BK Vibro VIBROCONTROL 6000 - 2-Of-4 Logic

VC-6000
TM
Compact monitor Part C Logic Block for relay control
- 72 - C100583.002 Components Vers. 07 © VC-6000
TM
Compact monitor Sept. 2011
22.2.4 2-of-4 logic
The 2-of-4 logic is predominantly employed when a high level of
reliability for the signal (and as the case may be for the machine
shut-down) is desired.
2–of–4 logic
Input Output Relay position
1 2 3 4
0
1
0
0
0
1
1
1
1
1
0
0
0
1
0
1
0
0
1
0
0
1
0
0
0
1
1
0
1
1
1
1
0
0
0
1
0
0
1
0
1
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
1
0
1
1
0
1
1
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1
1
Normal status
Normal status
Normal status
Normal status
Normal status
Reporting status
Reporting status
Reporting status
Reporting status
Reporting status
Normal status
Normal status
Reporting status
Reporting status
Reporting status
Reporting status
0 = OFF ; 1 = ON