Chapter. F2-02DA-2, F2-02DA-2L 2-Channel Analog. In This Chapter...

Transcription

1 F-0-, F-0-L -hannel nalog hapter Voltage Output In This hapter... Module Specifications Setting the Module Jumpers onnecting and isconnecting the Field Wiring Module Operation Writing the ontrol Program

2 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Module Specifications The F-0- and F-0-L nalog Output modules provide several hardware features: nalog outputs are optically isolated from the PL logic. The modules have a removable terminal block so the module can be easily removed or changed without disconnecting the wiring. oth channels can be updated in one scan if either a L0, a L0- or a L0 PU is used in the PL. F-0-: Low-power MOS design requires less than 0m from an external V power supply. F-0-L: Low-power MOS design requires less than 0m from an external V power supply. Outputs can be independently configured for any of the following ranges: ) 0 V ) 0 V ) ±V ) ±V NOTE: The F-0- and F-0-L modules look very similar and it is very easy to mistake one module for the other. If the module being used does not work, check the terminal label to see if it is a V (L) or a V model and that it is being supplied with the proper input voltage. nalog Output onfiguration Requirements The F-0- (L) nalog output appears as a -point discrete output module. The module can be installed in any slot of a L0 PL, but the available power budget and discrete I/O points are the limiting factors. heck the L0 PL User Manual for the particular model of PU and I/O base being used for information regarding power budget and number of local, local expansion or remote I/O points. NLOG H F m NLOG 0-V +V +V H H+ H H+ N N N N 0-V +V F-0- F-0- NLOG H F-0-L -V 0m NLOG 0-V -+V +V H H+ H H+ N N N N F-0-L F-0-L - L0 nalog Manual, th Edition Rev.

3 hapter : F-0-, F-0-L, -hannel nalog Voltage Output The following tables provide the specifications for the F 0 and F-0-L nalog Output Modules. Output Specifications Number of hannels Output Range 0 V, 0 V, ±V, ±V Resolution bit ( in 0) Output Type Single ended, common Peak Output Voltage V (clamped by transient voltage suppressor) Load Impedance 000q minimum Load apacitance 0.0 µf maximum Linearity Error (end to end) ± count (±0.0% of full scale) maximum onversion Settling Time µs maximum (full scale change) Full-scale alibration Error (offset error included) Offset alibration Error Maximum Inaccuracy ccuracy vs. Temperature ± counts ( F) unipolar ± counts ( F) bipolar ± counts ( F) unipolar ± counts ( F) bipolar Unipolar ranges ± ( F) ± 0.% 0 0 ( F) ipolar ranges ± ( F) ± 0.% 0 0 ( F) ±0ppm/ full scale calibration change (including maximum offset change of counts) NOTE: One count in the specifications table is equal to one least significant bit of the analog data value ( in 0) PL Update Rate General Specifications channel per scan maximum (-0 PU) channels per scan maximum (-0/0-/0 PUs) igital Outputs Output Points Required binary data bits, channel I bits, sign bit point () output module Power udget Requirement V (supplied by the base) External Power Supply F-0-: V, 0m (outputs fully loaded) F-0-L: V, 0m (outputs fully loaded) Operating Temperature 0 0 ( F) Storage Temperature 0 0 (- F) Relative Humidity % (non-condensing) Environmental ir No corrosive gases permitted Vibration MIL ST. Shock MIL ST. Noise Immunity NEM IS-0 L0 nalog Manual, th Edition Rev. -

4 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Special Placement Requirements (L0 and Remote I/O ases) It is important to examine the configuration if a L0 PU is being used. s can be seen in the section on Writing the ontrol Program, V-memory locations are used to capture the analog data. 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 -RSSS in the PU slot. orrect! ata is correctly entered so output points start on a V-memory boundary. Incorrect MS V00 0 To use the V-memory references required for a L0 PU, the first output address assigned to the module must be one of the following locations. The table also shows the V-memory addresses that correspond to these locations. X V V000 V00 V00 V00 V00 V00 V00 V00 LS 0 Slot 0 Slot Slot Slot Slot pt Input X0 X pt Input X0 X MS pt Input X0 X pt Input X0 X pt Output 0 F-0- pt Output 0 - pt Output 0 V000 V00 V00 LS pt Output 0 0 pt Output F-0- Slot 0 Slot Slot Slot Slot 0 pt Output 0 ata is split over three locations, so instructions cannot access data from a L0. MS V00 0 LS L0 nalog Manual, th Edition Rev.

