Analog F2–08DA–1 User Manual

F2-08DA-1, 8-ChAnnel AnAlog Current output

In This Chapter...

Module Speciﬁcations ............................................................................................. 10-2

Connecting and Disconnecting the Field Wiring ................................................... 10-5

Module Operation ................................................................................................... 10-7

Writing the Control Program ................................................................................ 10-11

Chapter

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Module Speciﬁcations

The F2-08DA-1 Analog Output module provides several hardware features:

• Supported by D2-230, D2-240, D2-250-1, D2-260 and D2-262 CPUs (see ﬁrmware requirements).

• Analog 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 channels can be updated in one scan (D2240, D2-250-1, D2-260 and D2-262 only).

• Outputs are both current sinking and sourcing.

Firmware Requirements:

• To use this module, D2-230 CPUs must have ﬁrmware version 2.7 or later.

• To use the pointer method for writing values, D2-240 CPUs require ﬁrmware version 3.0 or later.

• D2-250-1 CPU requires ﬁrmware version 1.33 or later.

OUT

F2-08DA-1

18-26.4VDC 80mA 4-20mA SNK-SRC

1-I

1-O

2-I

2-O

3-I

3-O

4-I

4-O

5-I

5-O

6-I

6-O

7-I

7-O

8-I

8-O

N/C

24V

F2-08DA-1

ANALOG

8 CHANNEL

10-2

Analog Output Conﬁguration Requirements

The F2-08DA-1 analog output module requires 16 discrete output points. The module can be installed in any slot of a DL205 PLC system, but the available power budget and discrete I/O points can be the limiting factors. Check the user manual for the particular model of CPU and I/O base being used for information regarding power budget and number of local, local expansion or remote I/O points.

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

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

The following tables provide the speciﬁcations for the F2–08DA–1 Analog Output Module. Review these speciﬁcations to make sure the module meets your application requirements.

Output Specifications

Number of Channels Output Range Resolution Output Type Maximum Loop Supply Source Load Sink Load Total Load (sink plus source) Linearity Error (end to end) Conversion Settling Time

Full-scale Calibration Error

Offset Calibration Error

Maximum Full Scale Inaccuracy @ 0–60°C

Maximum Full Scale Inaccuracy @ 0–25°C (includes all errors & temperature drift)

8, single-ended 4–20 mA 12 bit (1 in 4096) Current sinking and current sourcing 30VDC 0–400 q (for loop power 18–30 V) 0–600 q / 18V, 900q / 24V, 1200q / 30V 600q / 18V, 900q / 24V, 1200q / 30V ±2 counts (±0.050% of full scale) maximum 400µs maximum (full scale change) ±12 counts maximum, sinking (any load)

±12 counts maximum, sourcing (125q load) ±18 counts maximum, sourcing (250q load) ±26 counts maximum, sourcing (400q load)

±9 counts maximum, sinking (any load) ±9 counts maximum, sourcing (125q load) ±11 counts maximum, sourcing (250q load) ±13 counts maximum, sourcing (400q load)

0.5% sinking (any load) & sourcing (125q load )

0.64% sourcing (250q load )

0.83% sourcing (400q load)

0.3% sinking (any load) & sourcing (125q load )

0.44% sourcing (250q load )

0.63% sourcing (400q load)

PLC Update Rate Digital Outputs /

Output Points Required Power Budget Requirement External Power Supply Operating Temperature Storage Temperature Relative Humidity Environmental air Vibration Shock Noise Immunity

General Specifications

8 channel per scan maximum 12 binary data bits, 3 channel ID bits, 1 output enable bit

16 (Y) output points required 30mA @ 5VDC (supplied by the base) 18–30 VDC, 50mA plus 20mA / output loop, class 2 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

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10-3

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

F2-08DA-1

Correct!

Incorrect

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. As can be seen in the section on Writing the Control Program, V-memory locations are used to hold the analog data that will be written to the output. If the module is placed in a slot so that 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.

Slot 0Slot 1Slot2 Slot 3Slot 4

16pt

8pt

Input

Output

X20

X27

Y17

X17

16pt

8pt16pt

Output Output

Y20

Y40

Y37

Y47

Data can be written correctly because the output points start on a V-memory boundary address as seen in the table below.

