Omron E5xK-T series Manual page 31

E5jK-T
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)."
Alarm operation
Switch
setting setting
1 Upper- and lower-limit alarm (deviation)
2 Upper-limit alarm (deviation)
3 Lower-limit alarm (deviation)
4 Upper- and lower-limit range alarm (deviation)
5 Upper- and lower-limit alarm with standby
sequence (deviation)
6 Upper-limit alarm with standby sequence
(deviation)
7 Lower-limit alarm with standby sequence
(deviation)
8 Absolute-value upper-limit alarm
9 Absolute-value lower-limit alarm
10 Absolute-value upper-limit alarm with standby
sequence
11 Absolute-value lower-limit alarm with standby
sequence
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.
Alarm value
10 C/ F
Set point (SP)
100 C/ F
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
110 C/ F
Alarm output
When X is positive
X X
SP
X
SP
X
SP
X X
SP
X X
SP
X
SP
X
SP
X
0
X
0
X
0
X
0
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
E5jK-T
When X is negative
Always ON
X
ON
OFF
SP
X
ON
OFF
SP
Always OFF
Always OFF
X
ON
OFF
SP
X
ON
OFF
SP
X
ON
OFF
0
X
ON
OFF
0
X
ON
OFF
0
X
ON
OFF
0
Alarm value
110 C/ F
110 C/ F
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