Chapter 3 - AutomationDirect
F2-04AD-2,
F2-04AD-2L 4-Channel
Analog Voltage Input
In This Chapter. . . .
— Module Specifications
— Setting the Module Jumpers
— Connecting the Field Wiring
— Module Operation
— Writing the Control Program
3
3--2
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Module Specifications
F2-04AD-2, (L)
4-Ch. Voltage Input
F2--04AD--2
The F2-04AD-2 analog Input module
provides several hardware features.
S Analog inputs are optically
isolated from the PLC logic.
S The module has a removable
terminal block so the module can
be easily removed or changed
without disconnecting the wiring.
S With a DL240/250--1/260 CPU,
you can read all four channels in
one scan.
S On-board active analog filtering
and microcontroller provide digital
signal processing to maintain
precision analog measurements in
noisy environments.
F2--04AD--2L (Obsolete)
NOTE: In 2009 the F2--04AD--2L
was discontinued. A re--designed
F2--04AD--2 was released at the
same time which can be powered
by either 12 VDC or 24VDC input
power supplies. This new module
is a direct replacement for prior
F2--04AD--2 and all F2--04AD--2L
modules. The new module is a
single circuit board design and the
jumper link locations are different.
See Setting the Module Jumpers
on page 3--5. Also, some
specifications were changed on
page 3--3. Otherwise, the
re--designed module functions the
same as the prior designs.
--
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2
IN
ANALOG
4CH
F2--04AD--2
10--30VDC
5mA
0V
+24V
CH1-CH1+
CH2-CH2+
CH3-CH3+
CH4-CH4+
ANALOG IN
0--5, 0--10VDC
+/--5,+/--10VDC
F2-04AD-2L
IN
F2--04AD--2
18--26.4VDC
90mA
0V
+12V
CH1-CH1+
CH2-CH2+
CH3-CH3+
CH4-CH4+
ANALOG IN
0--5, 0--10VDC
+/--5,+/--10VDC
ANALOG
4CH
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Input
Specifications
3--3
All specifications are the same for both modules except for the input voltage
requirements. Review these specifications to make sure the module meets your
application requirements.
Number of Channels
4, single ended (one common)
Input Ranges
0 to 5V, 0 to 10V, 5V, 10V
Resolution
12 bit (1 in 4096) unipolar (0 -- 4095)
13 bit (1 in 8192) bipolar (--4095 -- +4095)
--50 dB at 800 Hz
Step Response
8.2 ms (*10 ms) to 95% of full step change
Crosstalk
--70 dB, 1 count maximum
Active Low-pass Filtering
--3 dB at 80Hz, 2 poles (--12 dB per octave)
Input Impedance
> 20 MΩ
Absolute Maximum Ratings
--75 to +75 VDC
Converter type
Successive approximation
Linearity Error (End to End)
1 count (0.025% of span) maximum unipolar
2 counts maximum bipolar
Input Stability
1 count
Full Scale Calibration Error
(Offset error not included)
Offset Calibration Error
3 counts maximum
Maximum Inaccuracy
.1% @ 25C
25 C (77
(77F)
F)
.3% 0 to 60_C (32 to 140F)
1 count maximum (0V input)
Accuracy vs
vs. Temperature
General
Specifications
50 ppm / _C full scale calibration change (including
maximum offset change of 2 counts)
One count in the specification table is equal to one least significant bit of the analog data value (1 in 4096).
1 channel per scan maximum (D2--230 CPU)
PLC Update Rate
4 channels per scan max. (D2--240/250--1/260CPU)
Digital Inputs
Input points required
12 binary data bits, 2 channel ID bits, 1 sign/diagnostics
bit 1 diagnostic bit
bit,
16 point (X) input module
Power Budget Requirement
External Power Supply
110 mA (*60 mA) maximum,
maximum 5 VDC (supplied by base)
5 mA (*90 mA) max., 10--30 VDC (*18--26.4 VDC)
(F2-04AD-2 models);
90 mA maximum, 10 to 15 VDC (F2-04AD-2L models)
Operating Temperature
Storage Temperature
0 to 60_ C (32 to 140 F )
--20 to 70_ C (--4 to 158 F)
Relative Humidity
5 to 95% (non-condensing)
Environmental air
No corrosive gases permitted
Vibration
MIL STD 810C 514.2
Shock
MIL STD 810C 516.2
Noise Immunity
NEMA ICS3--304
ICS3 304
* Values in parenthesis with an asterisk are for older modules with two circuit board design and date codes 0609F4
and previous. Values not in parenthesis are for single circuit board models with date code 0709G and above.
Analog Input
Configuration
Requirements
Appears as a 16-point discrete input module and can be installed in any slot of a DL205
system. The available power budget and discrete I/O points are the limiting factors. Check
the user manual for your particular model of CPU and I/O base for more information
regarding power budget and number of local, local expansion or remote I/O points.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Common Mode Rejection
3--4
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Special Placement
Requirements
(DL230 and
Remote I/O Bases)
Even though the module can be placed in any slot, it is important to examine the
configuration if you are using a DL230 CPU. As you can see in the section on writing
the program, you use V-memory locations to extract the analog data. If you place
the module so that the input points do not start on a V-memory boundary, the
instructions cannot access the data. This also applies when placing this module in a
remote base using a D2--RSSS in the CPU slot.
