Operation Techniques
95
Example 4-6 Sample Of Limited Data Recording
Trigger conditions
Conjunction
Trigger parameter
Condi-
tion
Operate
limit
Release
limit
Condition #1
OR
Timer #4
Condition #2
AND
Counter #1
≤
99
99
Setpoint actions
Delays
Action type
Action target
Unit
Operate Release
Action #1
Data logging
#12
0.1 s
0
0
Action #2
INC counter
#1
Gated Setpoint Operations with Interval Timer
Example 4-7
illustrates how to change the previous example to provide time-gated
recording data for the predefined time on a certain day.
The setpoint will provide recording data every 20 second (assuming that the timer
interval the same as in
Example 4-5
) on the 12th Aug., 1997, from 08:30:00 to
17:15:00.
Example 4-7 Sample Of Repeated Time-Gated Operations
Trigger conditions
Conjunction
Trigger parameter
Condi-
tion
Operateli
mit
Releaseli
mit
Condition #1
OR
Timer #4
Condition #2
AND
Date
=
970812
Condition #3
AND
Time
≥
083000
Condition #4
AND
Time
≤
171500
Setpoint actions
Delays
Action type
Action target
Unit
Operate Release
Action #1
Data logging
#12
0.1 s
0
0
In the same way, you can use (instead of time) any numeric or logical trigger to
provide periodical condition-gated operations. The following example illustrates
generating pulses through relay output #1 with a 0.5 second width repeated each 1
second, to provide a flashing alarm signal when real-time total active power
through
load exceeds 20200 kW (see
Example 4-8
). Interval timer #1 is assumed to be
configured for a 1 second count interval.
