Basic circuits, Significance of logic values, Basic circuits -23 – AB Soft PicoTM Controller 1760 User Manual
Page 49
Publication 1760-GR001C-EN-P - April 2005
Drawing a Circuit with Pico 2-23
Basic Circuits
Significance of Logic Values
Negation (NOR)
Permanent Contact (Unconditional Rung)
Flip-Flop Output
Value
Function
“0”
Make contact open, break contact closed, relay coil not energized
“1”
Make contact closed, break contact open, relay coil energized
I1
Q1
1
0
0
1
---
Q1
1
1
I1
State Q1
Q1
0
0
0
0 to
1
0
1
0
1
1
0 to
1
1
0
I1---------{Q1
-----------{Q1
I1---------
Q1