Deadband Supervision - ABB 615 series Technical Manual

Section 3
Basic functions
3.13.2.8
118
Y
Value maximum
Val high high limit
Val high limit
AI_RANGE#=0
Val low limit
AI_RANGE#=2
Val low low limit
AI_RANGE#=4
Value minimum
GUID-6A6033E6-22C8-415D-AABD-D0556D38C986 V1 EN
Figure 31: Limit value supervision for RTD
The range information of "High-high limit" and "Low-low limit" is combined from all
measurement channels to the Boolean ALARM output. The range information of "High
limit" and "Low limit" is combined from all measurement channels to the Boolean
WARNING output.
Table 54: Settings for RTD analog input limit value supervision
Function
RTD analog input
When the measured value exceeds either the Value maximum setting or the Value
minimum setting, the corresponding quality is set to out of range and a maximum or
minimum value is shown when the measured value exceeds the added hysteresis,
respectively. The hysteresis is added to the extreme value of the range limit to allow the
measurement slightly to exceed the limit value before it is considered out of range.

Deadband supervision

Each input has an independent deadband supervision. The deadband supervision function
reports the measured value according to integrated changes over a time period.
Out of Range
AI_RANGE#=3
Hysteresis
AI_RANGE#=1
AI_RANGE#=0
Settings for limit value supervision
Out of range
High-high limit
High limit
Low limit
Low-low limit
Out of range
1MAC059074-MB A
t
Value Reported
Value maximum
Val high high limit
Val high limit
Val low limit
Val low low limit
Value minimum
615 series ANSI
Technical Manual