Analog F2-08AD-2 User Manual

F2-08AD-2 8-ChAnnel AnAlog VoltAge Input

In This Chapter...

Module Speciﬁcations ............................................................................................... 5-2

Setting the Module Jumpers ..................................................................................... 5-5

Connecting the Field Wiring ..................................................................................... 5-7

Module Operation ..................................................................................................... 5-9

Writing the Control Program .................................................................................. 5-14

Chapter

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

CH8

CH3

CH5

F2-08

10-30VDC

5mA

Module Speciﬁcations

NOTE: A re-designed F2-08AD-2 with a single circuit board design was released in 2009. The jumper link location is different. See Setting the Module Jumpers on pages 5-5 and 5-6. Also, some speciﬁcations were changed on page 5-3. Otherwise, the re-designed module functions the same as the prior design.

The F2-08AD-2 Analog Voltage Input module provides several hardware features:

• Analog inputs 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.

• With a D2-240, D2-250-1, D2-260 or D2-262 CPU, all channels can be updated in one scan.

Firmware Requirements:

To use this module, D2-230 CPUs must have ﬁrmware version

1.6 or later. To use the pointer method of writing values, D2-240 CPUs require ﬁrmware version 2.2 or later. All versions of the D2-250-1 and D2-260 CPU’s ﬁrmware support this module and the pointer method.

Analog Input Conﬁguration Requirements

The F2-08AD-2 Analog Input requires 16 discrete input points. The module can be installed in any slot of a DL205 system. The available power budget and discrete I/O points are the limiting factors. Check the user manual for the CPU model and I/O base being used for more information regarding power budget and number of local, local expansion or remote I/O points.

IN ANALOG

F2-08AD-2

10-30VDC

5mA

+24V

+24

H1+

CH1+

H2+

CH2+

CH3+

CH4+

H4+

CH5+

CH6+

H6+

H7+

CH7+

CH8+

ANALOG IN

NALOG IN

-5.010VD

0-5.0 - 10VDC

-5, +/-10VD

+/-5, +/-10VDC

AD-

NAL

8CH

F2-08AD-2

5-2

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

The following tables provide the speciﬁcations for the F2–08AD–2 Analog Input Module. Review these speciﬁcations to make sure the module meets your application requirements.

Input Specifications

Number of Channels Input Ranges

Resolution

Step Response Crosstalk Active Low-pass Filtering Input Impedance Maximum Continuous Overload

Linearity Error (End to End)

Input Stability Full Scale Calibration Error

(Offset error not included) Offset Calibration Error

Maximum Inaccuracy

Accuracy vs. Temperature

8, single ended (one common) 0–5 V, 0–10 V, ±5V, ±10V 12 bit (1 in 4096) unipolar (0 – 4095)

13 bit (1 in 8192) bipolar (– 4095 – +4095)

1.0 ms (* 4 ms) – 95% of full step change –70dB, 1 count maximum –3 dB @ 200Hz (– 6dB per octave) Greater than 20Mq ±75VDC ±0.025% of span (±1 count maximum unipolar)

(±2 count maximum bipolar) ±1 count

±3 counts maximum

±1 count maximum, @ 0VDC ±0.1% @ 25°C

±0.3% 0–60°C (32–140°F) ±50ppm/°C maximum full scale calibration (Including maximum offset change of 2 counts)

General Specifications

PLC Update Rate

Data Acquisition Time

Digital Inputs Input points required

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

NOTE: Values in parenthesis with an asterisk are for older modules with two circuit board design and date codes 0609D4 and prior. Values not in parenthesis are for single circuit board models with date code 0709E1 and above.

1 channel per scan maximum (D2-230 CPU) 8 channels per scan maximum

(D2-240, D2-250 – 1, D2-260 or D2-262 CPU) 3ms / channel (asynchronous)

12 binary data bits, 1 sign bit 3 channel ID bits, 1 diagnostic bit 16 point (X) input module

100mA (* 60mA) maximum, 5VDC (supplied by base) 5mA, 10–30 VDC (*80mA, 18-26.4 VDC) 0°C–60°C (32°F to 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

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

5-3

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

F2-08AD-2

Correct!