F2--04AD-2
Correct!
Slot 0
Slot 1
8pt
Input
8pt
Input
Slot 2
16pt
Input
16pt
Input
X0
-X7
X10
-X17
X20
-X37
X40
-X57
V40400
Slot 3
Slot 4
16pt
Output
Y0
-Y17
V40402 V40500
F2-04AD-2, (L)
4-Ch. Voltage Input
V40401
Data is correctly entered so input points
start on a V-memory boundary.
MSB
LSB
X
3
7
Incorrect
X
2
0
F2--04AD-2
Slot 0
Slot 1
Slot 2
Slot 3
8pt
Input
16pt
Input
16pt
Input
16pt
Input
Slot 4
16pt
Output
X0
-X7
X10
-X27
X30
-X47
X50
-X67
Y0
-Y17
Data is split over two locations, so instructions cannot access data from a DL230.
V40401
MSB
LSB
X X
3 2
0 7
X
3
7
X
2
0
V40400
MSB
LSB
X X
1 7
0
X
1
7
X
0
To use the V-memory references required for a DL230 CPU, the first input address
assigned to the module must be one of the following X locations. The table also
shows the V-memory addresses that correspond to these X locations.
X
X0
X20
V
V40400 V40401 V40402 V40403 V40404 V40405 V40406 V40407
DL205 Analog Manual 7th Ed. Rev. B 4/10
X40
X60
X100
X120
X140
X160
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
3--5
Setting the Module Jumpers
Selecting the
Number of
Channels
There are two jumpers, labeled +1 and
+2, that are used to select the number of
channels that will be used. See the
figures below to find the jumpers on your
module. The module is set from the
factory for four channel operation.
Any unused channels are not
processed, so if you only select
channels 1 thru 3, channel 4 will not be
active. The following table shows how to
use the jumpers to select the number of
channels.
Channel
+1
+2
1
No
No
1, 2
Yes
No
1, 2, 3
No
Yes
1, 2, 3, 4
Yes
Yes
For example, to select all 4
channels (1--4), leave both jumpers
installed. To select channel 1,
remove both jumpers.
Jumper Location on Modules Having
Date Code 0609F4 and Previous
(Two Circuit Board Design)
+1
+2
Jumper Location on Modules Having
Date Code 0709G and Above
(Single Circuit Board Design)
Use jumpers
+1 and +2 to
select number
of channels.
+1 +2
Jumper +1
These jumpers are located on the
motherboard, the one with the black
D-shell style backplane connector.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Yes = jumper installed
No = jumper removed
3--6
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Selecting the
Input Signal
Range
There is another jumper, labeled either
J2 or J3 (depending on the whether you
have a single or double circuit board
module), that is used to select between
the 5V ranges and the 10V ranges. See
the figures below to locate the jumper on
your module. The module comes from
the factory set for 10V operation (jumper
not installed).
Jumper J2 Location on Modules Having
Date Code 0609F4 and Previous
(Two Circuit Board Design)
Install jumper J2 or J3 for
0--5V or 5V operation.
Remove J2 or J3, or store on
a single pin, for 0 to10 or
10V operation.
Jumper J3 Location on Modules Having
Date Code 0709G and Above
(Single Circuit Board Design)
J3
F2-04AD-2, (L)
4-Ch. Voltage Input
Jumper J2
Jumper J2 is located on the smaller
circuit board, which is on top of the
motherboard.
Install J2 for 0--5V or 5V operation.
Remove J2, or store on a single pin,
for 0 to10 or 10V operation.
DL205 Analog Manual 7th Ed. Rev. B 4/10
Install J3 for 0--5V or 5V operation.
Remove J3, or store on a single pin,
for 0 to10 or 10V operation.
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
3--7
Connecting the Field Wiring
Wiring
Guidelines
User Power
Supply
Requirements
Your company may have guidelines for wiring and cable installation. If so, you
should check those before you begin the installation. Here are some general things
to consider:
S Use the shortest wiring route whenever possible.
S Use shielded wiring and ground the shield at the transmitter source. Do
not ground the shield at both the module and the source.
S Do not run the signal wiring next to large motors, high current switches,
or transformers. This may cause noise problems.
S Route the wiring through an approved cable housing to minimize the
risk of accidental damage. Check local and national codes to choose
the correct method for your application.
WARNING: If you are using the 24 VDC base power supply, make sure you
calculate the power budget. Exceeding the power budget can cause unpredictable
system operation that can lead to a risk of personal injury or damage to equipment.
