Chapter 3 - AutomationDirect
F0-04AD-1 4-CH.
ANALOG CURRENT INPUT
CHAPTER
3
2
In This Chapter...
Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–2
Setting the Module Jumper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–4
Connecting and Disconnecting the Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . .3–4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–5
Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–6
Special V-memory Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–7
Using the Pointer in Your Control Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–9
Detecting Input Signal Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–11
Scale Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–11
Special Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–13
Module Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–15
Analog Input Ladder Logic Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–16
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Module Specifications
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The F0-04AD-1 Analog Input module offers the
following features:
• The DL05 and DL06 will read all four channels in
one scan.
• The removable terminal block makes it possible to
remove the module without disconnecting the field
wiring.
• Analog inputs can be used as process variables for the
four (4) PID loops in the DL05 and the eight (8)
PID loops in the DL06 CPUs.
• Field device burn–out is detected on all four channels
when 4–20mA range is selected.
• On-board active analog filtering and RISC-like
microcontroller provide digital signal processing to
maintain precise analog measurements in noisy
environments.
NOTE: The DL05 CPU’s analog feature for this module requires DirectSOFT32 Version 3.0c (or later) and
firmware version 2.10 (or later). The DL06 requires DirectSOFT32 version V4.0, build 16 (or later) and
firmware version 1.00 (or later). See our website for more information: www.automationdirect.com.
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
The following tables provide the specifications for the F0–04AD–1 Analog Input Module.
Review these specifications to make sure the module meets your application requirements.
Input Specifications
Number of Channels
Input Range
Resolution
Step Response
Crosstalk
Active Low-pass Filtering
Input Impedance
Absolute Maximum Ratings
Converter type
Linearity Error (End to End)
Input Stability
Full Scale Calibration Error
(Offset error not included)
Offset Calibration Error
4, single ended (one common)
0 to 20 mA or 4 to 20 mA current (jumper selectable)
12 bit (1 in 4096) for 0-20mA, scaled for 4-20mA
25.0 mS (typ) to 95% of full step change
-80 dB, 1/2 count maximum *
-3 dB at 40Hz (-12 dB per octave)
125 Ohm ± 0.1%, 1/8 W current input
-30 mA to +30 mA current input
Successive approximation
± 2 counts maximum *
± 1 count *
± 10 counts maximum, @ 20mA current input*
± 5 counts maximum @ 4mA current input *
±.4% @ 25°C (77°F)
Maximum Inaccuracy
±.85% 0 to 60°C (32 to 140°F)
±100 ppm/ °C maximum full scale calibration
Accuracy vs. Temperature
(including maximum offset change)
Recommended Fuse (external)
0.032 A Series 217 fast-acting current inputs
* One count in the specification table is equal to one least significant bit of the analog data value (1 in 4096).
General Specifications
PLC Update Rate
16-bit Data Word
Operating Temperature
Storage Temperature
Relative Humidity
Environmental air
Vibration
Shock
Noise Immunity
Power Budget Requirement
Connector
Connector Wire Size
Connector Screw Torque
Connector Screwdriver Size
4 channels per scan
12 binary data bits
0 to 60° C (32 to 140°F)
-20 to 70°C (-4 to 158°F)
5 to 95% (non-condensing)
No corrosive gases permitted
MIL STD 810C 514.2
MIL STD 810C 516.2
NEMA ICS3-304
50 mA @ 5VDC (supplied by base)
Phoenix Mecano, Inc. Part No. AK1550/8-3.5 - green
28 - 16 AWG
0.4 Nm
DN-SS1 (recommended)
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Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Setting the Module Jumper
OFF = 4 – 20
1
The position of jumper J3 determines the input signal level. You can choose between 4–20mA
and 0–20mA. The module ships with the jumper not connecting the two pins. In this position,
the expected input signal is 4–20mA. To select 0–20mA signals, use the jumper to cover both
2
pins.
3
The default jumper setting selects a
4
4–20mA signal source. The default
jumper setting does not connect the
5
two pins.
6
7
WARNING: Before removing the analog module or the terminal block on the face of the module,
8
disconnect power to the PLC and all field devices. Failure to disconnect power can result in damage to
the PLC and/or field devices.
9
Connecting and Disconnecting the Field Wiring
10
Wiring Guidelines
11
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:
• Use the shortest wiring route whenever possible.
