Alarm Outputs; Alarm Types - Omron E5CN User Manual

Alarm Outputs

3-9

Alarm Outputs

3-9-1

Alarm Types

When I (Integral Time) Is Adjusted
Increased
Set
value
Decreased
Set
value
When D (Derivative Time) Is Adjusted
Increased
Set
value
Decreased
Set
value
• Alarms can be used by the E5CN-@2@@@ (2 alarm points), E5AN/EN-
@1@@@ (1 alarm point), E5AN/EN-@3@@@ (3 alarm points), the E5CN-
@1@@@U (1 alarm point), or the E5CN-@2@@@U (2 alarm points).
Alarm outputs are determined by a combination of "alarm type," "alarm
value," and "alarm hysteresis" alarm output conditions. For details, refer to
4-2 Alarm Hysteresis.
• This section describes the "alarm type," "alarm value," "upper-limit alarm"
and "lower-limit alarm" parameters.
Set value Alarm type
0 Alarm function OFF
1 Upper- and lower-limit
2 (See note Upper-limit
1.)
3 Lower-limit
4 (See note Upper- and lower-limit
1.) range
5 (See note Upper- and lower-limit
1.) with standby sequence
6 Upper-limit with standby
sequence
It takes a long time to reach the set
point.
It takes time to achieve a stable state,
but overshooting, undershooting, and
hunting are reduced.
Overshooting and undershooting occur.
Hunting occurs.
The Controller starts up faster.
Overshooting, undershooting, and sta-
bilization times are reduced, but fine
hunting occurs on changes in the curve
itself.
Overshooting and undershooting
increase, and it takes time to return to
the set point.
Alarm output operation
When alarm value X When alarm value X
is positive
Output OFF
See note 2.
L H
ON
OFF
SP
X
ON ON
OFF OFF
SP
X
ON ON
OFF OFF
SP
See note 3.
L H
ON
OFF
SP
See note 4.
L H
ON
OFF
SP
See note 5.
X
ON
ON
OFF
OFF
SP
Section 3-9
is negative
X
SP
X
SP
X
SP
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