Slot 0Slot 1Slot2 Slot 3Slot 4

X17

16pt

Input

V40500V40502

Y 3 7

8pt

Input

Output

X20

X27

Y17

V40501

F2-08DA-1

8pt

Output Output

Y20

Y27

16pt16pt

Y30

Y47

BSLBSM

Y 2 0

Data is split over two locations, so instructions cannot access data from a D2-230 (or when the module is placed in a remote base).

V40502

Y 5 7

BSLBSM

Y 4 0

Y 3 7

V40501

BSLBSM

Y 2 0

To use the V-memory references required for the multiplexing method, the ﬁrst output address assigned to the module must be one of the following Y locations. The table also shows the V-memory addresses that correspond to these Y locations.

10-4

Y0 Y20 Y40 Y60 Y100 Y120 Y140 Y160

V40500 V40501 V40502 V40503 V40504 V40505 V40506 V40507

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

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Connecting and Disconnecting 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.

User Power Supply Requirements

The F2-08DA-1 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 F2-08DA-1 module requires 18–30 VDC (at 50mA) and each current loop requires 18–30 VDC (at 20mA), from the external power supply.

The DL205 AC bases have a built-in 24VDC power supply that provides 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 required operating current and the transmitter negative (-) side and the module power supply negative (-) side are connected together.

WARNING: If the internal 24VDC power budget is exceeded, it may 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

10-5

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Wiring Diagram

The F2-08DA-1 module has a removable connector which helps to simplify wiring. Just squeeze the top and bottom retaining clips and gently pull the connector from the module. Use the following diagram to connect the field wiring. Channels 1 and 2 are shown wired for sourcing, and channels 7 and 8 are shown wired for sinking. The diagram also shows how to wire an optional loop power supply.

Typical User Wiring

1–I

2–I

3–I

4–I

5–I

6–I

7–I

8–I

N/C

24V

Internal Module Wiring

SOURCE Configurations

Ch 1 load 250 ohms typical

Ch 2 load 250 ohms typical

SINK Configurations

Ch 7 load 250 ohms typical

Ch 8 load 250 ohms typical

See NOTE 1

Loop Power

Supply

18-30 VDC

–

1–O

2–O

3–O

4–O

5–O

6–O

7–O

8–O

–

Sink/Source Circuitry

OUT

F2-08DA-1

18-26.4VDC 80mA 4-20mA SNK-SRC

1-I

1-O

2-I

2-O

3-I

3-O

4-I

4-O

5-I

5-O

6-I

6-O

7-I

7-O

8-I

8-O

N/C

24V

ANALOG

8 CHANNEL

10-6

NOTE 1: Shields should be connected to the 0V terminal of the module.

Load Range

The maximum load resistance depends on the particular loop power supply being used.

Loop Power Supply Voltage Source Load Range Sink Load Range

30VDC 24VDC 18VDC

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

0–400 q

0–1200 q

0–900 q 0–600 q

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

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.

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

The D2-230 can send one channel of data to the output per CPU scan if the multiplexing method is used. The module refreshes all field devices on each scan, but new data can only be obtained from the CPU at the rate of one channel per scan. Since there are eight channels, it can take eight scans to update all channels. However, if only one channel is being used, then that channel will be updated on every scan. The multiplexing method can also be used for the D2-240, D2-250-1, D2-260 and D2-262 CPUs.

Scan

Read inputs

System Using

Multiplex

Method

(D2-230)

ExecuteApplicationProgram

Calculatethe data

Writedata

Writeto outputs

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

Scan N

Scan N+1

Scan N+2

Scan N+3

. . .

Scan N+8

Channel 1

Channel 2

Channel 3

Channel 4

. . .

Channel 8

10-7

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Channel Scanning 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, all channels can be updated on every scan. This is because the all three 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.

Scan

Read inputs

System With D2-240, D2-250-- 1 D2-260 or D2-262 CPU Using Pointer Method

Scan N

Channel1,2...8

ExecuteApplicationProgram

Calculatethe data

Writedata

Scan N+1

Scan N+2

Scan N+3

Scan N+4

Channel1,2...8

Channel 1, 2...8

Channel1,2...8

Writeto outputs

Understanding the Output Assignments

Remember that the F2-08DA-1 module appears to the CPU as a 16-point discrete output module. These points provide the data value and an indication of which channel to update. Note, if either a D2-240, D2-250-1, D2-260 or a 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 output points are automatically mapped into V-memory, the location of the data word that will be assigned to the module can be simply determined.

