Overflow Monitoring
(Original Document)
About us
Introduction
The TSX AEY 414 module allows the user to select between several voltage ranges, thermocouple ranges and thermowell ranges for each input.
Whichever range is selected, the module always checks for overflow: it ensures that the measurement falls between a lower and an upper threshold.
Measurement Areas
The measurement range is divided into 3 areas: 
Nominal Area
Measurement range matching the chosen range. 
Overflow Area
Area located beyond the upper threshold. 
Underflow Area
Area located below the lower threshold.
Overflow Flags
In over/underflow areas, there is a risk of saturating the measurement device. In order to counter this risk through the user program, error bits have been prepared:
Bit Name
Flag (when = 1)
%Ir.m.c.ERR
Channel Fault.
%MWr.m.c.2.1
Denotes a range overflow on the channel.
Overflow Values for Voltage Ranges
For voltage ranges, the module allows a 5% overflow of the positive electric range covered. The following table lists the overflow values:
Range
Lower threshold
Upper threshold
Default Values
Min. threshold in User mode
Max. threshold in User mode
+/-10 V
-10.5 V
+10.5 V
+/- 10500
Min -5%(Max-Min)/2
Min +5%(Max-Min)/2
0..0.10 V
-0.5 V
+10.5 V
-500..+ 10500
Min -5%(Max-Min)
Min +5%(Max-Min)
+/-5 V
-5.25 V
+5.25 V
+/- 10500
0...5 V
-0.25 V
+5.25 V
-500..+ 10500
1...5 V
+0.8 V
+5.2 V
0...20 mA
-1 mA
+21 mA
4...20 mA
+3.2 mA
+20.8 mA
Overflow Values for Thermal Ranges
The range under/overflow corresponds either to a dynamic under/overflow of the acquisition device, or to an under/overflow of the sensor's measurement normalized area, or again to a dynamic under/overflow of the cold junction compensation temperature (‐5°C at +85°C). Using internal compensation at a normative ambient temperature (0°C at +60°C) is compatible with thresholds ‐5°C at +85°C. The following table lists these values:
Range
Lower threshold
Upper threshold
Default Values
Min. threshold in User mode
Max. threshold in User mode
Thermocouple B
0 °C (32 °F)
+1802 °C (+3276 °F)
°C or °F
0
+10000
Thermocouple E
-270 °C (-454 °F)
+812 °C (+1493 °F)
Thermo J
-210 °C (-346 °F)
+1065 °C (+1949 °F)
Thermo K
-270 °C (-454 °F)
+1372 °C (+2502 °F)
Thermo L
-200 °C (-328 °F)
+900 °C (+1652 °F)
Thermo N
-270 °C (-454 °F)
+1300 °C (+2372 °F)
Thermo R
-50 °C (-58 °F)
+1769 °C (+3216 °F)
Thermo S
+1769 °C (+3216 °F)
Thermo T
-270 °C (-454 °F)
+400 °C (+752 °F)
Thermo U
-200 °C (-328 °F)
+600 °C (+1112 °F)
Pt100
+850 °C (+1562 °F)
Pt1000
+800 °C (+1472 °F)
Ni1000
-60 °C (-76 °F)
+250 °C (+482 °F)
-13...+63 mV
-13 mV
+63 mV
-2064..+ 10000
Min
Max
0..400 Ω
0
400 Ω
0..+10000
0..3850 Ω
3850 Ω