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FX2N-2LC Temperature Control Block
7.2.32
In BFM #50, set the loop breaking alarm dead zone of CH1.
In BFM #69, set the loop breaking alarm dead zone of CH2.
The loop breaking alarm function may issue alarms caused by disturbances (effect of another
heat source, etc.) even if there is no abnormality in the control system. In order to prevent
such alarms, by setting the loop breaking alarm dead zone, the region in which the alarm func-
tion is disabled (non-alarm status region) can be set.
For example, if the loop breaking alarm dead zone is set to "10
°
(SV) and 10
C below the set value (SV) are treated as the non-alarm status region (width of 20
°
C in total).
While the measured value (PV) is located within the non-alarm region, alarm is not issued
even if the alarm condition is satisfied.
The allowable set range is form 0.0 (or 0) to the input range span (
When BFM #50 / #69 is set to "0", the loop breaking alarm dead zone function is disabled.
LBD operation gap *3
Alarm status region
Low
*1 While the temperature is rising: Alarm status region
While the temperature is decreasing: Non-alarm status region
*2 While the temperature is rising: Non-alarm status region
While the temperature is decreasing: Alarm status region
*3 LBD operation gap (0.01%FS)
Non-alarm status region
*1
Temperature set value (SV) LBD set value
Buffer Memory (BFM) 7
°
°
C", 10
C above the set value
°
°
C or
F).
LBD operation gap *3
*2
Alarm status region
High
7
7-21
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