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8. Explanation of Functions
All the details are mentioned here except the explanation of 5-5. Procedure of Setting in Screen Group 0.
8-1. Events
(1) Deviation alarm
An alarm action point is set by a deviation from target set value (SV).
For example, when the target set value is 20°C, +10°C should be set for higher limit deviation alarm in order to put an
alarm in action at 30°C and higher.
To put an alarm in action at 30°C and lower when the target set value is 100°C, í70°C should be set for higher limit
deviation alarm.
Higher limit deviation alarm must be higher than the target set value and lower limit deviation alarm must be lower
than the target set value.
This is conveniently used to make the alarm action point follow deviation from the target set value. The setting range
will be í1999 to 2000 digit.
(2) Absolute value alarm
An alarm action point is set by an absolute value.
For example, 50°C should be set for higher limit absolute alarm in order to put an alarm in action at 50°C and higher.
To put an alarm in action at 20°C and lower, 20°C should be set for lower limit absolute alarm.
Both higher limit and lower limit can be set at any value within the measuring range.
This alarm is convenient when the alarm action point is fixed.
(3) Standby action
In case the event standby action is set at 2 or 3 (on the screen 1-23 or 1-26), the alarm withholds its action even if the
PV value is in the event action range (ON range) when the power is applied, when the setting value is changed, or
when the standby is released.
The alarm will go on once the PV value leaves the event action range, the standby action is released, and the PV
value enters the event action range again.
(4) No-standby action
In case the event standby action is set at 1 or 4 (on the screen 1-23 or 1-26), the alarm is output when the PV value
enters the event action range, regardless of whether the power is applied, the SV changed, or the standby released.
(5) Control mode
In case the event standby action is set at 4 (on the screen 1-23 or 1-26), alarm is not output when scaleover has
occurred or when the controller is in standby.
8-2. Selection of Event Standby Action Code
This is additional description for the explanation in 1-23 event 1 standby action code setting screen of the screen
group 1.
The 1-26 event 2 standby action code setting screen is the same.
ۑ
1
Select a code from 1, 2 or 3 of the standby action code table when event output is used as an alarm.
ۑ
2
Select 4 when event output is used for control. Note, however, that setting 4 will not let event output ON even
when the input error has occurred.
ۑ
3
When 2 is set, the standby function is in action when power is applied or when standby is released.
ۑ
4
When 3 is set, the standby function is in action when power is applied, when standby is released, or when SV in
execution is changed.
ۑ
5
A change to 1 or 4 while standby action is in execution, the standby action will be released immediately.
When power is supplied and if a PV value is out of a range in which an event action is ON, standby action
becomes invalid even when 2 or 3 has been set for standby action.
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