DL205 Analog Manual, 7th Edition Rev. D
2-17
Chapter 2: F2-04AD-1, F2-04AD-1L, 4-Channel Analog Current Input
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Analog Power Failure Detection
The Analog module has an on-board processor that can diagnose analog input circuit
problems. A ladder rung can be edited to detect these problems. This rung shows an input
point that would be assigned if the module was installed as shown in the previous examples.
A different point would be used if the module was installed in a different I/O arrangement.
Scaling the Input Data
Most applications usually require
measurements in engineering units which
provides more meaningful data. This is
accomplished by using the conversion formula
shown.
Adjustments may be needed to the formula
depending on the scale being used for the
engineering units.
For example, if pressure (PSI) is to be
measured from 0.0 – 99.9 then multiply the value by 10 in order to imply a decimal place
when viewing the value with the programming software or with a handheld programmer.
Notice how the calculations differ when the multiplier is used.
V2000 K0
=
X37
OUT
C1
V-memory locationV2000 holds
channel 1 data. Whenadatavalue
of zero is returned and inputX37 is
on, then theanalog circuitryisnot
operatingproperly.
V2000 K8000
=
OUT
C1
Pointer method
V-memory locationV2000 holds
channel1data.When a datavalue
of 8000 is returned,then the analog
circuitry is not operatingproperly.
Units = A
H – L
4095
U = Engineering Units
A = Analog Value (0 – 4095)
H = High limit of the engineering
unit range
L = Low limit of the engineering
unit range
Units = A
H – L
4095
Units = 2024
100 – 0
4095
Units = 49
Units = 10A
H – L
4095
Units = 20240
100 – 0
4095
Units = 494
Analog Value of 2024, slightly less than half scale, should yield 49.4 PSI.
Example without multiplier Example with multiplier
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