<3. Parameter Setting >
3-24
IM 01C50T01-02EN
3.5.15 Squawk
This feature can be used to identify the
communicating transmitter by remotely causing
LCD to display the particular pattern as shown in
the Figure 3.7.
• Procedure to call up the Squawk display
Device setup → Diag/Sercice → Test Device →
exec Squawk
Select On, Off or Once.
Once: “SQUAWK” continues for approximately
15 seconds, then is released automatically.
F0309.ai
Figure 3.7
LCD Display for Squawk
3.5.16 Output Fluctuation Suppression
Large fluctuations may be output due to sudden
factors such as sensor disconnection or corrosion.
If you want to reduce this fluctuation, please set the
following.
* This feature is available in software revision
R1.04.01 or later.
AO Damp point: 100%
AO Damping: See the following description.
Calculate the time constant that does not reach the
alarm level of the instrumentation system even if
fluctuation occurs during normal operation.
Upper Permissible fluctuation rate
= (High alarm level - Upper control level) /
(PV% upper limit - Upper control level)
Lower Permissible fluctuation rate
= (Lower control level - Low alarm level) /
(Lower control level - PV% lower limit)
The smaller of Upper and Lower permissible
fluctuation rate is Permissible fluctuation rate.
Permissible fluctuation rate
= min (Upper permissible fluctuation rate,
Lower permissible fluctuation rate)
Select and set the time constant for which the
fluctuation rate is smaller than the permissible
fluctuation rate from Table 3.3
Fluctuation rate < Permissible fluctuation rate
Table 3.3
Time constant and Fluctuation rate
Time constant
(s)
Single input
(1 s later)
Dual input
(1.6 s later)
1
55.6%
69.1%
2
36.0%
49.0%
3
26.5%
37.7%
4
21.0%
30.6%
5
17.4%
25.7%
6
14.8%
22.1%
7
12.9%
19.5%
8
11.4%
17.4%
9
10.2%
15.7%
10
9.3%
14.3%
Table 3.4
Glossary
Term
Description
Upper control
level
Maximum value in the operating
range.
For example, When operating at 20%
to 80%, 80% applies.
Lower control
level
Minimum value in operating range.
For example, When operating at 20%
to 80%, 20% applies.
Sudden change The amount of output fluctuation that
occurs due to a sudden factor.
High alarm level Upper level for alarming in the
instrumentation system.
Low alarm level Lower level for alarming in the
instrumentation system.
PV% upper limit Upper limit of PV%. Fixed at 110%.
PV% lower limit Lower limit of PV%. Fixed at -2.5%.
Fluctuation rate Rate of change after one second in
the time constant.
Permissible
fluctuation rate
Fluctuation rate that reaches the
alarm level from the upper and lower
limits of normal operation
Upper
permissible
fluctuation rate
Rate of change from upper control
level to upper alarm level.
Lower
permissible
fluctuation rate
Rate of change from lower control
level to lower alarm level.
Time constant
AO Damping setting value.
