AutomationDirect DL205 Manual

DL205 Analog Manual, 7th Edition Rev. D
4-17
Chapter 4: F2-08AD-1, 8-Channel Analog Current Input
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A
B
C
D
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D
The Conversion Program
The following example shows how to write the program to perform the engineering unit
conversion. This example assumes that the data is in BCD and loaded into the appropriate
V-memory locations using instructions that apply to the CPU being used in the PLC.
NOTE: This example uses SP1, which is always on, but any permissive contact such as, X, C, etc., can be used.
Analog and Digital Value Conversions
Sometimes it is useful to be able to quickly convert between the signal levels and the digital
values. This is especially helpful during machine startup or troubleshooting. The following
table provides formulas to make this conversion more simple.
As an example, if the measured signal is 10 mA,
the formula can be used to easily determine the
digital value that will be stored in the V-memory
location that contains the data.
LD
V2000
SP1
MUL
K1000
DIV
K4095
When SP1 is on, load channel1datatothe accumulator.
Multiply theaccumulator by 1000(to startthe conversion).
Divide theaccumulator by 4095.
OUT
V2010
Storethe result in V2010.
Range If the digital value is known If the analog signal level is known.
4 to 20 mA
A =
16D
+ 4
4095
D =
4095
(A - 4)
16
D =
4095
(A)
10
D =
4095
(6V)
10
D = (409.5) (6)
D = 2457

AutomationDirect DL205 Specifications

General

Brand	AutomationDirect
Model	DL205
Category	Controller
Language	English