10-8

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

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

V40501

F2-08DA--1

Slot 0Slot1 Slot 2Slot3 Slot 4

16pt

Input

X17

8pt

Input

Output

X20

-X27

-Y17

16pt

Output Output

Y20

Y37

8pt16pt

Y40

Y47

V40500V40502

V40501

BSLBSM

Data Bits

Y 2 0

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

Channel Select Outputs

Three of the outputs select the active channel. Remember, the V-memory bits are mapped directly to discrete outputs. The binary weight of the three bits will determine the selected bit. By controlling these outputs, the channel to be updated can be selected.

Select Channel Outputs

Y36 Y35 Y34

– – – 1 – – X 2 – X – 3 – X X 4 X – – 5 X – X 6 X X – 7 X X X 8

=channel select outputs

Channel Number

Selected

BSLBSM

Y 2 0

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10-9

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Analog Data Bits

The ﬁrst twelve bits represent the analog data i n 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

Output Enable

The last output can be used to update outputs. If this output is OFF, the outputs will be cleared.

V40501

BSLBSM

01110987654321

= databits

V40501

BSLBSM

Y 3 7

= output enable

Module Resolution

Since the module has 12-bit resolution, the analog signal is converted into 4096 counts ranging from 0–4095 (212). For example, send a 0 to get a 4mA signal, and 4095 to get a 20mA signal. 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.

20mA

4mA

4--20mA

0 4095

Resolution =

H=high limitofthe signalrange

L=low limit of thesignalrange

16mA/4095 = 3.9 µA per count

H − L

4095

Y 2 0

10-10

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

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

SP1

Writing the Control Program

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 have to be made to the formula depending on the scale of the engineering units.

For 0–4095 output format

4095

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

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.

A = 10U 10 (H–L) (1000–0)

4095

A = 494

4095

A = 2023

The Conversion Program

The example program shows how to write the program to perform the engineering unit conversion. This example assumes that a BCD value has been stored in V2300 and V2301 for channels 1 and 2 respectively.

NOTE: The DL205 has many instructions available so that math operations can simply be performed using BCD format. Do the math in BCD, then convert to binary before writing to the module output.

SP1

LD V2300

MUL K4095

DIV K1000

OUT V2000

LD V2301

MUL K4095

DIV K1000

OUT V2001

TheLDinstruction loads the engineering unitsusedwithchannel 1 into theaccumulator.This exampleassumesthe numbers areBCD.Since SP1 is used, this rung automatically exec utes on every scan. Yo ucould alsouse an X, C, etc. permissive contact.

Multiply theaccumulatorby 4095 (tostart theconversion).

Divide theaccumulator by 1000 (becauseweusedamultiplierof 10, we have to use1000 instead of 100).

Storethe BCDresult in V2000 (the actual stepsrequiredtosendthe data areshownlater).

TheLDinstruction loads the engineering unitsusedwithchannel 2 into theaccumulator.This exampleassumesthe numbers areBCD.Since SP1 is used, this rung automatically exec utes 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 V2001 (the actual stepsrequiredtosendthe data areshownlater).

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

10-11

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

SP0

math

Writing Values: Pointer Method and Multiplexing

Pointer Method for the D2-240, D2-250-1, D2-260 and D2-262 CPUs

There are two methods of reading values:

• Pointer method

• Multiplexing

The multiplexing method must be used with a D2-230 CPU. The multiplexing method must also be used with remote I/O modules (the pointer method will not work). Either method can be used with the D2-240, D2-250-1, D2-260 and D2-262 CPUs, but for ease of programming it is highly recommended to use the pointer method.

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

These V-memory locations allow you to:

• Specify the data format

• Specify the number of channels to scan

• Specify the location of the data that will be written to the module

NOTE: D2-240 CPUs with ﬁrmware release version 1.5 or later and. D2-250-1 CPUs with ﬁrmware release version 1.06 or later support this method.

The following example program 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. V2000 is used in the example but any user V-memory location can be used. In this example the module is installed in slot 3. Be sure to use the V-memory locations for the module placement. The pointer method automatically converts values to BCD.

10-12

2K82

OUT V7663

LDA O2000

OUT V7703

-or-

Theoctal address(O2000)isstoredhere. V7703isassignedtoslot 3 and acts as a pointer,whichmeans theCPU will usethe octal value in this location to determine exactlywheretostore the output data.

Loadsaconstant that specifies the numberofchannelstoscan and thedataformat.The lowerbyte, most significantnibble (MSN) selects the dataformat(i.e. 0=BCD, 8=Binary), theLSN selects the numberofchannels(1or2).

