3.13.2.6 Calibration
RTD and mA inputs are calibrated at the factory. The calibration circuitry monitors
the RTD channels continuously and reports a circuitry break of any channel.
3.13.2.7 Limit value supervision
The limit value supervision function indicates whether the measured value of
AI_INST# exceeds or falls below the set limits. All the measuring channels have
an individual limit value supervision function. The measured value contains the
corresponding range information AI_RANGE# and has a value in the range of 0 to 4:
• 0: “normal”
• 1: “high”
• 2: “low”
• 3: “high-high”
• 4: “low-low”
The range information changes and the new values are reported.
AI_RANGE#=1
AI_RANGE#=3
AI_RANGE#=0
Hysteresis
Val high high limit
Val high limit
Val low limit
Val low low limit
AI_RANGE#=2
AI_RANGE#=4
Y
t
AI_RANGE#=0
Value Reported
Value maximum
Value minimum
Out of Range
Figure 33: Limit value supervision for RTD (X130)
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 56: Settings for X130 (RTD) analog input limit value supervision
Function Settings for limit value supervision
X130 (RTD) analog input Out of range Value maximum
High-high limit Val high high limit
High limit Val high limit
Table continues on the next page
Basic functions 1MRS758755 C
102 REC615 & RER615
Technical Manual
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