DL205 Analog Manual, 7th Edition Rev. D
4-16
Chapter 4: F2-08AD-1, 8-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 to the formula may be
needed depending on the scale being
used for the engineering units.
For example, if pressure (PSI) is to be
measured from 0.0 to 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
=
V-memory locationV2000 holds
channel1data.When a datavalue
of zero is returned and inputX37 is
on,thenthe analog circuitry is not
operating properly.
X37
OUT
C1
V2000 K8000
=
V-memory locationV2000 holds
channel1data.When a datavalue
of 8000 is returned,then the analog
circuitry is not operatingproperly.
OUT
C1
Pointers method
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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