The DL205 base has a switching type power supply. As a result of switching noise,
you may notice 3--5 counts of instability in the analog input data if you use the
base power supply. If this is unacceptable, you should try one of the following:
1. Use a separate linear power supply.
2. Connect the 24VDC common to the frame ground, which is the screw
terminal marked “G” on the base.
By using these methods, the input stability is rated at 1 count.
The F2-04AD-2L requires 10--15VDC at 90mA and must be powered by a separate
power supply.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
The module requires at least one field-side power supply. You may use the same or
separate power sources for the module supply and the voltage transmitter supply.
The F2-04AD-2 module requires 18--26.4VDC at 80 mA. The DL205 bases have
built-in 24 VDC power supplies that provide up to 300mA of current. You may use
this instead of a separate supply if you are using only a couple of analog modules.
It is desirable in some situations to power the transmitters separately in a location
remote from the PLC. This will work as long as the transmitter supply meets the
voltage and current requirements, and the transmitter minus (--) side and the
module supply’s minus (--) side are connected together.
3--8
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Custom Input
Ranges
Occasionally you may have the need to connect a (current) transmitter with an
unusual signal range. By changing the wiring slightly and adding an external
resistor to convert the current to voltage, you can easily adapt this module to meet
the specifications for a transmitter that does not adhere to one of the standard input
ranges. The following diagram shows how this works. The example below only
shows channel 1, but you can also use the other channels as well.
Module internal circuitry
0V
24V
24 V
IN+
0V
CH1
IN--
CH2
R
-CH3
Analog Switch
Current
Transmitter
+5V
+15V
--15V
+
50mA
DC to DC
Converter
Field wiring
0V
A to D
Converter
F2-04AD-2, (L)
4-Ch. Voltage Input
CH4
R=
OV
Vmax
Imax
R = value of external resistor
Vmax = high limit of selected voltage range (5V or 10V)
Imax = maximum current supplied by the transmitter
Example: current transmitter capable of 50mA, 0 -- 10V range selected.
R=
10V
R = 200 ohms
50mA
NOTE:Your choice of resistor can affect the accuracy of the module. A resistor that
has 0.1% tolerance and a 50ppm / _C temperature coefficient is
recommended.
If you use 4--20mA signals and convert them to voltage using this method, you can
easily check for broken transmitter conditions. For example, if you are using the
0--5V range and the lowest signal for the 4--20mA transmitter is 4mA, the lowest
digital value for the signal is not 0, but instead is 819.
If the transmitter is working properly, the smallest value would be 819 in the DL205.
If you see a value of less than about 750 (allowing for tolerance), then you know the
transmitter is broken.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
3--9
The module has a removable connector to make wiring easier. Simply squeeze the
top and bottom retaining clips and gently pull the connector from the module. Use
the following diagram to connect the field wiring. The diagram shows separate
module and transmitter power supplies. If you desire to use only one field-side
supply, just combine the supplies’ positive (+) terminals into one node and remove
the transmitter supply.
Wiring Diagram
Notes: 1. Shields should be grounded at the signal source.
2. Unused inputs should be jumpered together (i.e. Ch4-- to Ch4+).
3. More than one external power supply can be used provided the
commons are connected together.
4. F2-04AD-2L requires 10--15 VDC input supply.
Module Supply
See NOTES 3, 4
18-26.4VDC
+
Typical User Wiring
--
See NOTE 1
Internal
Module
Wiring
0 VDC
24 V
CH1--
0V
10--30VDC
5mA
CH2
CH3-CH3+
CH3
Voltage
+
Transmitter
CH3
CH4-CH4+
CH4
--
CH4
Voltage
+
Transmitter
Analog Switch
CH2+
--
F2--04AD--2
CH1
CH2--
+
-CH2
Voltage
+
Transmitter
+
+5V
+15V
--15V
CH1+
ANALOG
4CH
A to D
Converter
0V
+24V
CH1-CH1+
CH2-CH2+
CH3-CH3+
CH4-CH4+
ANALOG IN
0--5, 0--10VDC
+/--5,+/--10VDC
+
See NOTE 3
-5-12VDC
Supply
Transmitter Supply
OV
24 volts model shown, but wiring is
the same for 12 volts model.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
+
-CH1
Voltage
+
Transmitter
DC to DC
Converter
--
+
0V
+24 VDC
IN
3--10
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Module Operation
Channel
Scanning
Sequence for a
DL230 CPU
(Multiplexing)
Before you begin writing the control program, it is important to take a few minutes to
understand how the module processes and represents the analog signals.
The module can supply different amounts of data per scan, depending on the type
of CPU you are using. The DL230 can obtain one channel of data per CPU scan.
Since there are four channels, it can take up to four scans to get data for all
channels. Once all channels have been scanned the process starts over with
channel 1. Unused channels are not processed, so if you select only two channels,
then each channel will be updated every other scan. The multiplexing method can
also be used for the DL240/250--1/DL260 CPUs.
