5
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation
IM 77J01Q08-01E
9. DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the following conditions.
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1
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4
[%]
0
20
15
40
60
80
100
[1]
[2]
[3]
[4]
1 sec.
2 sec.
3 sec.
4 sec.
Alarm-2 hysteresis (5%)
Alarm-1 hysteresis (10%)
Alarm-1 setpoint (80%)
Alarm-2 setpoint (15%)
Elapsed time
1 sec.
Alar
m-1 ON dela
y
Alar
m-1 OFF dela
y
Alar
m conditions
estab
lished
Alar
m conditions
estab
lished
Nor
mal conditions
estab
lished
Nor
mal conditions
estab
lished
Lo
w-limit alar
m ON
Lo
w-limit alar
m OFF
Alar
m-2 ON dela
y
Alar
m-2 OFF dela
y
[1]: Alarm status does not continue for more than 1 second after the
alarm conditions are established at alarm-1.
[2]: Normal status does not continue for more than 2 seconds after the
normal conditions are established at alarm-1.
[3]: Alarm status does not continue for more than 3 seconds after the
alarm conditions are established at alarm-2.
[4]: Normal status does not continue for more than 4 seconds after the
normal conditions are established at alarm-2.
Alar
m conditions estab
lished
Alar
m conditions estab
lished
High-limit alar
m ON
High-limit alar
m OFF
Nor
mal conditions estab
lished
Nor
mal conditions estab
lished
Alarm-1 action
Alarm-2 action
Alarm
Normal
Normal
Normal
Alarm
Normal
10.TIMING CHART OF PULSE INTEGRATION OPERATION
This timing chart shows an example of the integration operation where input frequency is 0 to 10 Hz and sampling time is 2 sec.
10%
2 sec
0%
OFF
ON
ON
ON
ON ON ON ON
ON
ON
Input pulse
Analog output
Sampling interval
5%
5%
20%