12
• Use shielded wiring and ground the shield at the transmitter source. Do not ground the shield at both
the module and the source.
13
• Do not run the signal wiring next to large motors, high current switches, or transformers. This may
cause noise problems.
14
• 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.
A
The F0–04AD–1 does not supply power to field devices. You will need to power transmitters
separately from the PLC.
B
To remove the terminal block, disconnect power to the PLC and the field devices. Pull the
terminal block firmly until the connector separates from the module.
You can remove the analog module from the PLC by folding out the retaining tabs at the top
C
and bottom of the module. As the retaining tabs pivot upward and outward, the module’s
connector is lifted out of the PLC socket. Once the connector is free, you can lift the module
D
out of its slot.
3–4
J3
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Wiring Diagram
Use the following diagram to connect the field wiring. If necessary, the F0–04AD–1 terminal
block can be removed to make removal of the module possible without disturbing field wiring.
Typical User Wiring
See NOTE 1
Internal
Module
Wiring
A n a lo g In pu t
4 –CH A N N EL S
0 – 20 m A
4 – 20 m A
+
–
+
CH1
4–wire
–
4–20mA
Transmitter
CH1+
PWR
125
RUN
ohms
+
1
–
+ +
+
CH2
3–wire
–
4–20mA
Transmitter
CH1–
–
125
ohms
+
+
CH3
2-wire
4–20mA
–
Transmitter
CH2–
CH3+
125
ohms
125
ohms
A to D
Converter
+
CH4
2-wire
–
4–20mA
Transmitter
+
2
–
+
3
–
+
4
–
+
–
CH3–
Analog Switch
CH2+
–
+ –
+ –
+ –
+
CH4 CH3
CH2
CH1
–
+
CPU
T X1
R X1
T X2
RX2
CH4+
–
NOTE 1: Shields should be grounded at the signal
source.
NOTE 2: Connect all external power supply commons.
NOTE 3: A Series 217, 0.032A fast–acting fuse is
recommended for current loops.
F0– 04 AD–1
CH4–
– +
18-30VDC
Supply
OV
Transmitter Supply
Current Loop Transmitter Impedance
Manufacturers of transmitters and transducers specify a wide variety of power sources for their
products. Follow the manufacturer’s recommendations.
In some cases, manufacturers specify a minimum loop or load resistance that must be used with
the transmitter. The F0-04AD-1 provides 125 ohm resistance for each channel. If your
transmitter requires a load resistance below 125 ohms, you do not have to make any changes.
However, if your transmitter requires a load resistance higher than 125 ohms, you need to add
a resistor in series with the module.
Consider the following example for a transmitter being operated from a 30 VDC supply with
a recommended load resistance of 750 ohms. Since the module has a 125 ohm resistor, you need
to add an additional resistor.
R = Tr – Mr
R = resistor to add
R = 750 – 125
Tr = Transmitter Requirement
R 욷 625
Mr = Module resistance (internal 125 ohms)
Two-wire Transmitter
+
–
DC Supply
+30V
0V
Module Channel 1
R
CH1
COM
125 ohms
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0V
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Module Operation
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Channel Scanning Sequence
The DL05 and DL06 will read all four channels of input data during each scan. Each CPU
supports special V-memory locations that are used to manage the data transfer. This is discussed
in more detail beginning in the section on “Special V–memory Locations”.
Scan
DL05/DL06 PLC
Read Inputs
Execute Application Program
Read the data
Store data
Scan N
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 CPUs are synchronous with the CPU scan, the module
asynchronously monitors the analog transmitter signals and converts each signal into 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.
The module takes approximately 25 milliseconds to sense 95% of the change in the analog
signal. For the vast majority of applications, the process changes are much slower than these
updates.
NOTE: If you are comparing other manufacturers’ update times (step responses) with ours, please be aware
that some manufacturers refer to the time it takes to convert the analog signal to a digital value. Our analog
to digital conversion takes only a few microseconds. It is the settling time of the filter that is critical in
determining the full update time. Our update time specification includes the filter settling time.
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Special V-memory Locations
Formatting the Module Data
The DL05 and DL06 PLCs have special V-memory locations assigned to their respective option
slots. These V-memory locations allow you to:
• specify the data format (binary or BCD)
• specify the number of channels to scan (4 channels for the F0–04AD–1)
• specify the V-memory locations to store the input data
DL05 Data Formatting
The table below shows the special V-memory locations used by the DL05 PLC for the
F0–04AD–1.
