F0-04AD-1 4-Channel Analog Current Input
Contents
1. the module meets your application requirements Input Number of Channels 4 single ended one common Specifications Input Range 0 to 20 mA or 4 to 20 mA current jumper selectable Resolution 12 bit 1 in 4096 for 0 20mA scaled for 4 20mA Step Response 25 0 mS typ to 95 of full step change Input Impedance 125 Ohm 0 1 1 8 W current input Linearity Error End to End 1 count 0 025 of full scale maximum Input Stability Stability 1 count o count e a Scale Calibration Error 10 counts maximum E 20mA current input Offset error not included Offset Calibration Error Calibration Error 5 counts maximum 4mA current 5 counts maximum 4mA current input a E Inaccuracy 4 e a 25 C 77 F 85 0 to 60 C 32 to 140 F Accuracy vs Temperature 80 ppm C maximum full scale calibration including maximum offset change Recommended Fuse external 0 032 A Series 217 fast acting current inputs One count in the specification table is equal to one least significant bit of the analog data value 1 in 4096 General mene 5 to 95 non condensing 10 4 FO 04AD 1 4 Channel Analog Current Input Setting the Module Jumper zk The position of jumper J3 determines the input signal level You can choose between 4 20mA and 0 20mA The module ships with the jumper not connecting the two pins In this position the expected input signal is 4 20mA To select 0 20mA sig2. AD 1 analog module cannot sense the loss of analog input signals in 0 20mA loops See page for information about setting the jumper to select your input type Scale Conversions Scaling the Input Data Many applications call for measure H L ments in engineering units which can be Units A 7695 more meaningful than raw data Convert to engineering units using the formula H High limit of the engineering shown to the right unit range You may have to make adjustments to L Low limit of the engineering the formula depending on the scale you unit range choose for the engineering units A Analog value 0 4095 For example if you wanted to measure pressure PSI from 0 0 to 99 9 then you would have to multiply the analog value by 10 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 Analog Value of 2024 slightly less than half scale should yield 49 4 PSI Example without multiplier Example with multiplier f H L H L Units A 4095 Units 10A 4095 F 100 0 100 0 Units 2024 4095 Units 20240 4095 Units 49 Units 494 Handheld Display Handheld Display V 2001 V 2000 V 2001 V 2000 0000 0049 0000 0494 This value is more accurate 0 F0 04AD 1 4 Channel Analog Current Input 10 15 The Conversion The following example shows how you would write the program to perform the Prog
3. FO O4AD 1 4 Channel Analog Current Input In This Chapter Module Specifications Setting the Module Jumper Connecting and Disconnecting the Field Wiring Wiring Diagram Module Operation Special V memory Locations Using the Pointer in Your Control Program Detecting Input Signal Loss Scale Conversions Special Relays 10 2 FO 04AD 1 4 Channel Analog Current Input Module Specifications K2 5 fe D Ke 5 lt The F0 04AD 1 Analog Input module offers the following features The DLO5 reads all four channels in one scan The removable terminal block makes it possible to remove the module without disconnecting the field wiring Analog inputs can be used as process variables for the 4 PID loops included in the DLO5 CPU Field device burn out is detected on all four channels when 4 20mA range is selected On board active analog ffiltering and RISC like microcontroller provide digital signal processing to maintain precise analog measurements in noisy environments aed ced NOTE The DLO5 CPU s analog feature requires DirectSOFT32 Version 3 0c or later and firmware version 2 1 or later See our website for more information www automationdirect com J F0 04AD 1 4 Channel Analog Current Input 10 3 The following tables provide the specifications for the FO O4AD 1 Analog Input Module Review these specifications to make sure
4. e 4 20mA N cre Transmitter Ww F0 04AD 1 b D CH4 125 ohms NOTE 1 Shields should be grounded at the signal BOEN r 1 source Vv NOTE 2 Connect all external power supply com 18 30VDC OV mons Supply NOTE 3 A Series 217 0 032A fast acting fuse is a recommended for current loops Transmitter Supply Current Loop Manufacturers of transmitters and transducers specify a wide variety of power Transmitter sources for their products Follow the manufacturer s recommendations Impedance In some cases manufacturers specify a minimum loop or load resistance that must be used with the transmitter The FO O4AD 1 provides 125 ohm resistance for each channel If your transmitter requires a load resistance below 125 ohms you do not have to make any changes However if your transmitter requires a load resistance higher than 125 ohms you need to add a resistor in series with the module Consider the following example for a transmitter being operated from a 30 VDC supply with a recommended load resistance of 750 ohms Since the module has a 125 ohm resistor you need to add an additional resistor R Tr Mr R resistor to add R 750 125 Tr Transmitter Requirement e pea Mr Module resistance internal 125 ohms Two wire Transmitter a Module Channel 1 DC Supply R CH1 30V CH1 oV 125 ohms ov 10 6 FO 04AD 1 4 Channel Analog Current Input Module Operati
