Advantech Adam 4000 Series - Page 356

B-4 ADAM 4000 Series User's Manual
Data Formats and I/O Ranges
Example 1
The input value is +2.0 V. The input module is configured for a range of ±5 V.
The response to the Analog Data In command is as follows:
+040.00 (cr)
The full calibrated voltage range ranges from -100% to 100% as voltage
input ranges are always bipolar. A ±5 V input would range from -5 V
(-100%) to 5 V (100%).
In this example the input is represented by +40% of the full-scale range
which equals (+(40/100) x 5 V = +2.0 V) the actual input value.
Example 2
The input value is 652.5
o
C. A type K thermocouple (0
o
C to 1000
o
C) is
configured in the analog input module. The response to the Analog Data In
command is:
+065.25 (cr)
The result shows that the value of the input (652.5
o
C) is 65.25% of the value
of the calibrated full-scale range (1000
o
C).
Thermocouple input ranges are always assumed to be bipolar with zero
being the point of symmetry. This holds true regardless of the specified
range of operation. For example, when using a type J thermocouple (0
o
C to
760
o
C) 760
o
C corresponds to +100% and 0
o
C corresponds to 0%. Even if 0
o
C lies outside the specified range of operation for the thermocouple, zero
will remain the point of symmetry. For instance, a type B thermocouple is
specified for operation from +500
o
C to +1800
o
C. In this case +1800
o
C
corresponds to + 100% and 500
o
C corresponds to +27.77%.
The percentage is related to the full span of the configured range. If for
instance a nickel RTD is specified for -80
o
C to +100
o
C then the lower value
of -80
o
C equals 0% of span and the upper value of +100
o
C equals 100% of
span.