Incorrect

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

Even though the module can be placed in any slot, it is important to examine the conﬁguration if a D2-230 CPU is used, as can be seen in the section about Writing the Program, located in this chapter. V-memory locations are used to extract the analog data. If the module is placed so the input points do not start on a V-memory boundary, the instructions cannot access the data. This also applies when placing this module in a remote base using a D2-RSSS in the CPU slot.

Slot 0Slot 1Slot2 Slot 3Slot 4

8pt

Input

X10

X17

Input

X20

X37

16pt

16pt16pt

InputOutput

X40

X57

Y17

V40400 V40402

Data is correctly entered so input

V40401

BSLBSM

points start on a V-memory boundary.

X 3

F2-08AD-2

Slot 0Slot 1Slot2 Slot 3Slot 4

8pt

Input

16pt

Input

X10

X27

Input

X30

X47

16pt

InputOutput

X50

X67

16pt16pt

Y17

X 2

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

V40401

X 3

To use the V-memory references required for a D2-230 CPU, the ﬁrst input address assigned

X 2

BSLBSM

V40400

X7X

BSLBSM

X 0

to the module must be one of the following X locations. The table also shows the V-memory addresses that correspond to these X locations.

X V

X0 X20 X40 X60 X100 X120 X140 X160

V40400 V40401 V40402 V40403 V40404 V40405 V40406 V40407

5-4

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

+1 +2

Setting the Module Jumpers

Selecting the Number of Channels

There are two jumpers, labeled +1, +2, and +4 that are used to select the number of channels that will be used. Use the ﬁgures below to locate the jumpers on the module. The module is set from the factory for eight channel operation (all jumpers installed).

Unused channels are not processed. For example, if only channels 1 through 3 are selected, then channels 4 through 8 will not be active. The following table shows how to place the jumpers to select the number of channels.

No. of Channels +1 +2 +4

1 No No No 1, 2 Yes No No 1, 2, 3 No Yes No 1, 2, 3, 4 Yes Yes No 1, 2, 3, 4, 5 No No Yes 1, 2, 3, 4, 5, 6 Yes No Yes 1, 2, 3, 4, 5, 6, 7 No Yes Yes 1, 2, 3, 4, 5, 6, 7, 8 Yes Yes Yes

Jumper location on modules having Date Code 0609D4 and previous (two circuit board design)

For example, to select all 8 channel operation, leave all jumpers installed. To select 1 channel, remove all three jumpers. Note that removed jumpers can be stored on a single post to prevent from losing them.

Yes = jumper installed No = jumper removed

Jumper location on modules having Date Code 0709E1 and above (single circuit board design)

Use jumpers +1, +2 and +4 to select number of channels.

These jumpers are located on the motherboard, the one with the black D-shell style backplane connector.

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

5-5

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Jumper

Selecting the Input Voltage

There is another jumper, labeled J3 that is used to select between the 5V ranges and the 10V ranges See the figures below to locate the jumper on the module being used. The module comes from the factory set for 10V operation (jumper is removed and is stored on one of the pins).

NOTE: Install jumper J3 for 0–5 V or W5V operation. Remove J3, or store on a single pin, for 0 to 10V or W10V operation.

Jumper J3 location on modules having Date Code 0609D4 and previous (two circuit board design)

Jumper J3 is located on the smaller circuit board, which is on top of the motherboard.

Install J3 for 0–5 V or W5V operation. Remove J3, or store on a single pin, for 0–10V or W10V operation.

Jumper J3 location on modules having Date Code 0709E1 and above (single circuit board design)

Install J3 for 0–5 V or W5V operation. Remove J3, or store on a single pin, for 0–10V or W10V operation.

5-6

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Connecting the Field Wiring

Wiring Guidelines

Your company may have guidelines for wiring and cable installation. If so, check them before starting 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 F2-08AD-2 module requires at least one field-side power supply. The same or separate power sources can be used for the module supply and the voltage transmitter supply. The module requires 10–30 VDC, at 5mA, 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 voltage and current requirements, and that the transmitter and the module supply minus (-) side are connected together.

WARNING: If the 24VDC base power supply 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 damage to equipment.

The DL205 base has a switching type power supply. As a result of switching noise, W3–5 counts of instability may be noticed in the analog input data if this power supply is used. If this is unacceptable, try using one of the following.