Analog Input Module
DL05 Special V-memory Locations
Data Type and Number of Channels
Storage Pointer
V7700
V7701
Structure of V7700
Special V–memory location 7700 identifies that a F0–04AD–1 module is installed in the DL05
option slot and the data type to be either binary or BCD.
Loading a constant of 400 into V7700 identifies a
MSB
LSB
4 channel analog input module is installed in the
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0
DL05 option slot, and reads the input data values
5 4 3 2 1 0
as BCD numbers.
Loading a constant of 8400 into V7700 identifies a
MSB
LSB
4 channel analog input module is installed in the
DL05 option slot, and reads the input data values
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0
5 4 3 2 1 0
as binary numbers.
Structure of V7701
V7701 is a system V–memory location used as a pointer to a user V-memory location where the
analog input data is stored. The V–memory location loaded into V7701 is an octal number
identifying the first user V-memory location for reading the analog input data. This V–memory
location is user selectable. For example, loading O2000 causes the pointer to write Ch 1’s data
value to V2000, Ch 2’s data value to V2001, Ch 3’s data value to V2002, and Ch 4’s data value
to V2003.
You will find an example program that loads appropriate values to V7700 and V7701 on page
3–9.
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Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
DL06 Data Formatting
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Special V–memory locations are assigned to the four option slots of the DL06 PLC. The table
below shows these V-memory locations which can be used to setup the F0–04AD–1.
Analog Input Module
DL06 Special V-memory Locations
Slot No.
Data Type and Number of Channels
Storage Pointer
1
V700
V701
2
V710
V711
3
V720
V721
4
V730
V731
Setup Data Type and Number of Channels
V–memory locations 700, 710, 720 and 730 are used to set the data format to be read in either
binary or BCD, and to set the number of channels that will be active.
MSB
LSB
For example, the F0–04AD–1 is installed in slot 1.
Loading a constant of 400 into V700 sets 4 channels
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0
active, and the input data value is read as a BCD
5 4 3 2 1 0
number.
With the F0–4AD–1 in slot 1, loading a constant of
MSB
LSB
8400 into V700 sets 4 channels active, and the input
data value is read as a binary number.
1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0
Storage Pointer Setup
5 4 3 2 1 0
V–memory locations 701, 711, 721 and 731 are special locations used as storage pointers. A
V–memory address is loaded into this location as an octal number identifying the first user Vmemory location for the analog input data. This V–memory location is user selectable. For
example, loading O2000 causes the pointer to write Ch 1’s data value to V2000, Ch 2’s data
value to V2001, Ch 3’s data value to V2002, and Ch 4’s data value to V2003.
You will find an example program that loads appropriate values to V700 and V701 beginning
on page 3–10.
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Using the Pointer in Your Control Program
DL05 Pointer Method
The DL05 CPU examines the pointer values (the memory locations identified in V7700 and
V7701) on the first scan only.
The example program below shows how to setup these locations. This rung can be placed
anywhere in the ladder program or in the initial stage if you are using stage programming
instructions.
This is all that is required to read the analog input 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.
SP0
LD
K400
Loads a constant that specifies the number of channels to scan and the
data format. The upper byte selects the data format (i.e. 0=BCD,
8=Binary) and the number of channels (set to 4 for the F0–04AD–1).
- or LD
K8400
OUT
V7700
LDA
O2000
OUT
V7701
The binary format is used for displaying data on some operator
interface units. The DL05 PLCs support binary math functions.
Special V-memory location assigned to the option slot contains the data
format and the number of channels to scan.
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
The octal address (O2000) is stored here. V7701 is assigned to the
option slot 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.
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DL06 Pointer Method
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Use the special V–memory table below as a guide to setup the storage pointer in the following
example for the DL06. Slot 1 is the left most option slot. The CPU will examine the pointer
values at these locations only after a mode transition.
Analog Input Module
DL06 Special V-memory Locations
Slot No.
No. of Channels
Input Pointer
1
V700
V701
2
V710
V711
3
V720
V721
4
V730
V731
The F0–04AD–1 can be installed in any available DL06 option slot. Using the example
program from the previous page, but changing the V–memory addresses, the ladder diagram
below shows how to setup these locations with the module installed in slot 1 of the DL06. Use
the above table to determine the pointer values if locating the module in any of the other slot
locations. Place this rung anywhere in the ladder program or in the initial stage if you are using
stage programming instructions.
