E5jK-T
E5jK-T
31
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
Alarm operation
Alarm output
setting
When X is positive When X is negative
1
Upper- and lower-limit alarm (deviation)
XX
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)
XX
SP
ON
OFF
Always OFF
5 Upper- and lower-limit alarm with standby
sequence
(deviation)
XX
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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