Analog F2-4AD2DA User Manual

F2-4AD2DA 4-Ch. In / 2-Ch. Out AnAlOg COmbInAtIOn

In This Chapter...

Module Speciﬁcations ............................................................................................. 14-2

Connecting the Field Wiring ................................................................................... 14-5

Module Operation ................................................................................................... 14-8

Writing the Control Program ................................................................................ 14-13

Chapter

Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

CH1+

CH3+

OUT-

CH2+

IN/

OUT

80mA

OUT

Module Speciﬁcations

The F2-4AD2DA analog current input/output module provides several hardware features:

• On-board 250 ohm, 1/2 watt precision resistors provide substantial over-currentprotection for 4–20 mA current loops.

• Analog inputs and outputs are optically isolated from the PLC logic.

• The module has a removable terminal block so the module can be easily removed or changed without disconnecting the wiring.

• All input and output channels can be updated in one scan if either a D2-240, a D2-250-1, a D2-260 or a D2-262 CPU is used in the PLC.

• On-board active analog filtering and RISC-like microcontroller provide digital signal processing to maintain precision analog measurements in noisy environments.

• Low-power CMOS design requires less than 80mA from an external 24VDC power supply.

IN/

OUT

F2-4AD2DA

-4AD2DA

18-26.4VDC

-26.4VD 80mA ANALOG

NALOG

4 IN/2 OUT

4 IN/2 4-20m

4-20mA

+24V

+24

CH1+

CH2+

H2+

CH3+

H4+

CH4+

OUT-

OUT

H1+

CH1+

CH2+

F2-4AD2DA

-4AD

F2-4AD2DA

ANALOG

NAL

14-2

The following tables provide the speciﬁcations for the F2-4AD2DA analog current input/ output module. Review these speciﬁcations to make sure the module meets your application requirements.

Input Specifications

Number of Input Channels Range Resolution Input Impedance Maximum Continuous Overload Input Stability Crosstalk Common Mode Rejection Active Low-Pass Filter Step Response Full Scale Calibration Error Offset Calibration Error

Maximum Inaccuracy

Recommended External Fuse

4, single ended (one common) 4–20 mA 12 bit (1 in 4096) 250q, ±0.1%, 1/2 W, 25ppm / °C current input resistance ±40mA, each current input ±1 count

-70dB, 1 count maximum

-50dB @ 800Hz

-3dB @ 50Hz, 2 poles (-12dB per octave) 10ms to 95% ±12 counts maximum, @ 20mA current input ±8 counts maximum, @ 4mA current input ±0.3% @ 25°C (77°F) ±0.45% @ 0–60°C (32–140°F)

0.032 A, series 217 fast-acting, current inputs

DL205 Analog I/O Manual, 7th Edition, Rev. G

Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Number of Output Channels Range Resolution Peak Withstanding Voltage External Load Resistance Loop Supply Voltage Range Maximum Load / Power Supply Linearity Error (best fit) Settling Time

Maximum Inaccuracy

Full Scale Calibration Error Output Calibration Error

General Module Specifications

Digital Input and Output Points Required

PLC Update Rate

Power Budget Requirement External Power Supply Requirement

Accuracy vs. Temperature

Operating Temperature Storage Temperature Relative Humidity Environmental Air Vibration Shock Noise Immunity

Output Specifications

2, single ended (one common) 4–20 mA 12 bit (1 in 4096) 75VDC, current outputs 0q minimum, current outputs 18–30 VDC, current outputs 910q / 24V, 620q / 18V, 1200q / 30V, current outputs ±1 count (± 0.025% of full scale) maximum 100μs maximum (full scale change) ±0.1% @ 25°C (77°F) ±0.3% 0–60°C (32–140°F) ±5 counts @ 20mA current output ±3 counts @ 4mA current output

16 point (X) Inputs 16 point (Y) Outputs 4 input channels per scan maximum

(D2-240, D2-250-1, D2-260 and D2-262 CPU) 2 output channels per scan maximum

(D2-240, D2-250-1, D2-260 and D2-262 CPU) 1 input and 1 output channels per scan maximum (D2-230 CPU) 60mA @ 5VDC (supplied by the base)

24VDC (±10%), 80mA max. plus 20mA per loop output

±45 ppm / °C full scale calibration range (including maximum offset change).

0–60°C (32–140°F) –20°C to 70°C (-4°F to 158°F) 5–95% (non-condensing) No corrosive gases permitted MIL STD 810C 514.2 MIL STD 810C 516.2 NEMA ICS3-304

Combination Analog Conﬁguration Requirements

The F2-4AD2DA analog current input/output module requires 16 discrete input points and 16 discrete output points. The module can be installed in any slot of a DL205 system, except when the D2-230 CPU is used. The available power budget may also be a limiting factors. Check the DL205 PLC User Manual for the particular model of CPU and I/O base being used for more information regarding power budget and number of local, local expansion or remote I/O points.