Like the DL05 example, this logic is all that is required to read the analog input data into Vmemory locations. Once the data is in V-memory you can perform mathematical calculations
with 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.
SP0
LD
K400
Loads a constant that specifies the number of channels to scan and the
data format. The upper byte selects the data format (i.e. 0=BCD,
8=Binary) and the number of channels (set to 4 for the F0–04AD–1).
- or LD
K8400
The binary format can be used for displaying data on some
operator interface units and the DL06 LCD display. The DL06
PLCs support binary math functions.
OUT
V700
Special V-memory location assigned to the first option slot contains the
data format and 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
V701
The octal address (O2000) is stored here. V701 is assigned to the
first option slot 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.
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Detecting Input Signal Loss
Analog Signal Loss
The F0–04AD–1 analog module can sense the loss of analog input signals in 4–20mA loops.
The Special Relays described on page 3–14 allow you to use this feature in your ladder program.
For example, in the rung below SP610 is used to pull-in coil Y1, which would be used to open
or close an external circuit.
SP610
Y1
OUT
The Special Relay SP610 detects
a loss of input signal to channel 1.
Use SP610 to trigger an alarm or
shut down a machine.
NOTE: The F0–04AD–1 analog module cannot sense the loss of analog input signals in 0–20mA loops. See
page 3–4 for information about setting the jumper to select your input type.
Scale Conversions
Scaling the Input Data
Many applications call for measurements in
Units = A H – L + L
4095
engineering units, which can be more meaningful
than raw data. Convert to engineering units using
H = High limit of the engineering
the formula shown to the right.
unit range
L = Low limit of the engineering
You may have to make adjustments to the formula
unit range
depending on the scale you choose for the
engineering units.
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 + L
4095
Units = 10 A H – L + L
4095
Units = 2024 100 – 0 + 0
4095
Units = 20240 100 – 0 + 0
4095
Units = 49
Units = 494
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The Conversion Program
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The following example shows how you would write the program to perform the engineering
unit conversion. This example assumes you have BCD data loaded into the appropriate Vmemory 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 (for a range of 0–1000).
DIV
K4095
Divide the accumulator by 4095 (the module resolution).
OUT
V2010
Store the result in V2010.
Analog and Digital Value Conversions
Sometimes it is useful to 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 easier.
Range
If you know the digital value
If you know the analog signal level
4 to 20mA
A = 16D + 4
4095
D = 4095 (A - 4)
16
0 to 20mA
A = 20D
4095
D = 4095
20
For example, if you have measured the signal as
10mA, you can use the formula to determine the
digital value that will be stored in the V-memory
location that contains the data.
D = 4095
20
D = 4095
20
D = 2048
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. 10mA
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Special Relays
The list of other Special Relays associated with the DL05 and DL06 PLCs are contained in the
DL05 User Manual and the DL06 User Manual. The following special relays are new and relate
to the status of the F0–04AD–1 module or one of its input channels.
DL05 Special Relays
DL05 Special Relays
SP600
SP601
SP602
SP603
SP610
SP611
SP612
SP613
Chan 1 input type
Chan 2 input type
Chan 3 input type
Chan 4 input type
Chan 1 input open
Chan 2 input open
Chan 3 input open
Chan 4 input open
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
DL06 SpecialRelays
DL06 Special Relays
SLOT 1
SP140
SP141
SP142
SP143
SP150
SP151
SP152
SP153
Chan 1 input type
Chan 2 input type
Chan 3 input type
Chan 4 input type
Chan 1 input open
Chan 2 input open
Chan 3 input open
Chan 4 input open
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
SP240
SP241
SP242
SP243
SP250
SP251
SP252
SP253
Chan 1 input type
Chan 2 input type
Chan 3 input type
Chan 4 input type
Chan 1 input open
Chan 2 input open
Chan 3 input open
Chan 4 input open
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
SLOT 2
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
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Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
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DL06 Special Relays (cont’d)
SLOT 3
SP340
SP341
SP342
SP343
SP350
SP351
SP352
SP353
Chan 1 input type
Chan 2 input type
Chan 3 input type
Chan 4 input type
Chan 1 input open
Chan 2 input open
Chan 3 input open
Chan 4 input open
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
SP440
SP441
SP442
SP443
SP450
SP451
SP452
SP453
Chan 1 input type
Chan 2 input type
Chan 3 input type
Chan 4 input type
Chan 1 input open
Chan 2 input open
Chan 3 input open
Chan 4 input open
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
0 = 0 - 20mA
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = xmitter signal open
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
SLOT 4
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
1 = 4 - 20mA
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
0 = xmitter signal good
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
Module Resolution
Analog Data Bits
The first twelve bits represent the analog data in binary format.
