5-54
5-12-5
PV deviation alarm
The PV deviation alarm monitors the PV deviation from the SP value. The deviation alarm has two programmable thresholds,
each of which applies the same deviation above and below the configured SP value. In the figure below, the alarm with the
lowest deviation is called the "deviation (yellow)" to show the caution status of PID control. The alarm with the larger deviation
is called the "deviation (red)", indicating that the PID control error condition is severe. The threshold occupies control
parameter table positions R+17 and R+20 as shown below.
These thresholds define zones of variation from the SP
value. The green zone between the SP values indicates
the safety condition (no alarm). The yellow zone is
outside the green zone, and the red zone is further outside
these zones.
The PV deviation alarm is PID as shown to the right.
The two bits of the mode and alarm position are reported.
It is recommended to use a ladder circuit to monitor these
bits. It is easy to use bit manipulation instructions for
words. In addition, you can monitor PID alarms by using KPP.
The PV deviation alarm can be enabled or disabled independently of other PV alarms using bit 13 of PID mode setting 1 R +00.
The alarm hysteresis function operates in conjunction with both the deviation alarm and the absolute value alarm. This is
explained at the end of this section.
Note: DirectSOFT4 and DirectSOFT5 are not supported.
Be sure to use KPP Ver1. 5.0.0 or higher.
0
1
3
4
5
6
7
8
9
10
11
12
13
14
15
2
偏差アラーム(黄)
偏差アラーム(赤)
PID
モードとアラーム状態ワード:
R
+
06
ビット
SP
Y
R+17
XXXX
R+20
XXXX
Y
偏差アラーム(赤)
偏差アラーム(黄)
偏差アラーム(黄)
偏差アラーム(赤)
赤
黄
緑
黄
赤
ループテーブル
偏差アラーム(黄)
偏差アラーム(赤)
Red
Deviation alarm (Red)
Deviation alarm
(Yellow)
Deviation alarm
(Yellow)
Deviation alarm (Red)
Red
Yellow
Yellow
Green
Loop table
PID mode and alarm state word
Deviation alarm (Yellow)
Deviation alarm (Red)
Deviation alarm (Yellow)
Deviation alarm (Red)
Bit
Summary of Contents for Kostac SJ-Ether Series
Page 1: ...English version of the KOSTAC SJ Ether series user s manual SJ ETHER USER M...
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Page 13: ...1...
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Page 113: ...3 24 Note Refer to 6 3 3 Module Assembly for connections and locks between modules...
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Page 156: ...flashing OFF Not sent H W RX Green flashing Receiving H W OFF Not received H W...
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Page 310: ...Chapter 7 Maintenance...
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