1. Use a separate linear power supply.

2. Connect the 24VDC common to the frame ground, which is the screw

terminal marked on the screw terminal marked “G” on the base.

By using these methods, the input stability is rated at W1 count.

Unused inputs should be shorted together and connected to common.

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

5-7

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Wiring Diagram

The F2-08AD-2 module has a removable connector to simplify wiring the module. 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

24 VDC

0 VDC

0 V

CH1

3-wire

Voltage

Transmitter

CH 2

2-wire

Voltage

Transmitter

CH 3

4-wire

Voltage

Transmitter

CH 4

3-wire

Voltage

Transmitter

See NOTE 1

+ +

24VDC

CH1

CH2

CH3

CH4

CH5

CH6

CH7

CH8

Retaining clip

Analog Multiplexer

AD C

IN ANALOG

F2-08AD-2

10-30VDC

5mA

+24V

CH1+

CH2+

CH3+

CH4+

CH5+

CH6+

CH7+

CH8+

ANALOG IN 0-5.0 - 10VDC +/-5, +/-10VDC

8CH

5-8

Retaining clip

NOTE: Connect unused channels (CH5+, CH6+, CH7+, CH8+ in this diagram) to common (0VDC).

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Module Operation

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

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

Depending on the type of CPU being used, the F2-08AD-2 module can supply different amounts of data per scan. The D2-230 can obtain one channel of data per CPU scan. Since there are eight channels, it can take up to eight scans to get data for all channels. Once all channels have been scanned the process starts over with channel 1. Unused channels are not processed, so if only two channels are selected, each channel will be updated every other scan. The multiplexing method can also be used for the D2-240, D2-250-1, D2-260 and D2-262 CPUs.

Scan

ReadInputs

Execute ApplicationProgram

Read the data

Store data

WritetoOutputs

Scan N

Scan N+1

(repeat forch. 3--6)

Scan N+6

Scan N+7

Scan N+8

System With

DL230CPU

Channel1

Channel2

Channel7

Channel8

Channel1

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

5-9

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Channel Scanning Sequence (Pointer method) for D2-240, D2-250-1, D2-260 or D2-262 CPUs

If either a D2-240, a D2-250-1, a D2-260 or a D2-262 CPU are used, all eight channels of input data can be collected in one scan. This is because the D2-240, D2-250-, D2-260 and D2-262 CPUs support special V-memory locations that are used to manage the data transfer which is discussed in more detail in the section on Writing the Control Program later in this chapter.

Scan

ReadInputs

Execute ApplicationProgram

Read the data

Store data

WritetoOutputs

Scan N

Scan N+1

Scan N+2

Scan N+3

Scan N+4

System With DL240, D2-250--1, D2-260 or D2-262

CPU

Ch 1, 2, 3, ...8

Analog Module Updates

Even though the channel updates to the CPU are synchronous with the CPU scan, the module asynchronously monitors the analog transmitter signal and converts the signal to a 12-bit binary representation. This enables the module to continuously provide accurate measurements without slowing down the discrete control logic in the RLL program.

For the vast majority of applications, the values are updated much faster than the signal changes. However, in some applications, the update time can be important. The module takes approximately one millisecond to sense 95% of the change in the analog signal.

5-10

NOTE: This is not the amount of time required to convert the signal to a digital representation. The conversion to the digital representation takes only a few microseconds. Many manufacturers list the conversion time, but it is the settling time of the ﬁlter that really determines the update time.

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

F2-08AD-2

Understanding the Input Assignments

It was mentioned earlier in this chapter that the F2-08AD-2 module appears as a 16-point discrete input module to the CPU. These points can be used to obtain:

• An indication of which channel is active

• The digital representation of the analog signal

• Module diagnostic information

Since all input points are automatically mapped into V-memory, it is very easy to determine the location of the data word that will be assigned to the module.

Slot 0Slot1 Slot 2Slot3 Slot 4

8pt

Input

8pt

Input

X10

-X17

Input

X20

X37

16pt InputOutput

X40

X57

16pt16pt

Y17

V40400 V40402

V40401

Data Bits

V40500

BSLBSM

X 2

Within these word locations, the individual bits represent speciﬁc information about the analog signal.

