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13.5.3.4
Parentheses
Changes priority order.
a OR NOT ( b AND c ) = y (This is same as the previous but completed
with parentheses.)
This is shown in the truth table
13.5.3.5
Control expressions
The AND operator has priority, i.e. a AND b OR c = (a AND b) OR c. This is perhaps more
obvious if you write it: a • b + c.
This means that: a AND b OR c ≠ a AND (b OR c).
Here follows some examples (and explanations) to show the principles how to build a
control expression with "conditions" and logical operators.):
Example 1
Output:
Control expression:
Explanation:
Example 2
Output:
Control expression:
Explanation:
Example 3
Output:
Control expression:
Explanation:
Example 4
Output:
Control expression:
Explanation:
Voltage output S0
Pre Alarm Zone (90)
Pre-warning activated in zone no. 90 will activate output S0.
Relay output R1
General Control Off ( ) AND NOT Door Open (01)
Controls OFF (via menu H2/B8) will activate the output R1 when
the door in Control Unit 01 is not open (i.e. closed).
Relay output R0
Fire Alarm Zone (145) AND Fire Alarm Zone (045) AND General
Fault ( )
Fire alarm activated in zone 145 and zone 45 will activate the
output R0 when there are one or more faults in the system at the
same time.
Voltage output S1
Consecutive Fire Alarm (100,10,100,19,1)
OR
Consecutive Fire Alarm (100,21,100,40,1)
Fire alarm activated by one of the alarm points in zone 100
address 10-19 or activated by one of the alarm points in zone
100 address 21-40 will activate the output S1 (i.e. alarm point
address 20 in zone 100 will not activate the output S1).
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Technical/Programming Manual
FT1020G3 Rev 2.2.1
a
b
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
c
y
0
1
1
1
0
1
1
0
0
1
1
1
0
1
1
1
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