Chapter. F0-04AD-1, 4-Channel Analog Current Input. In This Chapter...

Transcription

1 F0-0-, -hannel nalog urrent Input hapter In This hapter... Module Specifications... Setting the Module Jumper... onnecting and isconnecting the Field Wiring... Wiring iagram... Module Operation... Special V-memory Locations... Using the Pointer in Your ontrol Program... etecting Input Signal Loss... Scale onversions... Special Relays... Module Resolution... nalog Input Ladder Logic Filter...

2 hapter : F0-0-, -hannel nalog urrent Input 0 Module Specifications The F0-0- nalog Input module offers the following features: The L0 and L0 will read all four channels in one scan. The removable terminal block makes it possible to remove the module without disconnecting the field wiring. nalog inputs can be used as process variables for the four () PI loops in the L0 and the eight () PI loops in the L0 PUs. Field device burnout is detected on all four channels when 0m range is selected. On-board active analog filtering and RIS-like microcontroller provide digital signal processing to maintain precise analog measurements in noisy environments. NOTE: The L0 PU s analog feature for this module requires irectsoft Version.0c (or later) and firmware version.0 (or later). The L0 requires irectsoft version V.0, build (or later) and firmware version.00 (or later). See our website for more information: L0/0 Option Modules User Manual; th Ed. Rev., 0/

3 hapter : F0-0-, -hannel nalog urrent Input The following tables provide the specifications for the F00 nalog Input Module. Review these specifications to make sure the module meets your application requirements. Input Specifications Number of hannels, single ended (one common) Input Range 0 to 0m or to 0m current (jumper selectable) Resolution bit ( in 0) for 00 m, scaled for 0 m Step Response.0 ms (typ) to % of full step change rosstalk -0 d, / count maximum * ctive Low-pass Filtering -d at 0Hz (- d per octave) Input Impedance Ohm ± 0.%, / W current input bsolute Maximum Ratings -0m to 0m current input onverter type Successive approximation Linearity Error (End to End) ± counts maximum * Input Stability ± count * Full Scale alibration Error (Offset error not included) ± 0 counts 0m current input* Offset alibration Error ± counts m current input * Maximum Inaccuracy ± ( F) ± 0.% 0 to 0 ( to 0 F) ccuracy vs. Temperature ±00ppm / maximum full scale calibration (including maximum offset change) Recommended Fuse (external) 0.0 Series fast-acting current inputs * One count in the specification table is equal to one least significant bit of the analog data value ( in 0). General Specifications PL Update Rate channels per scan -bit ata Word binary data bits Operating Temperature 0 to 0 ( to 0 F) Storage Temperature -0 to 0 (- to F) Relative Humidity to % (non-condensing) Environmental air No corrosive gases permitted Vibration MIL ST 0. Shock MIL ST 0. Noise Immunity NEM IS-0 Power udget Requirement V (supplied by base) onnector Phoenix Mecano, Inc. Part No. K0/-. - green onnector Wire Size WG onnector Screw Torque 0. N m onnector Screwdriver Size N-SS (recommended) 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

4 hapter : F0-0-, -hannel nalog urrent Input 0 Setting the Module Jumper The position of jumper J determines the input signal level. You can choose between 0 m and 00 m. The module ships with the jumper not connecting the two pins. In this position, the expected input signal is 0 m. To select 00 m signals, use the jumper to cover both pins. The default jumper setting selects a 0 m signal source. The default jumper setting does not connect the two pins. WRNING: efore removing the analog module or the terminal block on the face of the module, disconnect power to the PL and all field devices. Failure to disconnect power can result in damage to the PL and/or field devices. onnecting and isconnecting the Field Wiring Wiring Guidelines Your company may have guidelines for wiring and cable installation. If so, you should check those before you begin the installation. Here are some general things to consider: Use the shortest wiring route whenever possible. 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. The F00 does not supply power to field devices. You will need to power transmitters separately from the PL. To remove the terminal block, disconnect power to the PL and the field devices. Pull the terminal block firmly until the connector separates from the module. You can remove the analog module from the PL by folding out the retaining tabs at the top and bottom of the module. s the retaining tabs pivot upward and outward, the module s connector is lifted out of the PL socket. Once the connector is free, you can lift the module out of its slot. OFF = 0 J L0/0 Option Modules User Manual; th Ed. Rev., 0/