5. ignal 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 0 F0 04AD 1 4 Channel Analog Current Input 10 7 Special V memory Locations Data Formatting Structure of V7700 Structure of V7701 The DLO5 series has two special V memory locations assigned to the analog input module These V memory locations allow you to e specify the data format binary or BCD e specify the number of channels to scan 4 channels for the F0 04AD 1 e specify the V memory locations to store the input data The table below shows the special V memory locations used by the DLO5 PLC for analog input modules Analog Input Module V memory Locations Data Type and Number of Channels V7700 Storage Pointer V7701 The DLO5 PLC allows the use of bits 8 15 for identifying the number of input channels and the data type binary or BCD The FO 04AD 1 module actually uses only bits 10 and 15 as shown in the diagram below Bit 10 identifies the module asa 4 channel analog input module This bit should be set to 1 for the FO 04AD 1 module Bit 15 is used to distinguish BCD 0 and binary 1 Loading a constant of 0400h into V7700 MSB LSB puts a 1 in bit 10 This identifies a 4 channel analog input modu
6. le in the 1111119876543210 DLO5 option slot and stores the input 543210 data values as BCD numbers Loading a constant of 8400h into V7700 MSB LSB puts a 1 in bit 15 and bit 10 This identi fies a 4 channel analog input module in the DLO5 option slot and stores the in put values as binary numbers 9876543210 o1 AK wo Nh o The DLO5 PLC uses V7701 as a pointer to a V memory location used for storing analog input data The value loaded in V7701 is an octal number identifying the first word in a contiguous range of V memory locations For the FO O4AD 1 module you will identify the first of four V memory locations since it is a 4 channel module For example loading O02000 causes the pointer to write channel 1 s data value to V2000 channel 2 s data value to V2001 channel 3 s data value to V2002 and channel 4 s data value to V2003 You will find an example program that loads appropriate values to V7700 and V7701 on page 10 9 10 8 FO 04AD 1 4 Channel Analog Current Input Analog Data The first twelve bits represent the analog MSB LSB Bits data in binary format Bit Value Bit Value 1 6 64 2 7 128 4 8 256 8 9 512 16 10 1024 32 11 2048 akRWN O Module Since the module has 12 bit resolution 4 20mA Resolution the analog signal is converted into 4096 Ms ws counts ranging fro
7. ls SP01 han ziopuype 020 20 feao SP02 Cran S input ype O 0 20mA feao SP03 Cran inpuype 0z0 20m freo SP610 Cran 1 input open 0 xiter signal open 1 xiter sgral Good SP61 Chan 2input open 0 xiter signal open 1 xiter sgra good SP612 Chan 3 input open 0 xiter signal open 1 xiter sgral good SP613 Chan 4 input open 0 xmiter signal open 1 aminer sonet good 2 5 fe D S Pg
8. ls set to 4 for the FO 01AD 1 The binary format is used for displaying data on some operator interfaces The DLOS5 PLCs support binary math functions OUT Special V memory location assigned to the expansion slot contains the V7700 data format and the number of channels to scan This loads an octal value for the first V memory location that will be used LDA to store the incoming data For example the 02000 entered here would 02000 designate the following addresses Ch1 V2000 Ch2 V2001 Ch3 V2002 Ch 4 V2003 The octal address 02000 is stored here V7701 is assigned to the ex ee pansion slot and acts as a pointer which means the CPU will use the octal value in this location to determine exactly where to store the in coming data 10 10 F0 04AD 1 4 Channel Analog Current Input Detecting Input Signal Loss 2 5 Ke fe D 2 lt Analog Signal Loss The FO 04AD 1 analog module can sense the loss of analog input signals in 4 20mA loops The Special Relays described on page 10 12 allow you to use this feature in your ladder program For example in the rung below SP610 is used to pull in coil Y1 which would be used to open or close an external circuit SP610 v1 The Special Relay SP610 detects our a loss of input signal to channel 1 I E Use SP610 to trigger an alarm or shut down a machine NOTE The FO 04
9. m 0 4095 212 For aunt example a 4mA signal would be 0 anda 20mA signal would be 4095 This is dx equivalent to a binary value of 0000 0000 0000 to 1111 1111 1111 or 0 4095 000 to FFF hexadecimal The diagram to H L the right shows how this relates to the 4095 signal range H high limit of the signal range Each count can also be expressed in terms of the signal level by using the equation shown Resolution L low limit of the signal range 16mA 4095 3 907 A per count 2 5 fe D S Pg Q F0 04AD 1 4 Channel Analog Current Input 10 9 Using the Pointer in Your Control Program Using the program below the CPU examines the pointer values the beginning memory location identified in V7701 on the first scan only The example program below shows how to setup these locations Place this rung 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 V2000 is used in the example but you can use any user V memory location SPO LD LD ie K0400 ae K 8400 Loads a constant that specifies the number of channels to scan and the data format The upper byte selects the data format i e O BCD 8 Binary and the number of channe