5 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Setting the Module Jumpers The F-0- (L) nalog Output module uses jumpers for selecting the voltage ranges for each channel. The range of each channel can be independently set. vailable operating ranges are 0 V, 0 V, ±V, and ±V. There are three jumpers for each channel. Two sets are on the top board, and the third set is along the edge of the bottom board with the black -shell backplane connector. Install or remove these jumpers to select the desired range. Unused jumpers can be stored on a single pin so they do not get lost. Two of the top board jumpers are labeled UNI / ± and there is one for each channel. The two bottom board jumpers are labeled UNI and there is one for each channel. These jumpers determine the format of the channel output data, and the effect of their settings is independent from that of the other jumpers on the module. With a UNI jumper removed, the corresponding channel requires data values in the range of ±0. With a UNI jumper installed, the channel requires data values in the range of 0 0. The other two top board jumpers are labeled I-P 0- and there is one for each channel. These jumpers each have three possible settings (including jumper removed) since there are three pins. NOTE: It is important to set the module jumpers correctly. The module will not operate correctly if the jumpers are not properly set for the desired voltage range. This figure shows the jumper locations. See the table on the following page to determine the proper settings for your application. Old ouble P esign and Jumper Locations ate ode ffected: mmyye and earlier F-0- UNI H UNI H I I H Jumper locations have moved. H UNI H UNI H UNI H UNI H H I I New Single P esign and Jumper Locations ate ode ffected: mmyyf and later F-0- H H H H UNI H UNI H UNI I UNI I L0 nalog Manual, th Edition Rev. -

6 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Voltage Range and Output ombinations The table lists the eight possible combinations of voltage ranges and data formats, along with the corresponding jumper settings. For most applications, use one of the four standard selections shown in the shaded blocks in the table. Standard unipolar voltage ranges accept a data format of 0 0. Standard bipolar ranges accept a data format of -0 to +0. Voltage Range Output ata Format Standard selections are shown with an *. For example, to select settings of ±V voltage range with a ±0 output data format for channel, refer to the table above and the figure on the previous page and arrange the jumpers as follows: Install the H UNI / ±V jumper. Voltage Range and Output ombinations UNI / ± V Jumper Settings (top board) UNI Output Format Jumper Settings (bottom board) I-P 0 V Jumper Settings (top board) I-P (ipolar) 0 V Position Position 0 V * 0 0 * Install Install Install here 0 V * 0 0 * Install Install ompletely remove 0 V ± 0 Install Remove Install here 0 V ± 0 Install Remove ompletely remove ± V * ± 0 * Install Remove Install here ± V * ± 0 * Remove Remove Install here ± V 0 0 Install Install Install here ± V 0 0 Remove Install Install here Remove the H-UNI jumper. Store the jumper so it does not get lost by placing it on one pin. Install the H I-P 0- jumper in the I-P (bipolar) position on the left pin and center pin. The non-standard selections in the table provide the opposite data format for both unipolar and bipolar voltage ranges. If you are using unipolar output (0-V or 0-V) on one channel and bipolar output (±V, ±V) on the other channel, then one of the outputs will use a non-standard data format. - L0 nalog Manual, th Edition Rev.

7 hapter : F-0-, F-0-L, -hannel nalog Voltage Output The following graphs show the voltage range to output data format relationship for each of the eight selections. Unipolar Ranges V 0 ipolar Ranges V V V 0 V V (.V) V V +V +V +V ± V ± V - V - V - V - V (+0) +0 0 (+0) +0 V (V) ± V ± V L0 nalog Manual, th Edition Rev. -

8 hapter : F-0-, F-0-L, -hannel nalog Voltage Output onnecting and isconnecting the Field Wiring Wiring Guidelines our 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. o not ground the shield at both the module and the source. o 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. heck local and national codes to choose the correct method for your application. User Power Supply Requirements The F-0- requires an external power supply. The same or separate power sources may be used for the module supply and loop supply. The module requires V, at 0m while the F-0-L requires V, at 0m. The L0 bases have internal V power supplies that provide up to 00m of current. This power source could be used instead of a separate power supply if only a few analog modules are being used. If a separate power supply is to be used, choose one that meets the power requirements of the application. WRNING: If the internal V 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. - L0 nalog Manual, th Edition Rev.

