ersaPoint RTD Analog Input Module IC220ALG620, GFK-2013
Contents
1. A Channel 1 4 wire sensor B Channel 2 2 wire sensor Terminal Signal Assignment Te Constant current supply wigasurlng mpu sensor 1 a RTD sensor 2 Constant current supply Shield connection ch 1 and 2 Oe 12 W o 13 U 21 U Measuring input sensor z 4424 8 GFK 2013 Internal Circuit Diagram 24 V Ug 24 V Uy L A Protocol chip bus logic including voltage conditioning Optocoupler DC DC converter with electrical isolation Microprocessor with multiplexer and GWA analog digital converter Reference voltage REF Electrically erasable programmable read only memory gt l Amplifier VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 January 2004 Electrical Isolation Local bus IN mm Bus interface ma Local bus OUT LK OPC E U 7 5V DC EE m U 7 5 V DC mm U 24 V DC I i A VO interface and microprocessor Electrical isolation between area A and B Usna 24 V OC mE n H I Ground potential Analog inputs Programming Data Length code 02 hex Input address area 4 bytes Output address area 4 bytes Parameter channel PCP 0 bytes Register length bus 4 bytes VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Output Data Words for Channel Configuration The module receives two output data words These da2. 1500 Resolution for sensor type resolution depends on setting for o JO 10hm a below So Sensor type value in bits 3 O is 15 Resolution is O1deg C 1 0 1Ohm 1Ohm 1 12 bit resolution with 3 diagnostic bits 2 Standardized Format 15 bit resolution no diagnostics 3 Reserved 3 0 Sensor type Pt DIN Default Pt SAMA Ni DIN Ni SAMA Cu10 Cu50 Cu53 7 Ni 1000 L amp G Ni 500 Viessmann KTY 81 110 10 KTY 84 11712 Reserved 1100 13 Potentiometer Linear R 0 through 400 Ohms 15 Linear R 0 through 4000 Ohms gt VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Process Data Input Words The measured input values are transmitted per channel to the controller The figure below shows the sequence of the input data words Channel 1 Channel 2 2 bytes 2 bytes For each channel the format of the input data can be independently configured in three input data formats as shown below and on the following pages Default Input Data Format Signed 15 Bit Resolution with Extended Diagnostics This format can be selected for each channel using bits 5 and 4 bit combination 0 0 of the corresponding process data output word In the input data bit 15 can be used as a sign bit bits 14 to 0 contain the analog value pis ufaialutolets irzte6 s atsafte tifo Analog Value Channel Error Codes The default format s
3. 2013 January 2004 Measuring Ranges for Temperature Sensors The module s measuring range for temperature sensors depends on the configured resolution The resolution chosen should be appropriate for the expected temperature range of the sensors as shown in the bottom table Resolution Measuring Range 0 1 degree C 273 degrees C to 3276 8 degrees C 0 01 degree C 273 degrees C to 327 68 degrees C 0 1 degree F 459 degrees F to 3276 8 degrees F 0 01 degree F 459 degrees F to 327 68 degrees F To convert Celsius measurements to Fahrenheit the following formula can be used in the application Degrees F Degrees C x 9 5 32 Input Measuring Ranges The ranges shown below are supported for the different types of configurable input measurements If the input data format being used see previous pages supports diagnostics input measurements that are outside the low and high limits are reported as under range or over range Sensor Type Low Limit High Limit 606 T6F Ni Ro 10Q to 30002 SAMA 60C 76F 50C SBF 500 58F 50C SEF 160 1320F Ni 500 Viessmann 60C 76F 250C 482F KTY 81 110 55C 67F 150C 302F e a 400 maximum Linear Resistance 0 through 4000 Ohms 10 VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Measuring Errors When measuring temperatures with resistance 3 Wire Sensor Measurement Errors thermometers measu