DL205 Analog I/O Manual, 7th Edition, Rev. G

14-3

Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

F2-4AD2DA

Special Placement Requirements (D2-230 and Remote I/O Bases)

It is important to examine the conﬁguration if a D2-230 CPU is being used with a multiplexing program. As can be seen in the section on Writing the Control Program, V-memory locations are used to manage the analog data. If the module is placed in a slot so that either the input or the output points do not start on a V-memory boundary, the program instructions aren’t able to access the data. This also applies when placing this module in a remote base using a D2-RSSS in the CPU slot.

Correct!

Slot 0Slot1 Slot 2Slot3 Slot 4

8pt

BSLBSM

Y 2 0

V40400

8pt

Input

X10

X17

X 3 7

Input

V40501

Y 3 7

16pt

Output

Y17

V40500V40502

16pt

In /Out Output

Y20

X20

-Y37

X37

V40401

8pt

Y40

Y47

BSLBSM

X 2 0

Data can be read and written correctly because the input and output points start on a V-memory boundary address as seen in the table on the following page.

Incorrect

F2-4AD2DA

Slot 0Slot1 Slot 2Slot 3Slot 4

8pt

Input

8pt

Input

X10

-X17

8pt

Output

16pt

In /Out Output

Y10

X20

-Y27

X37

16pt

Y30

Y47

14-4

V40400

Output data is split over two locations, so instructions cannot write data from a D2-230.

V40501

Y 3 7

BSLBSM

DL205 Analog I/O Manual, 7th Edition, Rev. G

V40500

V40401 V40500 V40501V40502

V40500

Y7Y 1 0

V40501

BSLBSM

Y 0

Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

To use the V-memory references required for a D2-230 CPU, the ﬁrst input and output addresses assigned to the module must be one of the following X and Y locations. The table also shows the V-memory addresses that correspond to these locations.

X0 X20 X40 X60 X100 X120 X140 X160

V40400 V40401 V40402 V40403 V40404 V40405 V40406 V40407

Y0 Y20 Y40 Y60 Y100 Y120 Y140 Y160

V40500 V40501 V40502 V40503 V40504 V40505 V40506 V40507

Connecting the Field Wiring

Wiring Guidelines

Your company may have guidelines for wiring and cable installation. If so, check the guidelines before beginning the installation. Here are some general things to consider:

• Use the shortest wiring route whenever possible.

• Use shielded wiring and ground the shield at the transmitter source. Do not ground the shield at both the module and the source.

• Do not run the signal wiring next to large motors, high current switches, or transformers. This may cause noise problems.

• 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.

Loop Power Supply Requirements

The F2-4AD2DA module requires at least one ﬁeld-side power supply. The same or separate power sources can be used for the module supply and the current transmitter supply. The F2-4AD2DA module requires 24VDC (at 80mA) and each current loop requires 20mA (a total of 120mA for six current loops), from the external power supply.

The DL205 AC bases have a built-in 24VDC power supply that provide up to 300mA of current. This can be used instead of a separate supply. Check the power budget to be safe.

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 current requirements, and the transmitter’s minus (-) side and the module supply’s minus (-) side are connected together.

WARNING: If the internal 24VDC base power is used, be sure to calculate the power budget. Exceeding the power budget can cause unpredictable system operation that can lead to a risk of personal injury or equipment damage.

DL205 Analog I/O Manual, 7th Edition, Rev. G

14-5

Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

Example:

(R)

in series with themodule.

The DL205 base has a switching type power supply. As a result of switching noise, ±3–5 counts of instability may be noticed in the analog input data if the base power supply is used. If this is unacceptable, try one of the following:

• Use a separate linear power supply.

• Connect the 24VDC common to the frame ground, which is the screw terminal marked “G” on the base.

When using these methods, the input stability is rated at ±1 count.

Current Loop Transmitter Impedance

Standard 4–20 mA transmitters and transducers can operate from a wide variety of power supplies. Not all transmitters are alike and the manufacturers often specify a minimum loop or load resistance that must be used with the transmitter.

The F2-4AD2DA provides 250 ohm resistance for each input channel. If the transmitter being used requires a load resistance below 250 ohms, adjustments do not have to be made. However, if the transmitter requires a load resistance higher than 250 ohms, add a resistor in series with the module.

