Technical / Programming Manual
FT128 Rev 2.2
91
10.6.1.4 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:
10.6.1.5 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.
NOTE! 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 Warning Zone (10)
Explanation: Pre-warning activated in zone 10 will activate the output S0.
Example 2
Output: Relay output R0
Control expression: General Control disabled AND NOT Door Open
Explanation: Controls disabled via menu H2/B7 will activate the output R0
when the door in FT128 is not open (i.e. closed).
Example 3
Output: Voltage output VO0
Control expression: Fire Alarm Zone (23) AND Fire Alarm Zone (24) AND NOT
General Fault
Explanation: Fire alarm activated in zone 23 and zone 24 will activate the
output VO0 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 (10,10,10,19,1) OR Consecutive Fire
Alarm (10,21,10,40,1)
Explanation: Fire alarm activated by one of the alarm points in zone 10
addresses 10-19 or by one of the alarm points in zone 10
addresses 21-40 will activate the output S1 (i.e. the alarm point
in zone 10 address 20 will not activate the output S1).
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