4. To keep the current flowing through the potential jumpers of the analog modules as low as possible a separate main circuit should be used for analog modules If analog modules must be used in a main circuit together with other modules place the analog modules to the right of the standard modules at the end of the main circuit During installation ensure that no isolating voltage is specified between the analog inputs and the bus Provide signals with safe isolation for the thermistor detection if required Example 2 Wire and 3 Wire Sensors A Channel 1 2 wire sensor B Channel 2 3 wire sensor Terminal Signal Assignment Constant current supply U1 Measuring input sensor 1 saa 12 Constant current supply U2 Measuring nat sensor 14 24 Shield Shield connection ch 1 and 2 January 2004 Connections Always connect temperature shunts using shielded twisted pair cables Connect the shield at the module using the shield connector clamp The clamp connects the shield directly to FE on the terminal side Additional wiring is not necessary Isolate the shield at the sensor A 4 wire sensor can only be connected to channel 1 only one 4 wire sensor can be connected to the module LED Color Meaning Example 4 Wire and 2 Wire Sensors
5. OE TTN OS RE S O SE MEENE EN D E Fis 1000 100 0 Faro 10000 10000 8080 underrange underrange 8002 shortcircuit shortcirouit l VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Standardized Input Data Format 15 Bit Resolution No Diagnostics This format can be selected for each channel using bits 5 and 4 bit combination 1 0 of the corresponding process data output word In this format the measured value is represented in bits 14 to 0 Bit 15 is available as a sign bit p15 14 fisfa ujo ets 7 e s a s 2ir1jo Analog Value Significant Measured Values in Standardized Representation Format The table below shows typical hexadecimal and corresponding decimal values in Standardized Representation format Values are shown for the different combinations of configured sensor type and resolution Typical Input RTD inputs Linear R Values 0 4000 Ohms Decimal 0 1 deg resolution 0 01 dec resolution 1 Ohm resolution 0 1 Ohm resolution 7FFF 32767 e gt 2048 gt 4096 Upper limit value over range over range 1 LSB 7D00 32000 3 320 00 2000 4000 2710 10000 1000 0 100 0 1250 oooa 10 141 0 625 Lo a 0000 Fes 1000 1000 e T o S o p8Fo 10000 tf S o lower limit value under range under range 1 LSB lower limit value open sho
6. VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Module IC220ALG620 provides two input channels for Module Specifications resistive temperature sensors It supports platinum or nickel l l sensors according to the DIN standard and SAMA Directive Housing dimensions 12 2mm x 120mm x 66 6mm In addition CU10 CU50 CU53 KTY81 and KTY84 sensors width X height X depth 0 480in x 4 724in x 2 622in are supported 2 3 and 4 wire 25 C to 55 C 13 F to 131 F 25 C to 85 C 13 F to 185 F 75 on average Take appropriate measures against increased humidity gt 85 Class of protection Class 3 according to VDE 0106 IEC 60536 Power Consumption Communications power 7 5V Module with the I O Terminal Strip plugged in Module IC220ALG620 requires one 1 I O Terminal Strip IC220TBK061 ordered separately See the ordering information below Features Two inputs for resistive temperature sensors Configuration of the independent channels Three data formats Connection of 2 3 and 4 wire sensors Ordering Information IC220ALG620 Analog In 16 Bit RTD 2 Channels IC220TBKO61 I O Terminal Strip with Shield qty 5 VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 Installation Instructions High current flowing through the segment and main power busses raises the temperature of the components within the module
7. ble diameter in mm 0 0043 1 K Temperature coefficient for copper Tu Ambient cable temperature in deg C Because there are two cable resistances in the measuring system forward and return the value must be doubled The absolute measuring error in Kelvin K is provided for platinum sensors according to DIN using the average temperature coefficient o 0 385Q K for PT 100 a 3 85Q K for PT1000 VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Tolerance and Temperature Response Typical Measuring Tolerances at 25C 77F aat 100C 2 Wire Sensors 3 Wire Sensors 4 Wire Sensors 212F Relative Absolute Relative Absolute Relative Absolute Temperature Sensors Ni 500 2 8Q K 0 17 X 0 43K X 0 17 0 43K 0 14 0 36K Viessmann KTY 81 110 10 7Q K_ 0 07 X 0 11K X 0 07 0 11K 0 06 0 09K Linear resistance Average sensitivity for the calculation of tolerance values x Additional error due to connection for 2 wire sensors Maximum Measuring Tolerances at 25C 77F aat 100C 2 Wire Sensors 3 Wire Sensors 4 Wire Sensors 212F Relative Absolute Relative Absolute Relative Absolute Temperature Sensors PT 100 1 0 83K PT 1000 14 04 K Ni 100 1 0 52K Ni 1000 1 0 65K Cu 60 1 0 75K Ni 1000 L amp G 10 71K Ni 500 2 8Q K 0 72 X 1 799K X 0 72 1 79 K_ 0 57 1 43K Viessmann Lin