MSB
Bit
0
1
2
3
4
5
Value
1
2
4
8
16
32
Bit
6
7
8
9
10
11
Value
64
128
256
512
1024
2048
LSB
1 1 9 8 7 6 5 4 3 2 1 0
1 0
= data bits
Resolution Details
Since the module has 12-bit resolution, the analog signal is converted into 4096 counts ranging
from 0 - 4095 (212). For example, a 4mA signal would be 0 and a 20mA signal would be 4095.
This is equivalent to a binary value of 0000 0000 0000 to 1111 1111 1111, or 000 to FFF
hexadecimal.
Each count can also be expressed in terms of the signal level by using the following equation:
4 – 20mA
Resolution = H – L
4095
20mA
H = high limit of the signal range
4mA
L = low limit of the signal range
0
4095
The following table shows the smallest detectable signal change that will result in one LSB
change in the data value for each increment of the signal change.
mA Range
4 to 20mA
0 to 20mA
Signal Span
(H – L)
Divide By
Smallest Detectable
Change
16mA
20mA
4095
4095
3.907µA
4.884µA
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Analog Input Ladder Logic Filter
3–16
PID Loops / Filtering:
Please refer to the “PID Loop Operation” chapter in the DL06 or DL05 User Manual for
information on the built-in PV filter (DL05/06) and the ladder logic filter (DL06 only) shown
below. A filter must be used to smooth the analog input value when auto tuning PID loops to
prevent giving a false indication of loop characteristics.
Smoothing the Input Signal (DL06 only):
The filter logic can also be used in the same way to smooth the analog input signal to help
stabilize PID loop operation or to stabilize the analog input signal value for use with an operator
interface display, etc.
WARNING: The built-in and logic filters are not intended to smooth or filter noise generated by improper
field device wiring or grounding. Small amounts of electrical noise can cause the input signal to bounce
considerably. Proper field device wiring and grounding must be done before attempting to use the filters
to smooth the analog input signal.
Using Binary Data Format
SP1
LDD
V2000
Loads the analog signal, which is in binary format
and has been loaded from V–memory location
V2000 – 2001, into the accumulator. Contact SP1
is always on.
BTOR
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. The filter
range is 0.1 to 0.9. Smaller filter factors
increase filtering. (1.0 eliminates filtering.)
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
Copies the value in the accumulator to
location V1400.
RTOB
Converts the real number in the
accumulator to a binary value, and
stores the result in the accumulator.
OUT
V2100
Loads the binary number filtered value from
the accumulator into location V2100 to use in
your application or PID loop.
DL05/06 Option Modules User Manual; 7th Ed. Rev. A, 08/11
Chapter 3: F0-04AD-1 4-Ch. Analog Current Input
NOTE: Be careful not to do a multiple number conversion on a value. For example, if you are using the pointer
method in BCD format to get the analog value, it must be converted to binary (BIN) as shown below. If you
are using the pointer method in Binary format, the conversion to binary (BIN) instruction is not needed.
Using BCD Data Format
SP1
LD
V2000
Loads the analog signal, which is in BCD format
and has been loaded from V–memory location
V2000, into the accumulator. Contact SP1
is always on.
BIN
Converts the BCD value in the accumulator
to binary.
BTOR
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. The filter
range is 0.1 to 0.9. Smaller filter factors
increase filtering. (1.0 eliminates filtering.)
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
Copies the value in the accumulator to
location V1400.
RTOB
Converts the real number in the
accumulator to a binary value, and
stores the result in the accumulator.
BCD
Converts the binary value in the accumulator
to a BCD number. Note: The BCD instruction
is not needed to PID loop PV (loop PV is a
binary number).
OUT
V1402
Loads the BCD number filtered value from
the accumulator into location V1402 to use in
your application or PID loop.
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