BK Vibro VIBROCONTROL 6000 - 3-Of-4 Logic; Logic Block Status Display

Logic Block for relay control Part C VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 73 -
22.2.5 3-of-4 logic
The 3-of-4 logic is predominantly employed when a high level of
reliability for the signal (and as the case may be for machine
shut-down) is desired.
3–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
0
0
0
1
1
0
0
1
1
1
1
Normal status
Normal status
Normal status
Normal status
Normal status
Normal status
Normal status
Normal status
Reporting status
Reporting status
Normal status
Normal status
Reporting status
Reporting status
Reporting status
Reporting status
0 = OFF ; 1 = ON
22.3 Logic block status display
In addition to pure logic linking, the Logic block also has a status display for
the conditions 'Trip over-ride (TO)' and 'Acknowledge (ACK).
These stati are formed through the logic linking from the status of the
previous Monitor or Binary-input blocks. The results of these logic links are
displayed by a status parameter in the UT-100 User Terminal.
The displayed status corresponds to the flashing pattern of the LEDs on the
Relay-output module. (Compare chapter 8.3.3 in section A.)