Consider the following example for a transmitter being operated from a 30VDC supply with a recommended load resistance of 750 ohms. Since the module has a 250 ohm resistor, add an additional resistor.

14-6

R= Tr −Mr R= 750 −250

R≥ 500

Two-wire Transmitter

DC Supply

+30V

In theexample, add a500 ohm resistor

R--resistortoadd

Tr -- Transmitter totalresistancerequirement

Mr -- Moduleresistance(internal 250 ohms)

+--

DL205 Analog I/O Manual, 7th Edition, Rev. G

Module Channel 1

IN1+

IN--

250 ohms

Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Wiring Diagram

The F2-4AD2DA module has a removable connector to simplify wiring. 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 loop power supplies. If it is desired to use only one external supply, just combine the supply’s positive (+) terminals into one node, and remove the loop supply.

NOTE 1: Shields should be connected at their respective signal source. NOTE 2: Unused channels should remain open (no connections) for minimum power consumption. NOTE 3: More than one external power supply can be used provided all the power supply commons are connected

together.

NOTE 4: A series 217, 0.032 A, fast-acting fuse is recommended for 4–20 mA current input loops. NOTE 5: If the power supply common of an external power supply is not connected to 0V on the module, then the output

of the external transmitter must be isolated. To avoid “ground loop” errors, recommended 4–20 mA transmitter types are: a. For 2 or 3 wire: Isolation between input signal and power supply. b. For 4 wire: Isolation between input signal, power supply, and 4–20 mA output. NOTE 6: If an analog channel is connected backwards, then incorrect data values will be returned for that channel. Input signals in the ±4mA range return a zero value. Signals in the -4 to -40 mA range return a non-zero value. NOTE 7: To avoid small errors due to terminal block losses, connect 0V, IN– and OUT– on the terminal block as shown. The module’s internal connection of these nodes is not sufﬁcient to permit module performance up to the accuracy speciﬁcations. NOTE 8: Choose an output transducer resistance according to the maximum load / power supply listed in the Output Speciﬁcations table.

See NOTE1

-- +

CH1

4--wire

4--20m A

Transmitter

CH2

3--wire

4--20m A

Transmitter

CH3

2-wire

4--20m A

Transmitter

CH4

2-wire

4--20m A

Transmitter

Ch 1 load 0--910

(@ 24V)

Ch 2 load

0--910

(@ 24V)

See NOTE8

Module Supply

24VDC

Fuse

See NOTE1

Fuse

Loop Supply

0VDC

+24 VDC

IN--

IN1+

IN2+

IN3+

IN4+

OUT--

OUT1+

OUT2+

Internal Module

Wiring

250

Converter

DC to DC

Converter

Ch 1

Current sinking

Converter

Ch 2

Current sinking

+15V

--15V

A to D

D to A

+5V

IN/

OUT

F2-4AD2DA

18-26.4VDC 80mA ANALOG 4 IN/2 OUT 4-20mA

+24V

CH1+

CH2+

CH3+

CH4+

OUT-

OUT

CH1+

CH2+

F2-4AD2DA

ANALOG

DL205 Analog I/O Manual, 7th Edition, Rev. G

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

Module Operation

Before beginning to write the control program, it is important to take a few minutes to understand how the module processes the analog signals.

Input Channel Scanning Sequence (Multiplexing) for a D2-230 CPU

The F2-4AD2DA module can supply different amounts of data per scan, depending on the type of CPU being used. The D2-230 can obtain one channel of input data per CPU scan. Since there are four channels, it can take up to four scans to get the data for all channels. Once all channels have been scanned the process starts over with channel 1. Unused channels are not processed, so if only two channels are selected, each channel will be updated every other scan.

Scan

Read Inputs

ExecuteApplic ationProgram

Store data

WritetoOutputs

Scan NRead the data

Scan N+1

Scan N+2

Scan N+4

System With

D2-230 CPU

Channel1

Channel2

Channel3

Channel4Scan N+3

Channel1

Input Channel Scanning Sequence (Pointer Method) for D2-240, D2-250-1, D2-260 and D2-262 CPUs

If a D2-240, a D2-250-1, a D2-260or a D2-262 CPU is being used, the input data for all four channels can be obtained in one scan. This is because the D2-240, D2-250-1, D2-260 and D2-262 CPUs 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 later in this chapter.