Analog Data Bits

The ﬁrst twelve bits represent the analog data in binary format.

Bit Value Bit Value

0 1 6 64 1 2 7 128

1 5

2 4 8 256 3 8 9 512 4 16 10 1024 5 32 11 2048

V40401

= databits

BSLBSM

01413121110987654321

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

5-11

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

V40401

Active Channel Indicator Inputs

Three of the inputs are binary-encoded to indicate the active channel (remember, the V-memory bits are mapped directly to discrete inputs). The inputs automatically turn on and off to indicate the current channel for each scan.

Scan X34 X35 X36 Channel

N Off Off Off 1 N+1 On Off Off 2 N+2 Off On Off 3 N+3 On On Off 4 N+4 Off Off On 5 N+5 On Off On 6 N+6 Off On On 7 N+7 On On On 8

Module Diagnostic and Sign

The MSB input bit is the broken transmitter/ no 24V indicator and the sign indicator.

If the bit is on and the data is zero, there is no 24V input power or the terminal block is loose or missing. If the data is not 0 (zero), the input represents the sign bit.

V40401

=channel inputs

X 3 7

=diagnosticinput/signbit

BSLBSM

X 2 0

BSLBSM

X 2 0

5-12

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Module Resolution

Since the module has 12-bit unipolar resolution, the analog signal is converted into 4096 counts ranging from 0–4095 (212). For example, with a 0–10V scale, a 0V signal would be 0, and a 10V signal would be 4095. This is equivalent to a binary value of 0000 0000 0000 to 1111 1111 1111, or 000 to FFF hexadecimal. The diagram shows how this relates to each signal range. The bipolar ranges utilize a sign bit to provide 13-bit resolution. A value of 4095 can represent the upper limit of either side of the range. Use the sign bit to determine negative values.

Unipolar

Ranges

0 4095

Unipolar Resolution

Bipolar Resolution

HorL=highorlow limit of therange

-- V

Bipolar

Ranges

H–L

4095

H–L

8191

0 4095-- 4095

Voltage Range

0V to +10V

-10V to +10V 0V to + 5V

-5V to + 5V

Signal Span

(H – L)

10V 4095 2.44 mV

20V 8191 2.44 mV

5V 4095 1.22 mV 10V 8191 1.22 mV

Divide By

Smallest Detectable

Change

Each count can also be expressed in terms of the signal level by using the equation shown on the facing page. The following table shows the smallest detectable signal change that will result in one LSB change in the data value for each input signal range.

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

5-13

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

incoming data.

Writing the Control Program

Reading Values: Pointer Method and Multiplexing

There are two methods of reading values:

1. The pointer method

2. Multiplexing

The multiplexing method must be used when using 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 strongly recommended to use the pointer method.

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

The DL205 series has 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 storage locations

NOTE: D2-240 CPUs with ﬁrmware release version 2.2 or later support this method. D2-250 CPUs with ﬁrmware release version 1.06 or later support this method. If the D2-230 example needs to be used, module placement in the base is very important. Review the section earlier in this chapter for guidelines.

5-14

The 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. This is all that is required to read the data into V-memory locations. Once the data is in V-memory, math can be used on the data, compare the data against preset values, and so forth. V2000 is used in the example but any user V-memory location can be used. In this example the module is installed in slot 2. Be sure to use the V-memory locations for the module placement. The pointer method automatically converts values to BCD (depending on the LD statement in the ladder logic).

SP0

08 K0088

OUT V7662

LDA O2000

OUT V7672

-or-

Loadsaconstant that specifies the numberofchannelstoscan and thedataformat.The upperbyte, most significant nibble (MSN) selects the dataformat(i.e. 0=BCD, 8=Binary), theLSN selects the numberofchannels(i.e. 1, 2, 3, 4, 5, 6, 7, or 8).

Thebinaryformatisusedfor displayingdat aonsomeoperator interfaces.The DL230/240 CPUs do notsupport binarymath functions, whereasthe DL250 does.

Special V-memory location assignedtoslot2that contains the numberofchannelsto scan.