5 hapter : F0-0-, -hannel nalog urrent Input Wiring iagram Use the following diagram to connect the field wiring. If necessary, the F00 terminal block can be removed to make removal of the module possible without disturbing field wiring. See NOTE H wire 0m Transmitter H wire 0m Transmitter H -wire 0m Transmitter H -wire 0m Transmitter NOTE : Shields should be grounded at the signal source. NOTE : onnect all external power supply commons. NOTE : Series, 0.0 fastacting fuse is recommended for current loops. Typical User Wiring -0V Supply Transmitter Supply H H H H H H H H urrent Loop Transmitter Impedance Manufacturers of transmitters and transducers specify a wide variety of power sources for their products. Follow the manufacturer s recommendations. In some cases, manufacturers specify a minimum loop or load resistance that must be used with the transmitter. The F0-0- provides ohm resistance for each channel. If your transmitter requires a load resistance below ohms, you do not have to make any changes. However, if your transmitter requires a load resistance higher than ohms, you need to add a resistor in series with the module. onsider the following example for a transmitter being operated from a 0 V supply with a recommended load resistance of 0 ohms. Since the module has a ohm resistor, you need to add an additional resistor. R = TrMr R = resistor to add R = 0 Tr = Transmitter Requirement R M Mr = Module resistance (internal ohms) Two-wire Transmitter Module hannel Supply 0V 0V Internal Module Wiring OV ohms ohms ohms ohms nalog Switch to onverter R nalog Inpu t HNNELS 0 0m 0m H H H H F0 0 H OM PWR RUN PU TX RX TX RX 0V ohms 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

6 hapter : F0-0-, -hannel nalog urrent Input 0 Module Operation hannel Scanning Sequence The L0 and L0 will read all four channels of input data during each scan. Each PU supports special V-memory locations that are used to manage the data transfer. This is discussed in more detail beginning in the section on Special V-memory Locations. Scan Read Inputs Execute pplication Program Read the data Store data Write to Outputs Scan N Scan N Scan N Scan N Scan N L0/L0 PL h,,, h,,, h,,, h,,, h,,, nalog Module Updates Even though the channel updates to the PUs are synchronous with the PU scan, the module asynchronously monitors the analog transmitter signals and converts each signal into a -bit binary representation. This enables the module to continuously provide accurate measurements without slowing down the discrete control logic in the RLL program. The module takes approximately milliseconds to sense % of the change in the analog signal. For the vast majority of applications, the process changes are much slower than these updates. NOTE: If you are comparing other manufacturers update times (step responses) with ours, please be aware that some manufacturers refer to the time it takes to convert the analog signal to a digital value. Our analog to digital conversion takes only a few microseconds. It is the settling time of the filter that is critical in determining the full update time. Our update time specification includes the filter settling time. L0/0 Option Modules User Manual; th Ed. Rev., 0/

7 hapter : F0-0-, -hannel nalog urrent Input Special V-memory Locations Formatting the Module ata The L0 and L0 PLs have special V-memory locations assigned to their respective option slots. These V-memory locations allow you to: specify the data format (binary or ) specify the number of channels to scan ( channels for the F00) specify the V-memory locations to store the input data L0 ata Formatting The table below shows the special V-memory locations used by the L0 PL for the F00. nalog Input Module L0 Special V-memory Locations ata Type and Number of hannels Storage Pointer Structure of V00 Special V-memory location 00 indicates that a F00 module is installed in the L0 option slot and the data type to be either binary or. Loading a constant of 00 into V00 identifies a -channel analog input module is installed in the L0 option slot, and reads the input data values as numbers. Loading a constant of 00 into V00 identifies a -channel analog input module is installed in the L0 option slot, and reads the input data values as binary numbers. V00 V0 Structure of V0 V0 is a system V-memory location used as a pointer to a user V-memory location where the analog input data is stored. The V-memory location loaded into V0 is an octal number identifying the first user V-memory location for reading the analog input data. This V-memory location is user selectable. For example, loading O000 causes the pointer to write h s data value to V000, h s data value to V00, h s data value to V00, and h s data value to V00. You will find an example program that loads appropriate values to V00 and V0 on page. MS LS 0 0 MS LS L0/0 Option Modules User Manual; th Ed. Rev., 0/