Scan

Read Inputs

ExecuteApplicationProgram

Store data

WritetoOutputs

Scan NRead the data

Scan N+1

Scan N+2

Scan N+3

Scan N+4

System With

DL240, D2-250--1

DL260, D2-262

CPU

Ch1, 2, 3, 4

Ch 1, 2, 3, 4

Ch1, 2, 3, 4

Ch 1, 2, 3, 4

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Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Output Channel Update Sequence (Multiplexing) for a D2-230 CPU

If a D2-230 CPU is used, only one channel of data can be sent to the output module on each scan. Since there are two channels, it can take two scans to update both channels. However, if only one channel is being used, then that channel can be updated on every scan.

Scan

Read inputs

ExecuteApplication Program

Calculatethe data

Write data

Writetooutputs

Scan N

Scan N+1

Scan N+2

Scan N+3

Scan N+4

System With

DL230 CPU

Channel1

Channel2

Channel1

Channel2

Channel1

Output Channel Update Sequence (Pointer Method) for D2-240, D2-250-1, D2-260 and D2-262 CPUs

If either a D2-240, D2-250-1, D2-260 or D2-262 CPU is used with the pointer method, both channels can be updated on every scan. This is because these CPUs support 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 later in this chapter.

System With

Scan

Read inputs

ExecuteApplicationProgram

Calculatethe data

Writedata

Scan N

Scan N+1

Scan N+2

Scan N+3

D2-240, D2-250-- 1 D2-260 or D2-262

CPU

Channel1,2

Scan N+4

Writeto outputs

Channel1,2

DL205 Analog I/O Manual, 7th Edition, Rev. G

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

F2-4AD2DA

V40401

Understanding the I/O Assignments

Remember that the F2-4AD2DA requires 16 discrete input points and 16 discrete output points. These points can be used to obtain:

• An indication of which channel is active,

• The digital representation of the analog signal and,

• Module diagnostic information.

If a D2-240, D2-250-1, D2-260 or D2-262 CPU is being used, these bits may never have to be used, but it may be an aid to help understand the data format.

Since all I/O points are automatically mapped into V-memory, the location of the data words that will be assigned to the module can simply be determined.

NotUsed

Slot 0Slot1 Slot 2Slot3 Slot 4

8pt

Input

V40400

V40501

Output Data Bits

BSLBSM

Y 2

16pt

Input

Output

X10

X17

Y17

V40500V40502

16pt

In /Out Output

Y20

X20

-Y37

X37

V40401

InputDataBits

Y40

Y47

8pt

BSLBSM

X 2

The individual bits in this data word location represent speciﬁc information about the analog signal.

Input Data Bits

The ﬁrst twelve bits of the input word 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

BSLBSM

1 5

= databits

01413121110987654321

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Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

=channel inputs

V40401

Active Channel Indicator Bits

Two of the inputs are binary encoded to indicate the active input channel. Remember, the V-memory bits are mapped directly t o discrete inputs. The module automatically turns these inputs On and Off to indicate the active input channel for each scan.

Scan X36 X37 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

Diagnostic Indicator 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 the analog data is not valid. After the ﬁrst scan, the input will normally turn on when environmental (electrical) noise problems are present. The programming examples in the next section will show how this input can be used. The wiring guidelines presented earlier in this chapter provide steps that can help reduce noise problems.

V40401

=diagnosticinputs

BSLBSM

X 2 0

BSLBSM

X 2 0

NOTE: When using the pointer method, the value placed into the V-memory location will be 8000 instead of the bit being set.

Module Failure – The last diagnostic input (X37 in this example) indicates that the analog module is not operating. For example, if the 24VDC input power is missing, or if the terminal block is loose, then the module will turn on this input point. The module will also return a data value of zero to further indicate there is a problem. This input point cannot detect which individual channel is at fault. If the cause of the failure goes away, the module turns this bit off.

Output Data Bits

The ﬁrst twelve bits of the output word 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

V40501

BSLBSM

01110987654321

= databits

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

V40401

Output Channel Selection Bits

Two of the outputs select the active channel. Remember, the V-memory bits are mapped directly to discrete outputs. Turning a bit Off selects its channel. By controlling these outputs, the channel(s) to be updated can

be selected.

Y35 Y34 Channel

On Off 1 Off On 2 Off Off 1 & 2 (same data to both channels) On On None (both channels hold current values)

Module Resolution

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. The diagram shows how this relates to the signal range.

Each count can also be expressed in terms of the signal level by using the equation shown.

H=high limitofthe signal range

L=low limit of thesignal range

20mA

4mA

Resolution =

=channel inputs

4-- 20mA

0 4095

H − L

4095

BSLBSM

X 2 0

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DL205 Analog I/O Manual, 7th Edition, Rev. G

16mA/4095 =3.907 Aper count

Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Multiplexing method

Writing the Control Program

Before starting to write the program, some supplemental examples can be very helpful to the programmer, such as:

• Input power failure detection

• Output data calculation

• Input data scaling

Analog Input Failure Detection

The analog module has a microcontroller that can diagnose analog input circuit problems. Ladder logic can be written to detect these problems. The following rung shows an input point that would be assigned if the module was used as shown in the previous and following examples.

