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LBA
The LBA (loop break alarm) function is available when it is assigned
as an output. The LBA function is not available when a memory or
A/D converter error results.
LBA is a function for determining that an error has occurred some-
where on the control loop and outputting an alarm when the process
value does not change with the manipulated variable at a maximum
or minimum state. Accordingly, the LBA function can be used as a
means for detecting a malfunctioning control loop.
Alarm Mode Selectors
Alarm outputs are available if they are allocated as outputs. Factory setting is “2: Upper-limit alarm (deviation).”
Switch
setting
Alarm operation
Alarm output
setting
When X is positive
When X is negative
1
Upper- and lower-limit alarm (deviation)
X
X
ON
OFF
SP
Always ON
2
Upper-limit alarm (deviation)
X
SP
ON
OFF
X
SP
ON
OFF
3
Lower-limit alarm (deviation)
X
SP
ON
OFF
X
SP
ON
OFF
4
Upper- and lower-limit range alarm (deviation)
X
X
SP
ON
OFF
Always OFF
5
Upper- and lower-limit alarm with standby
sequence (deviation)
X
X
SP
ON
OFF
Always OFF
6
Upper-limit alarm with standby sequence
(deviation)
X
SP
ON
OFF
X
SP
ON
OFF
7
Lower-limit alarm with standby sequence
(deviation)
X
SP
ON
OFF
X
SP
ON
OFF
8
Absolute-value upper-limit alarm
X
0
ON
OFF
0
X
ON
OFF
9
Absolute-value lower-limit alarm
X
0
ON
OFF
0
X
ON
OFF
10
Absolute-value upper-limit alarm with standby
sequence
X
0
ON
OFF
0
X
ON
OFF
11
Absolute-value lower-limit alarm with standby
sequence
X
0
ON
OFF
0
X
ON
OFF
Deviation Alarm
If the alarm mode selector is set to a number between 1 to 7, alarm
values are set to the width deviated from the set point as shown in
the following illustration.
Set point (SP)
100
°
C/
°
F
Alarm value
10
°
C/
°
F
110
°
C/
°
F
Absolute Alarm
If the alarm mode selector is set to 8 or 9, alarm values are set to the
absolute value based on 0
°
C/
°
F as shown in the following illustra-
tion.
0
°
C/
°
F
Alarm value
110
°
C/
°
F
110
°
C/
°
F
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