9
Lower limit alarm (ALM2) setting (option)
(Setting is possible within input range)
[Description]
• Alarm is not displayed without
lower limit alarm function.
• When input or deviation is smaller
than AL, or when deviation is larger
than AL, alarm output turns ON.
• When using lower limit alarm, it is
necessary to set alarm type (see pa-
rameter P-AL) and appropriate
code.
• When lower limit alarm with hold
function is used, lower limit alarm
does not turn ON even it the input is
smaller than AL (see diagram (c)
below).
• When it is the range alarm and in-
put or deviation is smaller than AL,
the alarm output turns OFF (see dia-
gram (b) below).
• Selection between absolute value
alarm and deviation alarm is made
by P-AL.
• Alarm action hysteresis can be set
by No. 2 block parameter P-An.
Related parameter: P-AH (Page 30)
P-AL (Page 30)
P-An (Page 28)
Example) Altering the lower limit alarm of 200
°
C to 100
°
C
Key operation
Description
Press the SEL key to display P.
Press the SEL key repeatedly until
is displayed.
Press the or key to display
100.
Press the DATA key once.
Current lower limit alarm value
(200
°
C) is displayed.
Press the SV key when you need to
display the operation status display.
Press the ENT key, then the lower
limit alarm value is registred.
Operation is started with 100
°
C of
lower limit alarm.
Display
SEL
ENT
SV
DATA
SEL
ON
ON
ON
(a)
(b)
(c)
SV
PV value
AL
AL
Absolute value alarm
Deviation alarm
SV
SV
0
OFF
Hysteresis
Hysteresis
Power ON
Not turn ON with lower limit
hold functuion
OFF
t
t
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