V2000 K0

Pointers method

V2000 K8000

Calculating the Digital Value

The control program must calculate the digital value that is sent to the analog output. Several methods can be used to do this, but the best method is to convert the values to engineering units. This is accomplished by using the formula shown.

Adjustments may need to be made to the formula depending on the scale of the engineering units.

Consider the following example which controls pressure from 0.0–99.9 PSI. Using the formula will calculate the digital value to be sent to the analog output. The example shows the conversion required to yield 49.4 PSI. The multiplier of 10 is used because the decimal portion of 49.4 cannot be loaded in the program, so it is shifted right one decimal place to make a usable value of 494.

X37

V-memory loc ationV2000 holds channel1data.When a datavalue

of zero is returned and inputX37 is

OUT

on,thenthe analog channel is not operating properly.

V-memory loc ationV2000 holds channel1data. Whenadatavalue

OUT

of 8000 is returned,then the analog channelisnot operatingproperly.

A = U H–L

A = Analog Value (0–4095)

U = Engineering Units

H = High limit of the engineering unit range

L = Low limit of the engineering unit range

4095

A = 10U 10 (H–L) (1000–0)

4095

A = 494

4095

DL205 Analog I/O Manual, 7th Edition, Rev. G

A = 2023

14-13

Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

The example program below shows how to write the program to perform engineering unit conversions. This example will work with all CPUs and assumes that the engineering unit values have been calculated or loaded and stored in V2300 and V2301 for channels 1 and 2 respectively. Also, the ﬁnal values are moved to V2004 and V2005, which are memory locations that are used in the following examples. Any user V-memory locations can be used, but they must match the locations that are speciﬁed as the source for the output data (see the next section for an example).

NOTE: Since the D2-250 can do math operations in BCD format, it is better to perform the math calculations in BCD.

SP1

LD V2300

MUL K4095

DIV K1000

OUT V2004

LD V2301

MUL K4095

DIV K1000

OUT V2005

TheLDinstruc tion loads the engineering unitsusedwithchannel 1 int o theaccumulator.This exampleassumesthe numbers areBCD.Since SP1 is used, this rung automatic ally executes on every scan. Yo ucould alsouse an X, C, etc. permissive contact.

Multiply theaccumulator by 4095 (tostart theconversion).

Divide theaccumulator by 1000 (becauseweusedamultiplierof 10, we have to use 1000 instead of 100).

Storethe BCDresult in V2004 (the actual stepsrequiredtosendthe data areshownlater).

TheLDinstruc tion loads the engineering unitsusedwithchannel 2 int o theaccumulator.This exampleassumesthe numbers areBCD.Since SP1 is used, this rung automatic ally executes on every scan. Yo ucould alsouse an X, C, etc. permissive contact.

Multiply theaccumulator by 4095 (tostart theconversion).

Divide theaccumulator by 1000 (becauseweusedamultiplierof 10, we have to use 1000 instead of 100).

Storethe BCDresult in V2005 (the actual stepsrequiredtosendthe data areshownlater).

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DL205 Analog I/O Manual, 7th Edition, Rev. G

Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Note,thisexample uses SP1, whic hisalwayson. You

Scaling the Input Data

Most applications usually require measurements in engineering units, which provide more meaningful data. This is accomplished by using the conversion formula shown.

Adjustments to the formula may be needed depending on the scale chosen for the engineering units.

For example, if pressure (PSI) is to be measured with a scale of 0.0–99.9, a multiplication factor of 10 would be needed in order to imply a decimal place when the value is used in the user program.

Analog Value of 2024, slightly less than half scale, should yield 49.4 PSI.

Example without multiplier Example with multiplier

Units = A 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

H–L

Units = A 4095

Units = 2024 4095

H–L

Units = 49

The following rung of logic is an example showing how the program can be written to perform the engineering unit conversion. This example assumes the data is in BCD format before being loaded into the appropriate V-memory locations using instructions that apply to the CPU module being used.

could alsouse an X, C, etc. permissive contact.

SP1

100–0

LD V2000

MUL K1000

DIV K4095

OUT V2010

Units = 10A 4095

Units = 20240 4095

H–L

100–0

Units = 494

Load channel1data to theaccumulator.

Multiply theaccumulatorby 1000 (tostart theconv ersion).

Divide theaccumulatorby4095.

Storethe result in V2010.

