5.4 Details of Function Codes
5-226
Hold: During the power-on sequence, the alarm output is kept OFF. Once it goes out of the
alarm range, and comes into the alarm range again, the alarm is enabled.
Latch: Once the monitored quantity comes into the alarm range and the alarm output is turned on,
the alarm will remain on even if it goes out of the alarm range. To release the latch, press
the
key on the keypad or turning the terminal command RST on. Resetting can be
done by the same way as resetting an alarm.
PID Control (Upper Level Alarm (AH)) (J12)
J12 sets the upper limit of the alarm (AH) in percentage (%) of the feedback amount.
PID Control (Lower level alarm (AL)) (J13)
J13 sets the lower limit of the alarm (AL) in percentage (%) of the feedback amount.
The value displayed (%) is the ratio of the upper/lower limit to the full scale (10 V, 20 mA) of the
feedback amount (in the case of a gain of 100%).
Upper level alarm (AH) and lower level alarm (AL) also apply to the following alarms.
Table 5.4-155
How to handle the alarm
Alarm Contents
Select alarm output
(J11)
Parameter setting
Upper limit absolute ON when AH < PV AL = 0
Lower limit absolute ON when PV < AL
Absolute value alarm
AH = 100%
Upper limit deviation ON when SV + AH < PV AL = 100%
Lower limit deviation ON when PV < SV - AL AH = 100%
Upper/lower limit deviation ON when |SV - PV| > AL
Deviation alarm
AL = AH
Upper/lower range limit deviation ON when SV - AL < PV < SV + AL Deviation alarm
Upper/lower range limit absolute ON when AL < PV < AH Absolute-value alarm
Upper/lower range limit deviation ON when SV - AL < PV < SV + AH Deviation alarm
A negative logic
signal assigned to
PID-ALM
J15 to J17
PID Control (Stop Frequency for Slow Flowrate, Slow Flowrate Level Stop Latency
and Starting frequency) (See J08)
For PID control (slow flowrate stop operation frequency level), (slow flowrate level stop latency), and (starting
frequency) functions, see the section describing the function code J08.
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