9 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Wiring iagram The F-0- (L) 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. h load K ohms minimum h load K ohms minimum Typical User Wiring See NOTE V + See NOTE 0m H- H- N/ N/ +V NOTE : Shields should be connected to the terminal of the module or of the power supply. NOTE : The F-0-L module must use a V, at 0m, external power supply. H+ H+ N/ N/ OV Internal Module Wiring +V +V F-0- V - h 0m NLOG Voltage sink/source 0-V +V to onverter +V H h Voltage sink/source H+ to H onverter H+ N Transient protected precision N digital to analog converter N output circuits N 0-V +V F-0- to onverter NLOG H L0 nalog Manual, th Edition Rev. -

10 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Module Operation efore beginning to write the control program, it is important to take a few minutes to understand how the module processes the analog signals. hannel Scanning Sequence for a L0 PU (Multiplexing) The L0 can send one channel of data per PU scan. The module refreshes two field devices on each scan, but new data can only be obtained from the PU at the rate of one channel per 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 will be updated on every scan. The multiplexing method can also be used for the L0, L0-, and L0 PUs. Scan alculate the data Write data Read inputs Executepplication Program Write to outputs Scan N Scan N+ Scan N+ Scan N+ Scan N+ System With L0 PU hannel hannel hannel hannel hannel - L0 nalog Manual, th Edition Rev.

11 hapter : F-0-, F-0-L, -hannel nalog Voltage Output hannel Scanning Sequence for L0, L0-, and L0 PUs (Pointer Method) If either a L0, L0- or L0 PU is used, both channels can be updated on every scan. This is because the three PUs support special V-memory locations that are used to manage the data transfer. This is discussed in more detail in the next section on Writing the ontrol Program. Scan alculate the data Write data Read inputs Executepplication Program Write to outputs Scan N Scan N+ Scan N+ Scan N+ Scan N+ System With L0/0 - /0 PU hannel, hannel, hannel, hannel, hannel, L0 nalog Manual, th Edition Rev. -

12 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Understanding the Output ssignments Remember that the F-0- (L) module appears to the PU as a -point discrete output module. These points provide the data value and an indication of which channel to update. Note, if either a L0, L0 or L0 PU 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. The individual bits in this data word location, represents specific information about the analog signal. hannel Select Outputs 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. y controlling these outputs, the channel(s) to be updated can be selected. hannel On Off Off On Off Off & (same data to both channels) On On None (both channels hold current values) F-0- Slot 0 Slot Slot Slot Slot pt Input X0 X MS pt Input X0 X Not Used MS pt Output pt Output V000 V00 V00 LS ata its V00 pt Output 0 = channel select outputs 0 LS 0 - L0 nalog Manual, th Edition Rev.

13 hapter : F-0-, F-0-L, -hannel nalog Voltage Output nalog ata its The first twelve bits represent the analog data in binary format. it Value it Value 0 0 Signal Sign Output The last output can be used to select the signal sign (+ or -) for bipolar ranges. y controlling this output, positive and negative data values can be easily selected. Programming examples in the next section, Writing the ontrol Program, will show how to make sign selection part of the program. ipolar Output ata If an output channel is configured for an output format of 0 0, the maximum valid value for the lower bits is 0. This means that bit (bit position ) must always be 0 (zero). MS MS V00 WRNING: If the data value exceeds 0, bit becomes a, and the other eleven bits start over at t this point the module s channel output voltage also goes back to the bottom of its range and begins to increase again. The RLL program will be expecting a maximum output, but it will be minimum instead. This can have serious consequences in some applications, and may result in personal injury or damage to equipment. Therefore, in standard bipolar ranges (or whenever the output format is ±0 in general), be sure that the RLL program does not create numbers with absolute values greater than 0. MS LS 0 = data bits V00 =signal sign output 0 LS V00 LS = data bits it must be 0 for output format 0. 0 L0 nalog Manual, th Edition Rev. -

14 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Module Resolution Since the module has -bit resolution, the analog signal is converted into 0 counts ranging from 0 0 ( ). For example, with a 0 V range, send a 0 to get a signal, and send 0 to get a V signal. This is equivalent to a binary value of to, or 000 to FFF hexadecimal. Each count can also be expressed in terms of the signal level by using the following equation. V 0 V 0 Resolution = H L 0 H = High limit of the signal range L = Low limit of the signal range The following table shows the smallest change in signal level due to a digital value change of LS count. Voltage Range Signal Span ivide y Smallest Output hange 0 V V 0.mV 0 V V 0.mV ± V V 0.mV ± V 0.mV - L0 nalog Manual, th Edition Rev.