10. nals use the jumper to cover both pins OOOCO0CO The default jumper setting se UOHI lects a 4 20mA signal source The default jumper setting doesnot connectthe two pins HHHHHHHHHHHHI HHHH AsO oz r WARNING Before removing the analog module or the terminal block on the face of the module disconnect power to the PLC and all field devices Failure to disconnect power can result in damage to the PLC and or field devices Connecting and Disconnecting the Field Wiring Wiring Guidelines Your company may have guidelines for wiring and cable installation If so you 2 5 e D 2 lt should check those before you begin the installation Here are some general things to consider e Use the shortest wiring route whenever possible e Use shielded wiring and ground the shield at the transmitter source Do not ground the shield at both the module and the source e Do not run the signal wiring next to large motors high current switches or transformers This may cause noise problems e 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 The FO 04AD 1 does not supply power to field devices You will need to power transmitters separately from the PLC To remove the terminal block disconnect power
11. on 2 5 Ke fe D 2 lt Channel Scanning The DLO5 reads all four channels of input data during each scan The CPU supports special V memory locations that are used to manage the data transfer This is Sequence with a discussed in more detail in the section on Writing the Control Program DLO5 Analog Module Updates Scan oe DLO5 PLC Read Inputs y Execute Application Program Read the data Scan N lt Ch 1 2 3 4 H Scan N 1 Ch1 2 3 4 lt _ Store data Scan N 2 Ch 1 2 3 4 H K Scan N 3 lt Ch 1 2 3 4 y Scan N 4 Ch 1 2 3 4 Write to Outputs Even though the channel updates to the CPU are synchronous with the CPU scan the module asynchronously monitors the analog transmitter signals and converts each signal into 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 The module takes approximately 25 milliseconds to sense 95 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 s
12. ram engineering unit conversion This example assumes you have BCD data loaded into the appropriate V memory locations using instructions that apply for the model of CPU you are using Note this example uses SP1 which is always on You could also use an X C etc permissive contact i LD When SP1 is on load channel 1 data to the accumulator V2000 MUL Multiply the accumulator by 1000 to start the conversion K1000 DIV Divide the accumulator by 4095 K4095 OUT Store the result in V2010 V2010 Analog and Sometimes it is useful to convert between the signal levels and the digital values Digital Value This is especially helpful during machine startup or troubleshooting The following Conversions table provides formulas to make this conversion easier If you know the digital value If you know the analog signal level 4 to 20mA 16D a 0 to 20mA 20D 4095 4095 20 For example if you have measured the 4095 A 4 signal as 10mA you can use the formula 16 to determine the digital value that will be D 4095 10mA 4 stored in the V memory location that 16 contains the data D 255 93 6 D 1536 10 12 FO 04AD 1 4 Channel Analog Current Input Special Relays The list of other Special Relays associated with the DLO5 PLC is contained in the DLO5 User Manual The following special relays are new and relate to the status of the FO 04AD 1 module or one of its input channe
13. to the PLC and the field devices Pull the terminal block firmly until the connector separates from the module You can remove the analog module from the PLC by folding out the retaining tabs at the top and bottom of the module As the retaining tabs pivot upward and outward the module s connector is lifted out of the DLO5 socket Once the connector is free you can lift the module out of its slot 0 F0 04AD 1 4 Channel Analog Current Input 10 5 Wiring Diagram Use the following diagram to connect the field wiring If necessary the F0 04AD 1 terminal block can be removed to make removal of the module possible without disturbing field wiring See NOTE 1 Typical User Wiring Internal Module Wiring B Analog Input a y 4 CHANNELS 0 20m sone Nn oxen 4 20mA CH1 Transmitter N pi WW PWR CH1 RUN A ry f 125 ohms c u awe hA ay 1 S5lTtxi EROMAS ae ODER z J RX1 ransmitter 2 CH2 T Fe amp eae 2 z TX2 CH3 2 5 RX2 2 wire aa ay ots 3 2 2 z 3 gt Transmitter pi t 4 W 0 9 i CH3 125 ohms H o ona N A E 9 wir
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