Scan
System With
DL230 CPU
F2-04AD-2, (L)
4-Ch. Voltage Input
Read Inputs
Execute Application Program
Read the data
Store data
Write to Outputs
DL205 Analog Manual 7th Ed. Rev. B 4/10
Scan N
Channel 1
Scan N+1
Channel 2
Scan N+2
Channel 3
Scan N+3
Channel 4
Scan N+4
Channel 1
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Channel Scanning
Sequence with a
DL240, DL250--1
or DL260 CPU
(Pointer Method)
3--11
If you are using a DL240, DL250--1 or DL260 CPU, you can obtain all four channels
of input data in one scan. This is because the DL240/250--1/260 CPU supports
special V-memory locations that are used to manage the data transfer (this is
discussed in more detail in the section on Writing the Control Program).
Scan
System With
DL240/250--1/
260CPU
Read Inputs
Execute Application Program
Read the data
Store data
Ch 1, 2, 3, 4
Scan N+1
Ch 1, 2, 3, 4
Scan N+2
Ch 1, 2, 3, 4
Scan N+3
Ch 1, 2, 3, 4
Scan N+4
Ch 1, 2, 3, 4
Write to Outputs
Analog Module
Updates
Even though the channel updates to the CPU are synchronous with the CPU scan,
the module asynchronously monitors the analog transmitter signal and converts
the signal to a 12-bit binary representation. This enables the module to
continuously provide accurate measurements without slowing down the discrete
control logic in the RLL program.
For the vast majority of applications, the values are updated much faster than the
signal changes. However, in some applications, the update time can be important.
The module takes approximately 10 milliseconds to sense 95% of the change in the
analog signal.
Note, this is not the amount of time required to convert the signal to a digital
representation. The conversion to the digital representation takes only a few
microseconds. Many manufacturers list the conversion time, but it is the settling
time of the filter that really determines the update time.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Scan N
3--12
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Understanding
the Input
Assignments
You may recall that the module appears to the CPU as a 16-point discrete input
module. You can use these points to obtain:
S an indication of which channel is active.
S the digital representation of the analog signal.
S module diagnostic information.
Since all input points are automatically mapped into V memory, it is very
easy to determine the location of the data word that will be assigned to the module.
F2--04AD-2
Slot 0
Slot 1
Slot 2
Slot 3
8pt
Input
8pt
Input
16pt
Input
16pt
Input
X0
-X7
X10
-X17
X20
-X37
X40
-X57
V40400
Slot 4
16pt
Output
Y0
-Y17
V40402
F2-04AD-2, (L)
4-Ch. Voltage Input
V40401
MSB
LSB
XXXX
3 3 3 3
7 6 5 4
Data Bits
X
2
0
Within these word locations, the individual bits represent specific information
about the analog signal.
Analog Data
Bits
Active Channel
Indicator Inputs
The first twelve bits represent the
analog data in binary format.
Bit
Value
Bit
Value
0
1
6
64
1
2
7
128
2
4
8
256
3
8
9
512
4
16
10
1024
5
32
11
2048
Two of the inputs are binary encoded to
indicate the active channel (remember,
the V-memory bits are mapped directly
to discrete inputs). The inputs
automatically turn on and off to indicate
the current channel for each scan.
Scan
X35 X34
Channel
N
Off
Off
1
N+1
Off
On
2
N+2
On
Off
3
N+3
On
On
4
N+4
Off
Off
1
DL205 Analog Manual 7th Ed. Rev. B 4/10
V40401
MSB
LSB
11 9 8 7 6 5 4 3 2 1 0
10
= data bits
V40401
MSB
X X
3 3
5 4
= channel inputs
LSB
X
2
0
3--13
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Module Diagnostic
and Sign Inputs
The last two inputs are used for module
diagnostics.
Module Busy — The first diagnostic
input (X36 in this example) indicates a
“busy” condition. This input will always
be active on the first PLC scan, to tell the
CPU that the analog data is not valid.
After the first scan, the input usually only
comes on when extreme environmental
(electrical) noise problems are present.
V40401
MSB
LSB
XX
3 3
7 6
X
2
0
= Module Busy
= diagnostics and sign
The last input (X37 in this example) is used for two purposes.
Module
Resolution
Since the module has 12-bit unipolar
resolution, the analog signal is
converted into 4096 counts ranging from
0 -- 4095 (212). For example, with a 0 to
10V scale, a 0V signal would be 0 and a
10V signal would be 4095. This is
equivalent to a binary value of 0000
0000 0000 to 1111 1111 1111, or 000 to
FFF hexadecimal. The diagram shows
how this relates to each signal range.
The bipolar ranges utilize a sign bit to
provide 13-bit resolution. A value of
4095 can represent the upper limit of
either side of the range. Use the sign bit
to determine negative values.
Unipolar
Ranges
Bipolar
Ranges
+V
+V
0V
0V
0
4095
--V
--4095
0
4095
Unipolar Resolution = H – L
4095
H
Bipolar Resolution = – L
8191
H or L = high or low limit of the range
Each count can also be expressed in terms of the signal level by using the equation
shown. The following table shows the smallest detectable signal change that will
result in one LSB change in the data value for each input signal range.