15 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Writing the ontrol Program alculating the igital 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. djustments may have to be made to the formula depending on the scale of the engineering units. = U 0 H L = U 0 H L onsider the following example which controls pressure from 0.0. PSI. Using the formula will calculate the digital value to be sent to the analog output. The example shows the conversion required to yield. PSI. The multiplier of is because the decimal portion of. cannot be loaded in the program, so it is shifted right one decimal place to make a usable value of. Refer to the example on the next page to write the conversion program for 0 0 output format for 0 0 output format = nalog Value (0 0) U = Engineering Units H = High limit of the engineering unit range L = Low limit of the engineering unit range = U 0 = 0 = 0 (H L) 00 0) L0 nalog Manual, th Edition Rev. -

16 hapter : F-0-, F-0-L, -hannel nalog Voltage Output The onversion Program This example program shows how to write the program to perform the engineering unit conversion to output data formats 0 0. This example assumes that a value has been stored in V00 and V0 for channels and respectively. NOTE: The L0 has many instructions available so that math operations can simply be performed using format. o the math in, then convert to binary before writing to the module output. SP SP L V00 MUL K0 IV K00 V000 L V0 MUL K0 IV K00 V00 The Linstruction loads the engineering units used with channel into the accumulator. This example assumes the numbers are. Since SP is used, this rung automatically executes on every scan. ou could also use anx,,etc. permissive contact. Multiply the accumulator by 0 (to start the conversion). ivide the accumulator by 00 (because we used amultiplier of, we have touse 00 instead of 0). Store the result inv000 (the actual steps required to send the data are shown later). The Linstruction loads the engineering units used with channel into the accumulator. This example assumes the numbers are. Since SP is used, this rung automatically executes on every scan. ou could also use anx,,etc. permissive contact. Multiply the accumulator by 0 (to start the conversion). ivide the accumulator by 00 (because we used amultiplier of, we have to use 00 instead of 0). Store the result inv00 (the actual steps required to send the data are shown later). - L0 nalog Manual, th Edition Rev.

17 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Negative Values with ipolar Range If the bipolar ranges (±V, ±V) are used or an output data format of ±0, the data value needs to be specified whether it is positive or negative. There are two ways to show that the value is negative: Turn on the sign output ( in the examples, L0 only). Embed the sign output in the data value (required for the L0/0-/0 using the pointer method, an optional method for the L0). To embed the sign output in the data values, OR 000 to the value. This has the same effect as turning on. Remember, the V-memory location is mapped directly to the outputs. If bipolar ranges are used, logic needs to be added to indicate either positive or negative values. The logic would be similar for both values, but some type of permissive contact needs to be used to select the appropriate section of logic. Following is an example that re-scales a variable from a 0 00 range to a 0 0 range. It includes a step that combines 000 with the value to make it negative. NOTE: o not exceed a value of 0 for ±0 output formats. X0 X0 X0 X0 X0 X0 hannel X hannel X L V00 MUL K0 IV K00 OR K000 V000 L V0 MUL K0 IV K00 OR K000 V00 The L instruction loads the engineering units used with hannel into the accumulator. This example assumes the numbers are. Since X0 is used, this rung only executes when X0 is on (X would be the input that would indicate a negative value should be used). Multiply the accumulator by 0 (to start the conversion). ivide the accumulator by 00 (because we used a multiplier of, we have to use 00 instead of 0). This OR instruction imbeds the sign output in the data value when X0 and X are on. It combines the value (000) with the accumulator value to make it negative. Omit this rung if you choose to control the sign bit ofthe module () directly. Store the result in V000. This is the digital value, in form, that should be sent to the module (the actual steps required to send the data are shown later). The Linstruction loads the engineering units used with hannel into the accumulator. This example assumes the numbers are. Since X0 is used, this rung only executes when X0 is on (X would be the input that would indicate anegative value should be used). Multiply the accumulator by 0 (to start the conversion). ivide the accumulator by 00 (because we used a multiplier of, we have to use 00 instead of 0). This OR instruction imbeds the sign output in the data value when X0 and X are on. It combines the value (000) with the accumulator value to make it negative. Omit this rung if you choose to control the sign bit ofthe module () directly. Store the result in V00. This is the digital value, in form, that should be sent to the module (the actual steps required to send the data are shown later). L0 nalog Manual, th Edition Rev. -

