VC-6000
TM
Compact monitor Part C Logic Block for relay control
- 70 - C100583.002 Components Vers. 07 © VC-6000
TM
Compact monitor Sept. 2011
22 Logic Block for relay control
22.1 Function
♦ The Logic block is typically used for relay control. The Logic block for
relay control is available in only some instrument configurations.
According to the configuration the relay is controlled by logic selection
criteria (e.g. 2-of-3 redundancy).
When a VIBROCONTROL 6000 Compact monitor has this function this
will be noted in the signal-flow chart of the instrument.
♦ The Logic block is an optional signal path component. A number of
parameters of the Logic block are defined by the monitoring firmware
and cannot be changed by the User Terminal.
♦ A Logic block serves for logic linking of binary status information from
preceding Monitor blocks. The status of the input signals is assessed
according to a laid down logic table. If the logic evaluation gives a
positive output a corresponding event is signalled to the succeeding
signal-flow component at the output of the Logic block. As an example if
a relay succeeds the Logic block, it will be switched by the event.
♦ When a Logic block controls a relay output, the LED at the relay output
module is used for signalling the monitoring status (see the Relay block
chapter in section C and Signalling chapter in section A).
22.2 Typical variants of the Logic block
22.2.1 OR-link
An OR link is used typically for formation of collective alarms.
OR logic (Example with 2 inputs)
Input 1 Input 2 Output Relay position
0
1
0
1
0
0
1
1
0
1
1
1
Normal status
Reporting status
Reporting status
Reporting status
0 = OFF ; 1 = ON
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