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C
PID M
ONFIGURING
ODULE USING
Upper/Lower Limits Alarm with Standby
ON
OFF
Alarm Value
[Setting Example]
Set Point (SP)
Alarm 1 Value
Alarm 1 Hysteresis
[Alarm Action]
205
C
Process Variable (PV)
197 C
ON
OFF
: Standby functions.
Notes:
· When the set point (SP) is changed, the standby function is enabled. Once the process variable (PV)
enters the alarm output off range, the standby function is canceled.
· Even when an alarm output is triggered, the PID module continues its control. To stop the control when an
alarm is triggered, ladder programming is needed. For a ladder program example, see 7-6.
(7) Control Register+37: Alarm 1 Value
Control Register+38: Alarm 2 Value
Control Register+39: Alarm 3 Value
Control Register+40: Alarm 4 Value
Control Register+41: Alarm 5 Value
Control Register+42: Alarm 6 Value
Control Register+43: Alarm 7 Value
Control Register+44: Alarm 8 Value
There are two types of alarms: Deviation alarm and process alarm.
Upper/Lower limit range alarm
Upper limit alarm,
Deviation
Lower limit alarm,
Alarm
Upper/Lower limits alarm,
Upper limit alarm with standby,
Lower limit alarm with standby,
Upper/Lower limits alarm with
standby
Process
Process high alarm
Alarm
Process low alarm
When the alarm value is 0, the alarm action is disabled except process high alarm and process low alarm.
If the input type or input unit type is changed, confirm the valid range of the alarm value and configure
appropriate values.
6-28
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W
LDR
IND
Alarm Hysteresis
SP
Alarm Value
: 200 C
: 5 C
: 2.0
C
Process Variable (PV) or
195
C
: Alarm Output ON
Process Variable (PV) 203
C
: Alarm
Output OFF
5
5
C
C
2.0
2.0
C
C
195
197
C
200
C
203
205
C
C
C
Alarm Type
Alarm Value
Deviation from the set
point (SP) is the alarm
value.
The alarm action point is
the alarm value.
FC5A MicroSmart PID Module User's Manual FC9Y-B1283
Alarm Action
The alarm output turns off if the
process variable (PV) exceeds
the range.
The alarm output turns on if the
process variable (PV) exceeds
the range.
The alarm output turns on if the
process variable (PV) exceeds
the alarm value.
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