18 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Writing Values: Pointer Method and Multiplexing Two methods are used to read data values in the L0, pointer and multiplexing. When to use either method and how to use it will be discussed here. Since the pointer method will not work if the PL has a L0 installed, only the multiplexing method can be used. Either method for reading the data values can be used with the L0, L0- and L0 PUs, however, the pointer method will simplify programming the PL. Writing Values (Pointer Method) for the L0, L0- and L0 PUs Once the data values have been calculated they must be entered into the program in order to output the values. The L0 series has special V-memory locations assigned to each base slot that will greatly simplify the programming requirements. With these V-memory locations, the number of channels to update are specified, also, where to read the data that is written to the output is specified. NOTE: L0 PUs with firmware release version. or later and. L0 PUs with firmware release version.0 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. This is all that is required to write the data to V-memory locations. Once the data has been written to V-memory math can be used on the data, compare the data against preset values, etc. V000 is used in the example but any user V-memory location can be used. In this example the module is installed in slot. e sure to use the V-memory locations for the module placement. The pointer method automatically converts values to. SP0 L -or- L K K V L O000 V0 Loads a constant that specifies the number of channels to scan and the data format. The lower byte, most significant nibble (MSN) selects the data format (i.e. 0=, =inary), the LSN selects the number ofchannels (or). The binary format is used for displaying data on some operator interfaces. The L0/0 PUs do not support binary math functions, whereas the L0 does. Special V-memory location assigned to slot that contains the number ofchannels to scan. This loads an octal value for the first V-memory location that will be used to store the output data. For example, the O000 entered here would designate the following addresses. h - V000, h - V00 The octal address (O000) isstored here. V0 isassigned toslot and acts as a pointer, which means the PU will use the octal value in this location to determine exactly where tostore the output data. - L0 nalog Manual, th Edition Rev.

19 hapter : F-0-, F-0-L, -hannel nalog Voltage Output The following tables show the special V-memory locations used by the L0, L0- and L0 for the PU base and local expansion base I/O slots. Slot 0 (zero) is the module next to the PU or -M module. Slot is the module two places from the PU or -M, and so on. Remember, the PU only examines the pointer values at these locations after a mode transition. lso, if the L0 (multiplexing) method is used, verify that these addresses in the PU are 0 (zero). The table below applies to the L0, L0- and L0 PU base. PU ase: nalog Output Module Slot-ependent V-memory Locations Slot 0 No. of hannels V0 V V V V V V V Storage Pointer V00 V0 V0 V0 V0 V0 V0 V0 The table below applies to the L0- or the L0 PU base. Expansion ase -M #: nalog Output Module Slot-ependent V-memory Locations Slot 0 No. of hannels V000 V00 V00 V00 V00 V00 V00 V00 Storage Pointer V00 V0 V0 V0 V0 V0 V0 V0 The table below applies to the L0- or the L0 PU base. Expansion ase -M #: nalog Output Module Slot-ependent V-memory Locations Slot 0 No. of hannels V0 V V V V V V V Storage Pointer V V V V V V V V The table below applies to the L0 PU base. Expansion ase -M #: nalog Output Module Slot-ependent V-memory Locations Slot 0 No. of hannels V00 V0 V0 V0 V0 V0 V0 V0 Storage Pointer V0 V V V V V V V The table below applies to the L0 PU base. Expansion ase -M #: nalog Output Module Slot-ependent V-memory Locations Slot 0 No. of hannels V00 V0 V0 V0 V0 V0 V0 V0 Storage Pointer V0 V V V V V V V L0 nalog Manual, th Edition Rev. -

20 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Writing ata (Multiplexing) The L0 PU does not have the special V-memory locations that allows for automatic enabling the data transfer. Since all channels are multiplexed into a single data word, the control program must be written in such a way to determine which channel to write the data to. Since the module appears as output points to the PU, it is very easy to use the channel selection outputs to determine which channel to update. The following example is for a module installed as shown in previous examples. The addresses used would be different if the module were located in a different slot. These rungs can be placed anywhere in the user program or, if using stage programming, placed in an active stage. This example is a two-channel multiplexer that updates each channel on alternate scans. Relay SP is a special relay that is on for one scan, then off for one scan. permissive contact on the last rung handles an embedded sign bit. NOTE: Use binary data to write to the module outputs. o not use a IN instruction if the data is already in binary format. Load data into the accumulator. SP L V000 SP L V00 Loads the data for channel into the accumulator. Send data to V-memory assigned to the module. SP IN onvert the data tobinary (you must omit this step if you have converted the data elsewhere). N KFFF V00 Select the channel to update. SP SP SP SP V000 V00 K000 K000 Loads the data for channel into the accumulator. Remove sign bit for to binary conversion. SP is always on. The instruction sends the data to the module. Our example starts with V00 but the actual value depends onthe location ofthe module in your application. Selects channel for update when isoff (-ON deselects channel ). Note, and are used due to the previous examples. If the module was installed in adifferent I/O arrangement, the addresses would bedifferent. Selects channel for update when isoff (-ON deselects channel ). Note, and are used due to the previous examples. If the module was installed in a different I/O arrangement, the addresses would be different. If the output format is -0 to +0, include this rung to embed the sign bit. For the output format 0to 0, omit this rung. -0 L0 nalog Manual, th Edition Rev.