This loads an octalvalue forthe firstV-memorylocationthat will be used to storethe incoming data. Forexample, theO2000enter ed herewoulddesignate thefollowing addresses. Ch1--V2000, Ch2--V2001, Ch3--V2002,Ch4 -- V2003 Ch5-V2004, Ch6-V2005, Ch7-V2006,Ch8 -V2007

Theoctal address(O2000)isstoredhere. V7672isassignedtoslot 2 and acts as a pointer,whichmeans theCPU will usethe octal value in this location to determine exactlywhere to storethe

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

The tables below show the special V-memory locations used by the D2-240, D2-250-1, D2-260 and D2-262 CPUs for the base and local expansion base I/O slots. Slot 0 (zero) is the module next to the CPU or D2-CM module. Slot 1 is the module two places from the CPU or D2-CM, and so on. Remember, the CPU only examines the pointer values at these locations after a mode transition. Also, if you use the D2-230 (multiplexing) method, 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 Input 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 Input 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 Input 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 V7670 V7671 V7672 V7673 V7674 V7675 V7676 V7677

0 1 2 3 4 5 6 7 V36000 V36001 V36002 V36003 V36004 V36005 V36006 V36007 V36010 V36011 V36012 V36013 V36014 V36015 V36016 V36017

0 1 2 3 4 5 6 7 V36100 V36101 V36102 V36103 V36105 V36106 V36107 V36110 V36111 V36112 V36113 V36114 V36115 V36116 V36117

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

Expansion Base D2-CM #3: Analog Input 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 V36210 V36211 V36212 V36213 V36214 V36215 V36216 V36217

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

Expansion Base D2-CM #4: Analog Input 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 V36310 V36311 V36312 V36313 V36314 V36315 V36316 V36317

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

5-15

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Check Channel1

Using Bipolar Ranges (Pointer Method) for D2-240, D2-250-1, D2-260 and D2-262 CPUs

Some additional logic is needed with bipolar ranges to determine whether the value being returned represents a positive voltage or a negative voltage. For example, the direction of a motor may be needed to be known. With the D2-240 or D2-250 CPU, the last input cannot be used to show the sign for each channel (X37 in the previous examples). This is because the D2-240, D2-250-1, D2-260 and D2-262 reads all eight channels in one scan. Therefore, if X37 were used, the last channel read would just be monitored and the sign would not be able to be determined for the previous channels. A simple solution is if the value read is greater than or equal to 8001, the value is negative.

The sign bit is the most signiﬁcant bit, which combines 8000 with the data value. If the value is greater than or equal to 8001, only the most signiﬁcant bit and the active channel bits will need to be masked to determine the actual data value.

The following program shows how to accomplish this. Since a negative value is always meant to be known, these rungs should be placed before any other operations that use the data, such as math instructions, scaling operations, and so forth. Also, if stage programming instructions are being used, place these rungs in a stage that is always active. Please note, this logic is only needed for each channel that is using bipolar input signals. The following example only shows two channels.

5-16

SP1

V2000 K8001

Check Channel2

SP1

V2001 K8001

LD V2000

ANDD K7FFF

OUT V2020

LD V2001

ANDD K7FFF

OUT V2021

Load channel 1datafromV-memoryintothe accumulator. Remember,the data canbe negative. Contact SP1 is always on.

This instruction masks thesignbit of theBCD dataifit is set. Withoutthis step, negative values will not be correct,sodo not forget to include it.

Putthe actual signal value in V2020. Nowyou canuse thedatanormally.

Channel 1datais negativewhenC1ison(avalue of -- 1

OUT

reads as 8001,--2 is 8002, etc.).

Load channel 2fromV-memoryintothe accumulator. Remember, the datacan be negative.Contact SP1 is always on.

This instruction masks thesignbit of theBCD data, if it is set. Withoutthis step, negative values will not be correct,sodo not forget to include it.

Putthe actual signal value in V2021. Nowyou canuse thedatanormally.

Channel 2datais negativewhenC2ison(avalue of -- 1

OUT

reads as 8001,--2 is 8002, etc.).

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Reading Values (Multiplexing) for D2-230, D2-240, D2-250-1, D2-260 and D2-262 CPUs

The D2-230 CPU does not have the special V-memory locations which will allow data transfer to be automatically enabled. 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, it is very easy to use the active channel status bits to determine which channel is being monitored.