Range
Signal Span
(H -- L)
Divide By
Smallest Detectable
Change
0 to +10V
10V
4095
2.44 mV
--10 to +10V
20V
8191
2.44 mV
0 to +5V
5V
4095
1.22 mV
--5V to +5V
10V
8191
1.22 mV
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Signal Sign — When using bipolar ranges you need to know if the value returned is
positive or negative. When this input is off, the value stored represents a positive
analog signal (0V or greater). If the input is on, then the value stored represents a
negative input signal (less than 0V).
Channel Failure — This input can also indicate an analog channel failure. For
example, if the 24 VDC input power is missing or the terminal block is loose, the
module turns on this input and returns a data value of zero (remember, if this input is
on and the data value is not equal to zero, then it is just showing the sign).
The next section, Writing the Control Program, shows how you can use these inputs
in your control program.
3--14
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Writing the Control Program
Reading Values:
Pointer Method
and Multiplexing
Pointer Method

F2-04AD-2, (L)
4-Ch. Voltage Input
230
 

240 250-- 1 260
There are two methods of reading values:
S The pointer method
S Multiplexing
You must use the multiplexing method when using a DL230 CPU. You must also
use the multiplexing method with remote I/O modules (the pointer method will not
work). You can use either method when using DL240, DL250--1 and DL260 CPUs,
but for ease of programming it is strongly recommended that you use the pointer
method.
DL240, DL250--1 and DL260 CPUs have special V-memory locations assigned to
each base slot that greatly simplify the programming requirements. These
V-memory locations:
S specify the data format
S specify the number of channels to scan
S specify the storage locations
NOTE: DL250 CPUs with firmware release version 1.06 or later support this
method. If you must use the DL230 example, module placement in the base is very
important. Review the section earlier in this chapter for guidelines.
The example program shows how to setup these locations. Place this rung
anywhere in the ladder program or in the Initial Stage if you are using RLL PLUS
instructions. This is all that is required to read the data into V-memory locations.
Once the data is in V-memory, you can perform math on the data, compare the data
against preset values, and so forth. V2000 is used in the example but you can use
any user V-memory location. In this example the module is installed in slot 2. You
should use the V-memory locations for your module placement. The pointer method
automatically converts values to BCD.
SP0
LD
K 04 00
- or -
LD
K 84 00
Loads a constant that specifies the number of channels to scan and
the data format. The upper byte, most significant nibble (MSN)
selects the data format (i.e. 0=BCD, 8=Binary), the LSN selects the
number of channels (i.e. 1, 2, 3, or 4).
The binary format is used for displaying data on some operator
interfaces. The DL230/240 CPUs do not support binary math
functions, whereas the DL250 does.
OUT
V7662
Special V-memory location assigned to slot 2 that contains the
number of channels to scan.
LDA
O2000
This loads an octal value for the first V-memory location that will be
used to store the incoming data. For example, the O2000 entered
here would designate the following addresses.
Ch1 -- V2000, Ch2 -- V2001, Ch3 -- V2002, Ch 4 -- V2003
OUT
V7672
The octal address (O2000) is stored here. V7672 is assigned to slot
2 and acts as a pointer, which means the CPU will use the octal
value in this location to determine exactly where to store the
incoming data.
DL205 Analog Manual 7th Ed. Rev. B 4/10
3--15
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
The tables below show the special V-memory locations used by the DL240,
DL250--1 and DL260 for the CPU base and local expansion base I/O slots. Slot 0
(zero) is the module next to the CPU or D2--CM module. Slot 1 is the module two
places from the CPU or D2--CM, and so on. Remember, the CPU only examines the
pointer values at these locations after a mode transition. Also, if you use the DL230
(multiplexing) method, verify that these addresses in the CPU are zero.
The Table below applies to the DL240, DL250--1 and DL260 CPU base.
CPU Base: Analog Input Module Slot-Dependent V-memory Locations
Slot
0
1
2
3
4
5
6
7
No. of Channels
V7660 V7661 V7662 V7663 V7664 V7665 V7666 V7667
Storage Pointer
V7670 V7671 V7672 V7673 V7674 V7675 V7676 V7677
The Table below applies to the DL250--1 or DL260 expansion base 1.
Expansion Base D2--CM #1: Analog Input Module Slot-Dependent V-memory Locations
Slot
0
1
2
3
4
5
6
7
No. of Channels
V36000 V36001 V36002 V36003 V36004 V36005 V36006 V36007
Storage Pointer
V36010 V36011 V36012 V36013 V36014 V36015 V36016 V36017
Expansion Base D2--CM #2: Analog Input Module Slot-Dependent V-memory Locations
Slot
0
1
2
3
4
5
6
7
No. of Channels
V36100 V36101 V36102 V36103 V36104 V36105 V36106 V36107
Storage Pointer
V36110 V36111 V36112 V36113 V36114 V36115 V36116 V36117
The Table below applies to the DL260 CPU expansion base 3.
