Alarm Outputs; Alarm Types - Omron E5C series User Manual

4-10 Alarm Outputs

• You can use alarms on models with auxiliary outputs. For relay outputs or voltage outputs (for driving
SSRs), alarms can also be used by setting the Control Output 1 Assignment or Control Output 2
Assignment parameter to any of the alarms from alarm 1 to 4. The alarm output condition is
determined by a combination of the alarm type, alarm value, alarm hysteresis, and the standby
sequence. For details, refer to 4-11 Alarm Hysteresis.
• This section describes the Alarm Type, Alarm Value, Upper-limit Alarm and Lower-limit Alarm
parameters.

4-10-1 Alarm Types

alt1
Alarm 1 Type
alt2
Alarm 2 Type
alt3
Alarm 3 Type
alt4
Alarm 4 Type
Set
value
0
1
2
(default)
3
E5@C Digital Temperature Controllers User's Manual (H174)
• Set the alarm type independently for each alarm in the Alarm 1 to 4 Type
parameters in the Initial Setting Level.
• The alarms that can be set are listed in the following table.
• You can use an LBA (12) only for alarm 1. You cannot use an LBA on a
Position-proportional Model.
Alarm type
When alarm value
X is positive
Alarm function
OFF
Upper- and
ON
lower-limit*1
OFF
Upper-limit
ON
OFF
Lower-limit
ON
OFF
Alarm output operation
When alarm value
X is negative
Output OFF
*2
L H
PV
SP
X X
ON
PV OFF
SP SP
X X
ON
PV OFF
SP SP
4 Basic Operation
Description of function
No alarm
Set the upward deviation in
the set point for the alarm
upper limit (H) and the
lower deviation in the set
point for the alarm lower
limit (L). The alarm is ON
when the PV is outside this
deviation range.
Set the upward deviation in
the set point by setting the
PV
alarm value (X). The alarm
is ON when the PV is higher
than the SP by the deviation
or more.
Set the downward deviation
in the set point by setting
PV
the alarm value (X). The
alarm is ON when the PV is
lower than the SP by the
deviation or more.
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