NOTE: This example is for a module installed as shown in the previous examples. The addresses used would be different if the module is installed in a different I/O arrangement. The rungs can be placed anywhere in the program, or if stage programming is being used, place them in a stage that is always active.

SP1

StoreChannel 1

X34 X35 X36

StoreChannel2

X34 X35 X36

(repeatfor channels 3--6)

StoreChannel 7

X34 X35 X36

StoreChannel 8

X34 X35 X36

LD V40401

ANDD KFFF

BCD

OUT V2000

OUT V2001

OUT V2006

OUT V2007

Loadsthe complete datawordintothe accumulator. TheV-memorylocation depends on theI/O configuration. SeeAppendixAforthe memory map.

This instruction masks thechannel identification bits. Without this,the values used will not be correct so do notforget to include it.

It is usually easier to perform math operationsin BCD, so it is besttoconvert thedatatoBCD immediately. Youcan leave out this instructionif your application does not require it.

When X34, X35 and X36are off, channel1data is stored in V2000.

When X34ison, X35and X36are off, and broken transmitterdetectisoff,channel2data is stored in V2001.

When X35 and X36are on and X34isoff, channel7dataisstoredinV2006.

When X34, X35 and X36are on, channel8data is stored in V2007.

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

5-17

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

StoreChannel 1

LoadData

2’svalue is negative.

Single Channel Selected

The single channel program makes it easy to determine which channel has been selected.

X36 X34 X35

Using Bipolar Ranges (Multiplexing)

The following program shows how to accomplish this. Since a negative value is always needed to be known, these rungs should be placed before any other operations that use the data, such as math instructions, scaling operations, and so forth. Also, if stage programming instructions are being used, place these rungs in a stage that is always active. Please note, this logic is only needed for each channel that is using bipolar input signals. The following example only shows two channels but the rungs can be repeated for all eight channels if needed.

SP1

StoreChannel 1

StoreChannel 2

LD V40401

ANDD KFFF

BCD

OUT V2000

LD V40401

ANDD KFFF

BCD

X36X34 X35

X37

OUT V2000

OUT V2001

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

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

It is usually easier to perform math operationsinBCD. So it is besttoconvertthe datatoBCD immediately. Youcan leave out this instruction if your application does notrequire it.

When themoduleis not busy, andX34 andX35 are off, channel1dataisstoredinV2000.

Loadsthe complete datawordintothe accumulator. TheV-memorylocation depends on the I/O configuration. SeeAppendixAforthe memory map.

This instructionmasks thechannel identification bits. Without this ,the values used will not be correct,sodo not forget to include it.

It is usually easier to perform math operationsin BCD, so it is besttoconvert thedat atoBCD immediately. Youcan leave out this instructionif your application does not require it.

When themoduleisnot busy, andX34, X35 and X36are off, channel1dataisstoredinV2000.C0 is resettoindic atechannel1’s value is positive.

RST

If X37is on, then thedatavalue representsa

SET

negative voltage.C0isset to indicate channel 1’svalue is negative.

When themoduleisnot busy, andX34 is on and X35 and X36are off, channel 2dataisstoredin V2001.C1isreset to indicate channel2’s value

is positive.

RST

If X37is on, then thedatavalue representsa negative voltage.C1isset to indicate channel

SET

5-18

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

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Using 2’s Complement (Multiplexing) for D2-230, D2-240, D2-250-1, D2-260 and D2-262 CPUs

The 2’s complement data format may be required to display negative values on some operator interface devices. It could also be used to simplify data averaging on bipolar signals.

The example shows two channels, but these steps can be repeated for all eight channels if necessary.

Loaddatawhenmoduleisnot busy.

X36

StoreChannel 1

X36 X34 X35

StoreChannel 2

X36 X34 X35

X37

LD V40401

ANDD KFFF

OUT V2000

INV

BCD

ADDD K1

OUTD V2040

OUT V2001

INV

Loadsthe complete datawordintothe accumulator. TheV-memorylocation dependsonthe I/O configuration.See Appendix Afor thememorymap.

This instructionmasks thechannelidentification bits Without this,the values used will notbecorrect,so

do not forget to include it.

When themoduleis not busy, and X34, X35 and X36are off, channel1dataisstoredinV2000.C0 is resettoindicate that channel 1’svalue is positive.