Expansion Base D2--CM #3: Analog Input Module Slot-Dependent V-memory Locations
Slot
0
1
2
3
4
5
6
7
No. of Channels
V36200 V36201 V36202 V36203 V36204 V36205 V36206 V36207
Storage Pointer
V36210 V36211 V36212 V36213 V36214 V36215 V36216 V36217
The Table below applies to the DL260 CPU expansion base 4.
Expansion Base D2--CM #4: Analog Input Module Slot-Dependent V-memory Locations
Slot
0
1
2
3
4
5
6
7
No. of Channels
V36300 V36301 V36302 V36303 V36304 V36305 V36306 V36307
Storage Pointer
V36310 V36311 V36312 V36313 V36314 V36315 V36316 V36317
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
The Table below applies to the DL250--1 or DL260 expansion base 2.
3--16
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Using Bipolar
Ranges
(Pointer Method)
   
230
240 250-- 1 260
With bipolar ranges, you need some additional logic to determine whether the
value being returned represents a positive voltage or a negative voltage. For
example, you may need to know the direction for a motor. With the DL240/250 CPU,
you cannot use the last input (X37 in the previous examples) to show the sign for
each channel. This is because the DL240/250--1/260 reads all four channels in one
scan. Therefore, if you tried to use X37 you would only be monitoring the last
channel that was read. You would not be able to determine the sign for the previous
three channels. There is a simple solution:
S
If you get a value greater than or equal to 8001, the value is negative.
The sign bit is the most significant bit, which combines 8000 to the data value. If the
value is greater than or equal to 8001, you only have to mask the most significant bit
and the active channel bits to determine the actual data value.
F2-04AD-2, (L)
4-Ch. Voltage Input
The following program shows how you can accomplish this. Since you always want
to know when a value is negative, these rungs should be placed before any other
operations that use the data, such as math instructions, scaling operations, and so
forth. Also, if you are using stage programming instructions, these rungs should be
in a stage that is always active. Please note, you only need this logic for each
channel that is using bipolar input signals. The example only shows two channels.
Check Channel 1
SP1
V2000
Load channel 1 data from V-memory into the
accumulator. Remember, the data can be negative.
Contact SP1 is always on.
ANDD
K7FFF
This instruction masks the sign bit of the BCD data if it
is set. Without this step, negative values will not be
correct, so do not forget to include it.
OUT
V2020
Put the actual signal value in V2020. Now you can use
the data normally.
K8001
Check Channel 2
SP1
V2001
K8001
²
C1
OUT
²
DL205 Analog Manual 7th Ed. Rev. B 4/10
LD
V2000
Channel 1 data is negative when C1 is on (a value of --1
reads as 8001, --2 is 8002, etc.).
LD
V2001
Load channel 2 from V-memory into the accumulator.
Remember, the data can be negative. Contact SP1 is
always on.
ANDD
K7FFF
This instruction masks the sign bit of the BCD data if it
is set. Without this step, negative values will not be
correct, so do not forget to include it.
OUT
V2021
Put the actual signal value in V2021. Now you can use
the data normally.
C2
OUT
Channel 2 data is negative when C2 is on (a value of --1
reads as 8001, --2 is 8002, etc.).
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Reading Values
(Multiplexing)
   
230
240 250-- 1 260
3--17
The DL230 CPU does not have the special V-memory locations that allow you to
automatically enable the data transfer. Since all channels are multiplexed from a
single data word, the control program must be setup to determine which channel is
being read. Since the module appears as 16 X input points to the CPU, it is very
easy to use the active channel status bits to determine which channel is being
monitored.
Note, this example is for a module installed as shown in the previous examples. The
addresses used would be different if the module was used in a different I/O
configuration. You can place these rungs anywhere in the program, or if you are
using stage programming place them in a stage that is always active.
Load data when module is not busy.
X36
LD
V40401
ANDD
KFFF
Store Channel 2
X36
X34
X35
Store Channel 3
X36
X34
X35
Store Channel 4
X36
X34
X35
This instruction masks the channel identification bits.
Without this, the values used will not be correct, so do
not forget to include it.
BCD
It is usually easier to perform math operations in BCD.
So it is best to convert the data to BCD immediately.
You can leave out this instruction if your application
does not require it.
OUT
V2000
When the module is not busy and X34 and X35 are
off, channel 1 data is stored in V2000.
OUT
V2001
When X34 is on and X35 is off, channel 2 data is
stored in V2001.
OUT
V2002
OUT
V2003
When X34 is off and X35 is on, channel 3 data is
stored in V2002.
When both X34 and X35 are on, channel 4 data is
stored in V2003.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Store Channel 1
X36
X34
X35
Loads the complete data word into the accumulator.
The V-memory location depends on the I/O
configuration. See Appendix A for the memory map.
3--18
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Single Channel
Selected
Since you do not have to determine which channel is selected, the single channel
program is even simpler.
Store channel 1 when module is not busy.
X36
X34
X35
LD
V40401
This instruction masks the channel identification bits.
