DL205 Analog Manual, 7th Edition Rev. D
14-20
Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
D
C
b
A
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Write Data to One Channel
If only one channel is being used, or if the updates are to be controlled separately, the following
logic can be used.
Write the same Data to Both Channels
If both channel select outputs are Off, then both channels will be updated with the same data.
Analog and Digital Value Conversions
It is sometimes useful to do quick conversions between the signal levels and the digital values.
This can be helpful during startup and/or troubleshooting. The following table shows some
formulas to help with the conversions.
For example, if a 10mA signal level is needed, use the
formula to the right to determine the digital value “D” to
be stored in the V-memory location which is designated to
store the data.
Range
If the digital value is known
If the analog signal level is known.
4 – 20 mA
A = 16D + 4
4095
D = 4095 (A – 4)
16
BIN
SP1
LD
V2000
OUT
V40501
The LD instruction loads the data into the
accumulator. Since SP1 is used, this rung
automatically executes on every scan. You could
also use an X, C, etc. permissive contact.
The BIN instruction converts the accumulator data
to binary (you must omit this step if you have
already converted the data elsewhere).
ANDD
K0FFF
The ANDD instruction masks off the channel select
bits to prevent an accidental channel selection.
The OUT instruction sends the data to the
module. Our example starts with V40501, but the
actual value depends on the location of the
module in your application.
RST
Y34
OUT
Y35
Y35--ON deselects channel 2 (do not update).
Y34--OFF selects channel 1 for updating.
BIN
SP1
LD
V2000
OUT
V40501
The LD instruction loads the data into the
accumulator. Since SP1 is used, this rung
automatically executes on every scan. You could
also use an X, C, etc. permissive contact.
The BIN instruction converts the accumulator data
to binary (you must omit this step if you have
already converted the data elsewhere).
ANDD
K0FFF
The ANDD instruction masks off the channel select
bits to prevent an accidental channel selection.
The OUT instruction sends the data to the
module. Our example starts with V40501, but the
actual value depends on the location of the
module in your application.
RST
Y34
Y34--OFF selects channel 1 for updating.
Y35--OFF selects channel 2 for updating.
RST
Y35
D = 4095 (A – 4)
16
D = 4095 (10mA – 4)
16
D = (255.93) (6)
D = 1536
Summary of Contents for DL205
Page 1: ...DL205 Analog I O Manual Manual Number D2 ANLG M ...
Page 2: ...Notes ...
Page 6: ...Notes ...