RST

If X37ison, then the datavalue representsa negative v oltage. C0 is settoindicat ethat

SET

channel1’s value is negative.

Invert thebit pattern in theaccumulator.

Channel1dataisindoublewordstarting at V2040.

When themoduleis not busy, and X34ison and X35and X36are off, channel 2dataisstoredin V2001.C1isreset to indicate that channel2’s

value is positive.

RST

If X37ison, then thedatavalue representsa negative v oltage. C1 is settoindicate that

SET

channel2’s value is negative.

Invert thebit pattern in theaccumulator.

X36 X34 X35

BCD

ADDD K1

OUT V2042

Channel2dataisindoublewordstarting at V2042.

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

5-19

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Multiplexing method

Analog Power Failure Detection

The analog module has a microcontroller which can diagnose analog input circuit problems. A ladder rung can be added to program to detect these problems. This rung shows an input point that would be assigned if the module was used as shown in the previous examples. A different point would be used if the module was installed in a different I/O conﬁguration.

V2000 K0=X37

OUT

Pointers method

V2000 K8000

OUT

Scaling the Input Data

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

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

For example, if pressure (psi) is to be measured from

0.0–99.9 then multiply the value by 10 in order to imply a decimal place when viewing the value with the programming software or with a handheld programmer. Notice how the calculations differ when the multiplier is used.

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

V-memory locationV2000 holds channel 1data. Whenadatavalue of zero is returned and inputX37 is on,then theanalogcircuitry is not operating properly.

V-memory locationV2000 holds channel 1data. When a datavalue of 8000 is returned,then the analog circuitry is not operatingproperly.

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

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

5-20

Example without multiplier Example with multiplier

Units = A 4095

Units = 2024 4095

H – L

100 – 0

Units = 49

Units = 10A 4095

Units = 20240 4095

Units = 494

H – L

100 – 0

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

The Conversion Program

The following example shows how to write the program to perform the engineering unit conversion. This example assumes the raw input data read at V2000 is in BCD format.

NOTE: This example uses SP1, which is always on, but any permissive contact such as, X, C, etc., can be used.

SP1

LD V2000

MUL K1000

DIV K4095

OUT V2010

When SP1 is on, load channel1datatothe accumulator.

Multiply theaccumulator by 1000(to startthe c onv ersion).

Divide theaccumulator by 4095.

Storethe result in V2010.

Analog and Digital Value Conversions

Sometimes it is useful to be able to quickly convert between the signal levels and the digital values. This is especially helpful during machine startup or troubleshooting. Remember, that this module does not operate like other versions of analog input modules. The bipolar ranges use 0-4095 for both positive and negative voltages. The sign bit allows this, which actually provides better resolution than those modules that do not offer a sign bit. The following table provides formulas to make this conversion easier.

Range If the digital value is known

0–5 V

±5V

0–10 V

±10V

A =

4095

A =

4095

If the analog signal level is

known.

4095

D =

D = 4095

(A)

ABS(A)

As an example, if the range being used is ±10V and the measured signal is 6V, use the formula to the right to determine the digital value that is stored in the V-memory location that contains the data.

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

4095

D =

(A)

4095

D =

(6V)

D = (409.5) (6)

D = 2457

5-21

Chapter 5: F2-08AD-2, 8-Ch. Analog Voltage Input

Filtering Input Noise for D2-250-1, D2-260 and D2-262 CPUs

Add the following logic to ﬁlter and smooth analog input noise in D2-250-1, D2-260 and 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 work space 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: Please review intelligent instructions (IBox) in Chapter 5 of D2-USER-M, which simplify this and other functions. The IBox instructions are supported by the D2-250-1, D2-260 and D2-262.

NOTE: Be careful not to do a multiple number conversion on a value. For example, if you are using the pointer method to get the analog value, it is in BCD and must be converted to binary. However, if you are using the conventional method of reading analog and are masking the ﬁrst twelve bits, then it is already in binary and no conversion using the BIN instruction is needed.

SP1

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,thisinstruc tion is not neededifthe analog value is originally broughtinasabinary number.

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

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

5-22

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

Analog F2-08AD-2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Setting the Module Jumpers

Connecting the Field Wiring

Module Operation

Writing the Control Program