Without this, the values used will not be correct, so do
not forget to include it.
ANDD
KFFF
It is usually easier to perform math operations in BCD,
so it is best to convert the data to BCD immediately.
You can leave out this instruction if your application
does not require it.
BCD
OUT
V2000
F2-04AD-2, (L)
4-Ch. Voltage Input
Using Bipolar
Ranges
(Multiplexing)
Loads the complete data word into the accumulator.
The V-memory location depends on the I/O
configuration. See Appendix A for the memory map.
When the module is not busy and X34 and X35 are off,
channel 1 data is stored in V2000.
With bipolar ranges, you need some additional logic because you need to know if
the value being returned represents a positive voltage or a negative voltage. For
example, you may need to know the direction for a motor. Since the DL230 only
reads one channel per scan, you can use the last input (X37 in the examples) to
show the sign.
The following program shows how you can accomplish this. Since you always want
to know when a value is negative, these rungs should be placed before any
operations that use the data, such as math instructions, scaling operations, and so
forth. Also, if you are using stage programming instructions these rungs should be
in a stage that is always active. Please note, you only need the additional logic for
those channels that are using bipolar input signals. The example shows two
channels but you can repeat these steps for all four channels if necessary.
Load data when module is not busy.
X36
LD
V40401
Loads the complete data word into the
accumulator. The V-memory location depends
on the I/O configuration. See Appendix A for
the memory map.
This instruction masks the channel identification
bits. Without this, the values used will not be
correct, so do not forget to include it.
ANDD
KFFF
X36
X34
It is usually easier to perform math operations in
BCD, so it is best to convert the data to BCD
immediately. You can leave out this instruction if
your application does not require it.
BCD
Store Channel 1
X35
OUT
V2000
C0
When the module is not busy and X34 and X35
are off, channel 1 data is stored in V2000. C0 is
reset to indicate channel one’s value is positive.
RST
X37
Store Channel 2
X36
X34
C0
SET
X35
OUT
V2001
C1
If X37 is on, then the data value represents a
negative voltage. C0 is set to indicate channel 1’s
value is negative.
When the module is not busy, and X34 is on
and X35 is off, channel 2 data is stored in
V2001. C1 is reset to indicate that channel 2’s
value is positive.
RST
X37
C1
SET
DL205 Analog Manual 7th Ed. Rev. B 4/10
If X37 is on, then the data value represents a
negative voltage. C1 is set to indicate that
channel 2’s value is negative.
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Using 2’s
Complement
(Multiplexing)

230
 
3--19
The 2’s complement data format may be required to display negative values on some
operator interface devices. It could also be used to simplify data averaging on bipolar
signals.

240 250-- 1 260
The example shows two channels, but you can repeat these steps for all four channels
if necessary.
Load data when module is not busy.
X36
LD
V40401
Store Channel 1
X36
X34
X35
Loads the complete data word into the accumulator.
The V-memory location depends on the I/O
configuration. See Appendix A for the memory map.
ANDD
KFFF
This instruction masks the channel identification bits.
Without this, the values used will not be correct, so
do not forget to include it.
OUT
V2000
When the module is not busy and X34 and X35 are
off, channel 1 data is stored in V2000. C0 is reset to
indicate that channel 1’s value is positive.
C0
RST
X37
C0
SET
Invert the bit pattern in the accumulator.
BCD
ADDD
K1
X36
X34
X35
Channel 1 data is in double word starting at V2040.
OUTD
V2040
Store Channel 2
X36
X34
X35
When the module is not busy and X34 is on and X35
is off, channel 2 data is stored in V2001. C1 is reset
to indicate channel 2’s value is positive.
OUT
V2001
C1
RST
X37
C1
SET
INV
If X37 is on, then the data value represents a
negative voltage. C1 is set to indicate that channel
2’s value is negative.
Invert the bit pattern in the accumulator.
BCD
ADDD
K1
X36
X34
X35
OUTD
V2042
Channel 2 data is in double word starting at V2042.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
INV
If X37 is on, then the data value represents a
negative voltage. C0 is set to indicate that channel
1’s value is negative.
3--20
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Analog Power
Failure Detection
The analog module has a microcontroller that can diagnose analog input circuit
problems. You can easily create a simple ladder rung to detect these problems.
This rung shows an input point that would be assigned if the module was used as
shown in the previous examples. A different point would be used if the module was
installed in a different I/O configuration.
Multiplexing method
V2000
K0
X37
=
C0
OUT
V-memory location V2000 holds
channel 1 data. When a data value
of zero is returned and input X37 is
on, then the analog circuitry is not
operating properly.
Pointers method
V2000
K8000
C0
F2-04AD-2, (L)
4-Ch. Voltage Input
=
Scaling the
Input Data
OUT
Most applications usually require
measurements in engineering units,
which provide more meaningful data.
This is accomplished by using the
conversion formula shown.
You may have to make adjustments to
the formula depending on the scale you
choose for the engineering units.