21 hapter : F-0-, F-0-L, -hannel nalog Voltage Output If the output range format of ±0 is used (also most commonly used with bipolar voltage ranges), the data values must be specified as either positive or negative. The previous example could be used with an addition to activate the sign output bit, or use the following example which uses individual contacts to determine the sign bit status for each channel. WRNING: O NOT USE THIS METHO if the sign information is embedded into the data value by adding 000 to it. Use the previous example. Load data into the accumulator. SP L V000 SP L V00 Loads the data for channel into the accumulator. Send data to V-memory assigned to the module. SP onvert the data tobinary (you must omit this step if IN you have converted the data tobinary). SP is always on. V00 Select the channel to update. SP SP SP SP X X Loads the data for channel into the accumulator. The instruction sends the data to the module. Our example starts with V00, but the actual value depends onthe location ofthe module inyour application. Selects channel for update when isoff (-ON deselects channel ). Note, and are used due tothe previous examples. Ifthe module was installed in a different I/O arrangement, the addresses would bedifferent. Selects channel for update when isoff (-ON deselects channel ). Note, and are used due tothe previous examples. Ifthe module was installed in a different I/O arrangement, the addresses would bedifferent. The permissive X activates (sign bit) during a channel update scan. The permissive X activates during a channel update scan. The sign bit ( ON) indicates that the value is negative. oucould use another permissive, such as a R, etc. NOTE: o not exceed a value of 0 for ±0 output data formats. L0 nalog Manual, th Edition Rev. -

22 hapter : F-0-, F-0-L, -hannel nalog Voltage Output - Write ata to One hannel The following example can be used if only one channel is to be written to, or if the outputs are to be controlled individually. on t forget to either embed the sign information or use the sign output bit for bipolar ranges. SP X L V000 IN V00 Write ata to oth hannels In the example below, if both selection channels are off, they will be updated with the same data. Remember to either embed the sign information or use the sign output bit. SP X N K0FFF L V000 IN N K0FFF V00 RST RST RST L0 nalog Manual, th Edition Rev. The L instruction loads the data into the accumulator. Since SP is used, this rung automatically executes on every scan. ou could also use an X,, etc. permissive contact. The IN instruction converts the accumulator data to binary (you must omit this step if you have already converted the data elsewhere). The N instruction masks off the channel select bits to prevent an accidental channel selection. The instruction sends the data tothe module. Our example starts with V00, but the actual value depends onthe location of the module in your application. -OFF selects channel for updating. -ON deselects channel (do not update). The permissive Xactivates, which isthe sign bit. The sign bit indicates that the value is negative. ou could use another permissive, such as a R, etc. Omit this rung if you are using the 0to+0 output format. The L instruction loads the data into the accumulator. Since SP is used, this rung automatically executes on every scan. ou could also use an X,, etc. permissive contact. The IN instruction converts the accumulator data to binary (you must omit this step if you have already converted the data elsewhere. The N instruction masks off the channel select bits to prevent an accidental channel selection. The instruction sends the data tothe module. Our example starts with V00, but the actual value depends onthe location of the module in your application. -OFF selects channel for updating. -OFF selects channel for updating. The permissive Xactivates, which isthe sign bit. The sign bit indicates that the value is negative. ou could use another permissive, such as a R, etc. Omit this rung if you are using the 0to+0 output format.

23 hapter : F-0-, F-0-L, -hannel nalog Voltage Output nalog and igital Value onversions 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 to help with the conversions. Range The digital value is known The analog signal level is known 0 V = 0 ±V (output format ±0) 0 V ± V (output format ±0) = 0 = 0 = 0 For example, if a ±V range with an output format of ±0 is used, and a V signal level is needed, use the formula to the right to determine the digital value to be stored in the V-memory location which contains the data. = 0 () = 0 () = 0 () = 0 () = 0 () = 0 (V) = (0.) () = L0 nalog Manual, th Edition Rev. -

24 hapter : F-0-, F-0-L, -hannel nalog Voltage Output Notes - L0 nalog Manual, th Edition Rev.