8 hapter : F0-0-, -hannel nalog urrent Input 0 L0 ata Formatting Special V-memory locations are assigned to the four option slots of the L0 PL. The table below shows these V-memory locations which can be used to setup the F00. nalog Input Module L0 Special V-memory Locations Slot No. ata Type and Number of hannels V00 V0 V0 V0 Storage Pointer V0 V V V Setup ata Type and Number of hannels V-memory locations 00, 0, 0 and 0 are used to set the data format to be read in either binary or, and to set the number of channels that will be active. For example, the F00 is installed in slot. Loading a constant of 00 into V00 sets channels active, and the input data value is read as a number. With the F0 in slot, loading a constant of 00 into V00 sets channels active, and the input data value is read as a binary number. Storage Pointer Setup V-memory locations 0,, and are special locations used as storage pointers. V-memory address is loaded into this location as an octal number identifying the first user V-memory location for the analog input data. This V-memory location is user selectable. For example, loading O000 causes the pointer to write h s data value to V000, h s data value to V00, h s data value to V00, and h s data value to V00. You will find an example program that loads appropriate values to V00 and V0 beginning on page 0. MS LS 0 0 MS LS 0 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

9 hapter : F0-0-, -hannel nalog urrent Input Using the Pointer in Your ontrol Program L0 Pointer Method The L0 PU examines the pointer values (the memory locations identified in V00 and V0) on the first scan only. The example program below shows how to setup these locations. This rung can be placed anywhere in the ladder program or in the initial stage if you are using stage programming instructions. This is all that is required to read the analog input data into V-memory locations. Once the data is in V-memory you can perform math on the data, compare the data against preset values, and so forth. V000 is used in the example but you can use any user V-memory location. SP0 L K00 - or - L K00 OUT V00 L O000 OUT V0 Loads a constant that specifies the number of channels to scan and the data format. The upper byte selects the data format (i.e. 0=, =inary) and the number of channels (set to for the F00). The binary format is used for displaying data on some operator interface units. The L0 PLs support binary math functions. Special V-memory location assigned to the option slot contains the data format and the number of channels to scan. This loads an octal value for the first V-memory location that will be used to store the incoming data. For example, the O000 entered here would designate the following addresses. h V000, h V00, h V00, h V00 The octal address (O000) is stored here. V0 is assigned to the option slot and acts as a pointer, which means the PU will use the octal value in this location to determine exactly where to store the incoming data. 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

10 hapter : F0-0-, -hannel nalog urrent Input 0 L0 Pointer Method Use the special V-memory table below as a guide to setup the storage pointer in the following example for the L0. Slot is the left most option slot. The PU will examine the pointer values at these locations only after a mode transition. nalog Input Module L0 Special V-memory Locations Slot No. No. of hannels V00 V0 V0 V0 Input Pointer V0 V V V The F00 can be installed in any available L0 option slot. Using the example program from the previous page, but changing the V-memory addresses, the ladder diagram below shows how to setup these locations with the module installed in slot of the L0. Use the above table to determine the pointer values if locating the module in any of the other slot locations. Place this rung anywhere in the ladder program or in the initial stage if you are using stage programming instructions. Like the L0 example, this logic is all that is required to read the analog input data into V-memory locations. Once the data is in V-memory you can perform mathematical calculations with the data, compare the data against preset values, and so forth. V000 is used in the example but you can use any user V-memory location. SP0 L K00 - or - L K00 OUT V00 L O000 OUT V0 Loads a constant that specifies the number of channels to scan and the data format. The upper byte selects the data format (i.e. 0=, =inary) and the number of channels (set to for the F00). The binary format can be used for displaying data on some operator interface units and the L0 L display. The L0 PLs support binary math functions. Special V-memory location assigned to the first option slot contains the data format and the number of channels to scan. This loads an octal value for the first V-memory location that will be used to store the incoming data. For example, the O000 entered here would designate the following addresses. h V000, h V00, h V00, h V00 The octal address (O000) is stored here. V0 is assigned to the first option slot and acts as a pointer, which means the PU will use the octal value in this location to determine exactly where to store the incoming data. 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