V-memory location V2000 holds
channel 1 data. When a data value
of 8000 is returned, then the analog
circuitry is not operating properly.
Units = A H − L
4095
H = high limit of the engineering
unit range
L = low limit of the engineering
unit range
A = Analog value (0 -- 4095)
For example, if you wanted to measure pressure (PSI) from 0.0 to 99.9 then you
would have to multiply the analog value by 10 in order to imply a decimal place when
you view the value with the programming software or a handheld programmer.
Notice how the calculations differ when you use the multiplier.
Analog Value of 2024, slightly less than half scale, should yield 49.4 PSI
Example without multiplier
Example with multiplier
Units = A H − L
4095
Units = 10 A H − L
4095
Units = 2024 100 − 0
4095
Units = 20240 100 − 0
4095
Units = 49
Units = 494
Handheld Display
V 2001
0000
V 2000
0049
Handheld Display
V 2001
0000
V 2000
0494
This value is more accurate.
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
3--21
Here is how you would write the program to perform the engineering unit conversion.
This example assumes you have BCD data loaded into the appropriate V-memory
locations using instructions that apply for the model of CPU you are using.
NOTE: This example uses SP1, which is always on. You could also use an X, C, etc. permissive contact.
SP1
LD
V2000
When SP1 is on, load channel 1 data to the accumulator.
MUL
K1000
Multiply the accumulator by 1000 (to start the conversion).
DIV
K4095
Divide the accumulator by 4095.
OUT
V2010
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. Remember, this module does not operate like other versions of
analog input modules that you may be familiar with. The bipolar ranges use 0--4095
for both positive and negative voltages. The sign bit allows this, which actually
provides better resolution than those modules that do not offer a sign bit. The
following table provides formulas to make this conversion easier.
Range
If you know the digital value ...
If you know the signal level ...
0 to 5V
--5V to +5V
A = 5D
4095
D = 4095 (A)
5
0 to 10V
--10V to +10V
A = − 10D
4095
D = 4095 ABS(A)
10
For example, if you are using the --10 to
+10V range and you have measured the
signal at 6V, use the following formula to
determine the digital value that is stored
in the V-memory location that contains
the data.
D = 4095 (A)
10
D = 4095 (6V)
10
D = (409.5) (6)
D = 2457
DL205 Analog Manual 7th Ed. Rev. B 4/10
F2-04AD-2, (L)
4-Ch. Voltage Input
Analog
and Digital
Value
Conversions
Store the result in V2010.
3--22
F2-04AD-2, F2-04AD-2L 4-Channel Analog Voltage Input
Filtering Input
Noise (DL250--1,
DL260 CPUs Only)
   
230
240 250-- 1 260
Add the following logic to filter and smooth analog input noise in DL250--1/DL260
CPUs. This is especially useful when using PID loops. Noise can be generated by
the field device and/or induced by field wiring.
The analog value in BCD is first converted to a binary number because there is not a
BCD-to-real conversion instruction. Memory location V1400 is the designated
workspace in this example. The MULR instruction is the filter factor, which can be
from 0.1 to 0.9. The example uses 0.2. A smaller filter factor increases filtering. You
can use a higher precision value, but it is not generally needed. The filtered value is
then converted back to binary and then to BCD. The filtered value is stored in
location V1402 for use in your application or PID loop.
NOTE: Be careful not to do a multiple number conversion on a value. For example,
if you are using the pointer method to get the analog value, it is in BCD and must be
converted to binary. However, if you are using the conventional method of reading
analog and are masking the first twelve bits, then it is already in binary and no
conversion using the BIN instruction is needed.
F2-04AD-2, (L)
4-Ch. Voltage Input
SP1
LD
V2000
BIN
BTOR
Converts the BCD value in the accumulator to
binary. Remember, this instruction is not
needed if the analog value is originally
brought in as a binary number.
Converts the binary value in the accumulator
to a real number.
SUBR
V1400
Subtracts the real number stored in location
V1400 from the real number in the accumulator,
and stores the result in the accumulator. V1400
is the designated workspace in this example.
MULR
R0.2
Multiplies the real number in the
accumulator by 0.2 (the filter factor),
and stores the result in the
accumulator. This is the filtered value.
ADDR
V1400
Adds the real number stored in
location V1400 to the real number
filtered value in the accumulator, and
stores the result in the accumulator.
OUTD
V1400
RTOB
BCD
OUT
V1402
DL205 Analog Manual 7th Ed. Rev. B 4/10
Loads the analog signal, which is a BCD value
and has been loaded from V-memory location
V2000, into the accumulator. Contact SP1 is
always on.
Copies the value in the accumulator to
location V1400.
Converts the real number in the
accumulator to a binary value, and
stores the result in the accumulator.
Converts the binary value in the accumulator
to a BCD number. Note: the BCD instruction
is not needed for PID loop PV (loop PV is a
binary number).
Loads the BCD number filtered value from
the accumulator into location V1402 to use in
your application or PID loop.
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