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

SP0

location to determine exactlywhereto obtain the output data.

Read / Write Program (Pointer Method) for D2-240, D2-250-1, D2-260 and D2-262 CPUs

The D2-240, D2-250-1, D2-260 and D2-262 CPUs have special V-memory locations assigned to each base slot that simpliﬁes the programming requirements. The V-memory locations:

• Specify the number of input and output channels to scan.

• Specify the storage location for the input data.

• Specify the source location for the output data.

NOTE: In order to use the pointer method, D2-250 CPUs must have ﬁrmware revision 1.09 or later, and F2-4AD2DA modules must be revision C1 or later

The following example rung of logic shows how to setup these locations. Place this rung anywhere in the ladder program, or in the initial stage if stage programming instructions are being used.

In this example V2000 and V2004 are used to store the calculated values, but any V-memory location can be used. For this example, the analog module is installed in slot 3. Be sure to use the V-memory locations for which ever slot the module is placed in your system. The pointer method automatically converts values to binary.

K0402

OUT V7663

LDA O2000

OUT V7673

LDA O2004

OUT V7703

-or-

K8482

Loads aconstantthatspecifies the numberofchannelstoscan and the dataformat. The upperbyte, most significant nibble (MSN)selects the dataformat(0=BCD, 8=Binary),the LSN selects the number of input channels(1, 2, 3, or 4).The lower byte,mostsignificant nibble (MSN)selects the dataformat (0=BCD, 8=Binary), theLSN selects the numberof output channels(1, 2).

Thebinaryformatisusedfor displaying dataonsome operator interfaces.The D2-230/D2-240CPUsdo not supportbinarymath functions, whereas theD2-250 does.

Special V-memory location assignedtoslot3that contains the numberofinput and output channels.

This constant designatesthe firstV-memory loc ationthatwill be used to storethe input data. Forexample,the O2000 entered here would mean: Ch1--V2000, Ch 2--V2001, Ch 3--V2002,Ch4-- V2003

Theconstant O2000isstored here. V7673isassigned to slot 3 and

acts as a pointer,whichmeansthe CPUwilluse thevalue in this

locationtodetermine exactlywheretostore theincoming data.

This constant designatesthe firstV-memorylocationthatwillbe used to obtain the analog outputdata. Forexample, theO2004 entered here wouldmean: Ch1--V2004,Ch2-- V2005.

Theconstant O2004isstored here. V7703isassigned to slot 3 and acts as a pointer,whichmeansthe CPUwilluse thevalue in this

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Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

The following tables show the special V-memory locations used by the D2-240, D2-250-1, D2-260 and D2-262 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 the D2-230 (multiplexing) method is used, verify that these addresses in the CPU are 0 (zero).

The table below applies to the D2-240, D2-250-1, D2-260 and D2-262 CPU base.

CPU Base: Analog In/Out Module Slot-Dependent V-memory Locations

Slot No. of Channels Input Pointer Output Pointer

The table below applies to the D2-250-1, D2-260 or D2-262 CPU base 1.

Expansion Base D2-CM #1: Analog In/Out Module Slot-Dependent V-memory Locations

Slot. No. of Channels Input Pointer Output Pointer

The table below applies to the D2-250-1, D2-260 or D2-262 CPU base 2.

Expansion Base D2-CM #2: Analog In/Out Module Slot-Dependent V-memory Locations

Slot No. of Channels Input Pointer Output Pointer

The table below applies to the D2-260 and D2-262 CPU base 3.

0 1 2 3 4 5 6 7 V7660 V7661 V7662 V7663 V7664 V7665 V7666 V7667 V7670 V7671 V7672 V7673 V7674 V7675 V7676 V7677 V7700 V7701 V7702 V7703 V7704 V7705 V7706 V7707

0 1 2 3 4 5 6 7 V36000 V36001 V36002 V36003 V36004 V36005 V36006 V36007 V36010 V36011 V36012 V36013 V36014 V36015 V36016 V36017 V36020 V36021 V36022 V36023 V36024 V36025 V36026 V36027

0 1 2 3 4 5 6 7 V36100 V36101 V36102 V36103 V36104 V36105 V36106 V36107 V36110 V36111 V36112 V36113 V36114 V36115 V36116 V36120 V36121 V36122 V36123 V36124 V36125 V36126 V36127

V36117

Expansion Base D2-CM #3: Analog In/Out Module Slot-Dependent V-memory Locations

Slot No. of Channels Input Pointer Output Pointer

0 1 2 3 4 5 6 7 V36200 V36201 V36202 V36203 V36204 V36205 V36206 V36207 V36210 V36211 V36212 V36213 V36214 V36215 V36216 V36220 V36221 V36222 V36223 V36224 V36225 V36226 V36227

The table below applies to the D2-260 and D2-262 CPU base 4.