11 hapter : F0-0-, -hannel nalog urrent Input etecting Input Signal Loss nalog Signal Loss The F00 analog module can sense the loss of analog input signals in 0 m loops. The Special Relays described on page allow you to use this feature in your ladder program. For example, in the rung below SP0 is used to pull-in coil Y, which would be used to open or close an external circuit. NOTE: The F00 analog module cannot sense the loss of analog input signals in 00 m loops. See page for information about setting the jumper to select your input type. Scale onversions Scaling the Input ata Many applications call for measurements in engineering units, which can be more meaningful than raw data. onvert to engineering units using the formula shown to the right. You may have to make adjustments to the formula depending on the scale you choose for the engineering units. For example, if you wanted to measure pressure (PSI) from 0.0 to. then you would have to multiply the analog value by 0 in order to imply a decimal place when you view the value with the programming software or a handheld programmer. Notice how the calculations differ when you use the multiplier. nalog Value of 0, slightly less than half scale, should yield. PSI Example without multiplier Units = H L L 0 Units = Units = SP0 Example with multiplier Units =0 H L L 0 Units = Units = Y OUT The Special Relay SP0 detects a loss of input signal to channel. Use SP0 to trigger an alarm or shut down a machine. Units = H L 0 0 L H = High limit of the engineering unit range L = Low limit of the engineering unit range = nalog value (0 0) 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

12 hapter : F0-0-, -hannel nalog urrent Input 0 The onversion Program The following example shows how you would write the program to perform the engineering unit conversion. This example assumes you have data loaded into the appropriate V-memory locations using instructions that apply for the model of PU you are using. Note: this example uses SP, which is always on. You could also use an X,, etc. permissive contact. SP L V000 MUL K000 IV K0 OUT V00 nalog and igital Value onversions Sometimes it is useful to convert between the signal levels and the digital values. This is especially helpful during machine startup or troubleshooting. The following table provides formulas to make this conversion easier. For example, if you have measured the signal as 0m, you can use the formula to determine the digital value that will be stored in the V-memory location that contains the data. When SP is on, load channel data to the accumulator. Multiply the accumulator by 000 (for a range of 0000). ivide the accumulator by 0 (the module resolution). Store the result in V00. Range If you know the digital value If you know the analog signal level to 0m = 0 0 to 0m = 0 0 = 0 ( - ) = 0 0 = 0 0 = 0 0 = 0.. 0m L0/0 Option Modules User Manual; th Ed. Rev., 0/

13 hapter : F0-0-, -hannel nalog urrent Input Special Relays The list of other Special Relays associated with the L0 and L0 PLs are contained in the L0 User Manual and the L0 User Manual. The following special relays are new and relate to the status of the F00 module or one of its input channels. L0 Special Relays L0 Special Relays SP00 han input type 0 = 00m = 0m SP0 han input type 0 = 00m = 0m SP0 han input type 0 = 00m = 0m SP0 han input type 0 = 00m = 0m SP0 han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good L0 SpecialRelays L0 Special Relays SLOT SP0 han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP0 han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SLOT SP0 han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP han input type 0 = 00m = 0m SP0 han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

14 hapter : F0-0-, -hannel nalog urrent Input 0 L0 Special Relays (cont d) SLOT SP0 han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP0 han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SLOT SP0 han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP han input type 0 = 00 m = 0 m SP0 han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good SP han input open = xmitter signal open 0 = xmitter signal good L0/0 Option Modules User Manual; th Ed. Rev., 0/

