undervalues
Comparator for detecting
overvalues
P14D
&
1
XOR
0
S
Q
R
S
Q
R
D
1
2
X
P14D-TM-EN-8