Thebinaryformatisusedfor displayingdataonsomeoperator interfaces.The D2-230 and D2-240 CPUs do notsupport binary functions, whereasthe D2-250-1, D2-260, and D2-262 do.

Special V-memory location assignedtoslot3that contains the numberofchannelsto scan.

This loads an octalvalue forthe firstV-memorylocationthat will be used to storethe output data. Forexample,the O2000 entered here would designatethe following addresses. Ch1--V2000, Ch2--V2001

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

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

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 Output Module Slot-Dependent V-memory Locations

Slot No. of Channels Storage Pointer

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

Expansion Base D2-CM #1: Analog Output Module Slot-Dependent V-memory Locations

Slot No. of Channels Storage Pointer

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

Expansion Base D2-CM #2: Analog Output Module Slot-Dependent V-memory Locations

Slot No. of Channels Storage Pointer

0 1 2 3 4 5 6 7 V7660 V7661 V7662 V7663 V7664 V7665 V7666 V7667 V7700 V7701 V7702 V7703 V7704 V7705 V7706 V7707

0 1 2 3 4 5 6 7 V36000 V36001 V36002 V36003 V36004 V36005 V36006 V36007 V36020 V36021 V36022 V36023 V36024 V36025 V36026 V36027

0 1 2 3 4 5 6 7 V36100 V36101 V36102 V36103 V36104 V36105 V36106 V36107 V36120 V36121 V36122 V36123 V36124 V36125 V36126 V36127

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

Expansion Base D2-CM #3: Analog Output Module Slot-Dependent V-memory Locations

Slot No. of Channels Storage Pointer

0 1 2 3 4 5 6 7 V36200 V36201 V36202 V36203 V36204 V36205 V36206 V36207 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 Output Module Slot-Dependent V-memory Locations

Slot No. of Channels Storage Pointer

0 1 2 3 4 5 6 7 V36300 V36301 V36302 V36303 V36304 V36305 V36306 V36307 V36320 V36321 V36322 V36323 V36324 V36325 V36326 V36327

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Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Continued

Writing Data (Multiplexing Example)

The following example program shows how to write data using the multiplexing method. This may be used with all the DL205 CPUs.

C10

LD V2007

BIN

ORD

K7000

LD V2006

BIN

ORD

K6000

LD V2005

BIN

OUT

C10

OUT

Restarts the updatesequenc e.

Updates channel 8.

Updateschannel7.

Updateschannel6.

10-14

ORD

K5000

OUT

LD V2004

BIN

ORD

K4000

OUT

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

Updateschannel5.

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Write Data (Multiplexing Example) Continued

SP0

LD V2003

BIN

ORD

K3000

LD V2002

BIN

ORD

K2000

LD V2001

BIN

ORD

K1000

LD V2000

BIN

OUT

Updates channel 4.

Updates channel 3.

Updates channel 2.

Updates channel 1.

SP1

ORD

OUT

OUT V40501

Y37

OUT

Sends thedatatothe module.Our example starts with V40501, but the actual value dependsonthe location of themoduleinyour application.

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10-15

Chapter 10: F2-08DA-1, 8-Channel Analog Current Output

Write Data to One Channel

If more than one channel is used, or if updates are to be controlled separately, the following program can be used.

SP1

LD V2000

BIN

ANDD K0FFF

OUT V40501

Y34

RST

Y35

RST

Y36

RST

Y37

OUT

TheLD instruction loadsthe data intothe accumulator.Since SP1 is used, this rung automatically executes on every scan. Yo ucould alsouse an X, C, etc. permissive 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 channelselection.

TheOUT instruction sends the datatothe module.Ou examplestartswithV40501,but theactualvalue dependsonthe location of themodule in your application.

Y34, Y35, Y36--OFF selectschannel 1for updating.

Y37isthe output enablebit.

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 or troubleshooting. The following table shows some formulas help with the conversions.

Range If the digital value is known

16D

A =

4–20 mA

+ 4

4095

If the analog signal level is

known.

4095

D =

(A 4)

10-16

For example, to covert a 10mA signal level to a digital value, substitute 10 for A and complete the math as shown in the example to the right.

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

4095

D =

(A – 4)

4095

D =

(10mA – 4)

D = (255.93) (6)

D = 1536

Analog F2–08DA–1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Connecting and Disconnecting the Field Wiring

Module Operation

Writing the Control Program