15 hapter : F0-0-, -hannel nalog urrent Input Module Resolution nalog ata its The first twelve bits represent the analog data in binary format. it Value it Value Resolution etails Since the module has -bit resolution, the analog signal is converted into 0 counts ranging from 0-0 ( ). For example, a m signal would be 0 and a 0m signal would be 0. 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: 0m m 0 m 0 0 MS Resolution = H L 0 H = high limit of the signal range L = low limit of the signal range The following table shows the smallest detectable signal change that will result in one LS change in the data value for each increment of the signal change. m Range Signal Span (H L) ivide y Smallest etectable hange to 0m m 0.0 µ 0 to 0m 0m 0. µ LS 0 = data bits 0 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

16 0 hapter : F0-0-, -hannel nalog urrent Input nalog Input Ladder Logic Filter PI Loops / Filtering: Please refer to the PI Loop Operation chapter in the L0 or L0 User Manual for information on the built-in PV filter (L0/0) and the ladder logic filter (L0 only) shown below. filter must be used to smooth the analog input value when auto tuning PI loops to prevent giving a false indication of loop characteristics. Smoothing the Input Signal (L0 only): The filter logic can also be used in the same way to smooth the analog input signal to help stabilize PI loop operation or to stabilize the analog input signal value for use with an operator interface display, etc. WRNING: The built-in and logic filters are not intended to smooth or filter noise generated by improper field device wiring or grounding. Small amounts of electrical noise can cause the input signal to bounce considerably. Proper field device wiring and grounding must be done before attempting to use the filters to smooth the analog input signal. Using inary ata Format SP L V000 TOR SUR V00 MULR R0. R V00 OUT V00 RTO OUT V00 Loads the analog signal, which is in binary format and has been loaded from Vmemory location V000 00, into the accumulator. ontact SP is always on. onverts the binary value in the accumulator to a real number. Subtracts the real number stored in location V00 from the real number in the accumulator, and stores the result in the accumulator. V00 is the designated workspace in this example. Multiplies the real number in the accumulator by 0. (the filter factor), and stores the result in the accumulator. This is the filtered value. The filter range is 0. to 0.. Smaller filter factors increase filtering. (.0 eliminates filtering.) dds the real number stored in location V00 to the real number filtered value in the accumulator, and stores the result in the accumulator. opies the value in the accumulator to location V00. onverts the real number in the accumulator to a binary value, and stores the result in the accumulator. Loads the binary number filtered value from the accumulator into location V00 to use in your application or PI loop. L0/0 Option Modules User Manual; th Ed. Rev., 0/

17 hapter : F0-0-, -hannel nalog urrent Input NOTE: e careful not to do a multiple number conversion on a value. For example, if you are using the pointer method in format to get the analog value, it must be converted to binary (IN) as shown below. If you are using the pointer method in inary format, the conversion to binary (IN) instruction is not needed. Using ata Format SP L V000 IN TOR SUR V00 MULR R0. R V00 OUT V00 RTO OUT V0 Loads the analog signal, which is in format and has been loaded from Vmemory location V000, into the accumulator. ontact SP is always on. onverts the value in the accumulator to binary. onverts the binary value in the accumulator to a real number. Subtracts the real number stored in location V00 from the real number in the accumulator, and stores the result in the accumulator. V00 is the designated workspace in this example. Multiplies the real number in the accumulator by 0. (the filter factor), and stores the result in the accumulator. This is the filtered value. The filter range is 0. to 0.. Smaller filter factors increase filtering. (.0 eliminates filtering.) dds the real number stored in location V00 to the real number filtered value in the accumulator, and stores the result in the accumulator. opies the value in the accumulator to location V00. onverts the real number in the accumulator to a binary value, and stores the result in the accumulator. onverts the binary value in the accumulator to a number. Note: The instruction is not needed to PI loop PV (loop PV is a binary number). Loads the number filtered value from the accumulator into location V0 to use in your application or PI loop. 0 L0/0 Option Modules User Manual; th Ed. Rev., 0/

18 hapter : F0-0-, -hannel nalog urrent Input 0 NOTES: L0/0 Option Modules User Manual; th Ed. Rev., 0/