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Technical/Programming Manual
FT1020G3 Rev 2.2.1
93
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:
Voltage output
S0
Control expression:
Pre Alarm Zone (90)
Explanation:
Pre-warning activated in zone no. 90 will activate output S0.
Example 2
Output:
Relay output
R1
Control expression:
General Control Off ( )
AND
NOT
Door Open (01)
Explanation:
Controls OFF (via menu H2/B8) will activate the output R1 when
the door in Control Unit 01 is not open (i.e. closed).
Example 3
Output:
Relay output
R0
Control expression:
Fire Alarm Zone (145)
AND
Fire Alarm Zone (045)
AND
General
Fault ( )
Explanation:
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.
Example 4
Output:
Voltage output
S1
Control expression:
Consecutive Fire Alarm (100,10,100,19,1)
OR
Consecutive Fire Alarm (100,21,100,40,1)
Explanation:
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).
a
b
c
y
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
0
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1
Содержание Firetracker FT1020G3 CIE
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Страница 187: ...Technical Programming Manual FT1020G3 Rev 2 2 1 184 Figure 60 FT1020G3 General arrangement ...
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