Expansion Base D2-CM #4: Analog In/Out Module Slot-Dependent V-memory Locations

Slot No. of Channels Input Pointer Output Pointer

0 1 2 3 4 5 6 7 V36300 V36301 V36302 V36303 V36304 V36305 V36306 V36307

V36310 V36311 V36312 V36313 V36314 V36315 V36316

V36320 V36321 V36322 V36323 V36324 V36325 V36326 V36327

DL205 Analog I/O Manual, 7th Edition, Rev. G

V36217

V36317

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

Loaddatawhenmoduleis not busy.

Read Input Values (Multiplexing)

The D2-230 CPU does not use special V-memory locations for transferring data. Since all channels are multiplexed into a single data word, the control program must be setup to determine which channel is being read. Since the module appears as X input points to the CPU, simply use the active channel status bits to determine which channel is being read.

Note, this example is for a module installed in slot 3, as shown in the previous examples. The addresses used would be different if the module was used in a different slot. These rungs can be placed anywhere in the program or if stage programming is being used, place them in a stage that is always active.

The following multiplexing example can be used with all of the DL205 CPUs.

X36

StoreChannel 1

X36 X34 X35

StoreChannel 2

X36 X34 X35

StoreChannel 3

X36 X34 X35

StoreChannel 4

X36 X34 X35

LD V40401

ANDD KFFF

BCD

OUT V2000

OUT V2001

OUT V2002

OUT V2003

Loadsthe complete datawordintothe accumulator. TheV-memorylocation depends on theI/O configuration.See Appendix Afor thememorymap.

This instruction masksthe channel identification bits. Without this,the values used will not be correct so do not forget to include it.

It is usually eas ier to perform math operationsin BCD, Yo ucan leave out this instructionifyour applicationdoes not require it.

When themoduleis not busyand X36, X34and X35 areoff,channel 1dataisstoredinV2000.

When themoduleis not busyand X34ison and X35 and X36are off, channel2dataisstoredinV2001.

When themoduleis not busyand X34 and X36are off and X35ison, channel3data is stored in V2002.

When themoduleis not busyand both X34and X35are on and X36isoff,channel4data is stored in V2003.

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Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

Storechannel1when module is not busy.

Load data into theaccumulator.

would be different.

Single Input Channel Selected (Multiplexing)

Since it isn’t necessary to determine which channel is selected, the single channel example shown below can be implemented in the user program.

Write Output Values

X36 X34 X35

LD V40401

ANDD KFFF

BCD

OUT V2000

Loadsthe complete datawordintothe accumulator. TheV-memorylocation depends on the I/O configuration. SeeAppendix Afor thememorymap.

This instructionmasks thechannelidentification bits.Without this ,the values used will not be correct so do notforget to include it.

It is usually easier to performmath operations in BCD. Youcan leave out this instruction if your application does not requir eit.

When themoduleis not busy andX34 and X35are off, channel1dataisstoredinV2000.

(Multiplexing)

Since all channels are multiplexed into a single data word, the control program can be setup to determine which channel to write the data to. Since the module appears as Y output points to the CPU, it is simple to use the channel selection outputs to determine which channel to update.

This example is a two-channel multiplexer that updates each channel on alternate scans. Relay SP7 is a special relay that is On for one scan, then Off for one scan. This multiplexing example can be used with all of the DL205 CPUs.

NOTE: Binary data must be sent to the output module. If the data is already in binary format, do not use the BIN instruction shown in this example.

SP7

Send data to V-memory assigned to themodule.

SP1

Select thechannelto update.

SP7

LD V2000

LD V2001

BIN

OUT V40501

Loadsthe datafor channel 1 intothe ac cumulator.

Loadsthe datafor channel 2 intothe ac cumulator.

Convertthe data to binar y(youmustomitthisstepif youhaveconv ertedthe data elsewhere). SP1 is always on.

TheOUT instruc tion sends the datatothe module.Our examplestartswithV40501,but theactualvalue dependsonthe location of themoduleinyour application.

Y34

Selects channel1for update when Y34isOFF (Y35--ON deselects channel 2).Note, Y34and Y35are

OUT

used due to thepreviousexamples. If themodule was installedinadifferent I/Oarrangement, theaddresses would be different.

