The type of under/overflow monitoring implemented for module TSX ASY 410 is determined by its software version. (The software version number is indicated on the label bearing the module reference, on the side of the housing. It is also accessible via Control Expert in Online mode.)
If the Module Software Version is 1.0 (SV<=1.0)
If the values provided to the application are below -10000 or above +10000, outputs will be saturated at the following value:
-
-10 V or +10 V in the +/-10 V range,
-
4 mA or 20 mA in the 4 to 20 mA range,
-
0 mA or 20 mA in the 0 to 20 mA range.
An overflow error is indicated by the following bits (usable in program):
|
Bit Name
|
Meaning (when = 1)
|
|
%Ir.m.c.ERR
|
Denotes an error on the channel.
|
|
%IWr.m.c.2.1
|
Denotes a range overflow on the channel.
|
If the Module Software Version is 2.0 (SV>=2.0)
These modules allow the following overflow:
-
+/-5 % on voltage ranges, and 4 to 20 mA,
-
+5 % on the 0 to 20 mA range.
The measurement range is divided in three 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.
Under/Overflow Values Depending on the Range:
|
Range
|
Lower threshold
|
Upper threshold
|
|
+/-10V
|
-10500 (equals -10.5V)
|
+10500 (equals +10.5V)
|
|
0 to 20 mA
|
0 (i.e. 0 mA)
|
+10500 (equals +21 mA)
|
|
4 to 20 mA
|
-500 (equals 3.2 mA)
|
+10500 (equals +20.8 mA)
|
Range under/overflow detection is optional. You may also
choose the flag for an overflow of the range upper value, for an underflow of the range lower value , or for both.
When the value transmitted falls beyond the overflow thresholds (and if overflow control is required), overflows are indicated by the following bits:
|
Address
|
Meaning (when = 1)
|
|
%Ir.m.c.ERR
|
Denotes an error on the channel.
|
|
%MWr.m.c.2.1
|
Denotes a range overflow on the channel:
-
%MWr.m.c.2.3 = 1 denotes an overflow of the range upper threshold,
-
%MWr.m.c.2.3 = 0 denotes an underflow of the range lower threshold.
|