Y35

Selects channel2for update when Y35isOFF (Y34--ON deselects channel 1).Note, Y34and Y35are

OUT

used due to thepreviousexamples. If themodule was installedinadifferent I/Oarrangement, addresses

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Chapter 14: F2-4AD2DA, 4-Ch. In / 2-Ch. Out Analog Combination

TheLD instruc tion loadsthe data intothe

RST

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.

SP1

LD V2000

BIN

ANDD K0FFF

OUT V40501

accumulator.Since SP1 is used, this rung automatically exec utes on every scan. Yo ucould alsouse an X, C, etc. permis sive contac t.

TheBIN instruction converts theaccumulator data to binary (you must omit this step if youhav e already convertedthe data elsewhere) .

TheANDD instructionmasks offthe channelselec t bitstoprevent an accidental channelselection.

TheOUT instruc tion sends the datatothe module. Ourexample starts with V40501, but the actual value dependsonthe locationofthe moduleinyour application.

Y34

Y34--OFF selects channel 1for updating.

RST

Y35

Y35--ON deselects channel 2(do not update).

OUT

Write the same Data to Both Channels

If both channel select outputs are Off, then both channels will be updated with the same data.

SP1

LD V2000

BIN

ANDD K0FFF

OUT V40501

accumulator.Since SP1 is used, this rung automatically ex ecutes on every scan. Youcould alsouse an X, C, etc. permis sive contact.

TheBIN instruction converts theaccumulator data to binary (you must omit this step if youhave already convertedthe data elsewhere).

TheANDD instructionmasks offthe channelselect bitstoprevent an accidental c hannelselection.

TheOUT instruc tion sends the datatothe module. Ourexample starts with V40501, but the actual value dependsonthe locationofthe moduleinyour application.

Y34

Y34--OFF selects c hannel 1for updating.

RST

Y35

Y35--OFF selects c hannel 2for updating.

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.

Range If the digital value is known

4–20 mA

16D + 4

A =

4095

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.

If the analog signal level is

known.

4095

D =

(A – 4)

4095

D = 16

4095

D = 16

(A – 4)

(10mA – 4)

D = (255.93) (6) D = 1536

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Chapter 14: F2-4AD2DA 4-Ch. In / 2-Ch. Out Analog Combination

SP1

Filtering Input Noise (D2-250-1, D2-260 and D2-262 CPUs Only)

Add the following logic to ﬁlter and smooth analog input noise in D2-250-1, D2-260 or D2-262 CPUs. This is especially useful when using PID loops. Noise can be generated by the ﬁeld device and/or induced by ﬁeld wiring.

In the following example, the analog value in BCD is first converted to a binary number. Memory location V1400 is the designated workspace in this example. The MULR instruction is the filter factor, which can be from 0.1–0.9. The example uses 0.2. A smaller filter factor increases filtering. A higher precision value can be used, 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 the pointer method is used to get the analog value, it is in BCD and must be converted to binary. However, if the conventional method is used to read a value and the ﬁrst twelve bits are masked, then it is already in binary and no conversion using the BIN instruction is needed.

NOTE: Please review intelligent instructions (IBox) in Chapter 5, which simplify this and other functions. The IBox instructions are supported by the D2-250-1, D2-260 and D2-262.

LD V2000

BIN

BTOR

SUBR V1400

MULR R0.2

ADDR V1400

OUTD V1400

RTOB

BCD

OUT V1402

Loadsthe analog signal, whichisaBCDvalue and has beenloadedfromV-memorylocation V2000,intothe accumulator.Contact SP1 is always on.

Converts theBCD value in theaccumulator to binary. Remember,thisinstruction is not neededifthe analog value is originally broughtinasabinary number.

Converts thebinaryvalue in theaccumulator toarealnumber.

Subtractsthe real numberstoredinlocation V1400 from thereal numberinthe accumulator, and stores theresultinthe accumulator.V1400 is thedesignatedworkspaceinthisexample.

Multipliesthe real number in the accumulatorby0.2 (the filter factor), and stores theresultinthe accumulator.This is thefiltered value.

Adds thereal numberstoredin locationV1400 to therealnumber filtered valueinthe accumulator, and stores theresult in theaccumulator.

Copies thevalue in theaccumulator to location V1400.

Converts thereal number in the accumulatortoabinaryvalue, and stores theresult in theaccumulator.

Converts thebinar yvalue in theaccumulator to aBCD number. Note: TheBCD instruc tion is not needed forPID loop PV (loopPVisa binary number).

Loads theBCD number filtered valuefrom theaccumulator intolocationV1402touse in your applicationorPID loop.

DL205 Analog I/O Manual, 7th Edition, Rev. G

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Analog F2-4AD2DA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Connecting the Field Wiring

Module Operation

Writing the Control Program