8. ear resistance Average sensitivity for the calculation of tolerance values x Additional error due to connection for 2 wire sensors Temperature Response at 25C to 55C 13F to 131F For 2 3 and 4 wire sensors Typical 12ppm degree C Maximum 45ppm degree C 13 VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Technical Data Analog Inputs Conversion time of the A D converter 120us typical Process data update Depends on connection method Both channels with 2 wire sensors 20mS One channel with 2 wire sensor and 20mS one channel with 4 wire sensor Both channels with 3 wire sensors 32mS Safety Devices None Electrical Isolation To provide electrical isolation between the logic level and the I O area it is necessary to supply the bus module and the sensors using a power terminal from separate power supplies Interconnection of power supply units in the 24V range is not allowed For detailed information refer to the N U User s Manual Common potentials 24V main power 24V segment voltage and GND have the same potential FE functional earth ground is a separate potential area Isolated Voltages in the RTD Module Test distance Test voltage 7 5V supply bus logic 24V supply analog I O SOOVAC 50Hz 1min 7 5V supply bus logic functional earth ground SOOVAC 50Hz 1min 24V supply analog I O functional earth ground SOOVAC 50Hz 1mi
9. n Error Messages to the Control System Breakdown of the internal voltage supply Failure or dropping of communications Yes I O error message to the NIU module voltage Error Messages via Process Data VO error user error
10. ring errors may cause incorrect 3 wire sensors provide measurements that are nearly as results l i precise as measurements taken with 4 wire sensors 4 Wire Sensor Measurement Errors However 3 wire sensors are more vulnerable to 4 wire sensors provide the most precise measurements interference in noisy environments A constant current is sent through the sensor via the I and l cables Two additional cables U and U can be used to tap and measure the temperature related voltage at the sensor The cable resistances have no effect on the measurement OO Q With 3 wire sensors the effect of cable resistance on the measurements in the module is eliminated or minimized by multiple measuring of the temperature related voltage and corresponding calculations 11 VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 2 Wire Sensor Measurement Errors 2 wire sensors provide cost effective connections The U and U cable connections are not used The temperature related voltage is not directly measured at the sensor so it is not affected by cable resistances R Measurement errors can occur with 2 wire sensors as a result of cable resistance The following examples describe the impact of various installation factors on measurement accuracy In each example measurement error was found for PT 100 sensor copper cable y 57m Qmm temperature 25 degrees C 77F In all case
11. rt circuit open short circuit 2 LSB VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 12 Bit Input Data with Diagnostics This format can be selected for each channel using bits 5 and 4 bit combination 0 1 of the corresponding process data output word The measured value is represented in input bits 14 through 3 Input bit 15 is the sign bit Bit 1 indicates open circuit short circuit For an open circuit or short circuit bit 1 is set to 1 Bit O indicates an over range condition If the measured value is outside the representation area of the process data bit O is set to 1 ps iit ujol ests 7 e si a si2i1 o_ psin Analog Value 0 OR Significant Measured Values in 12 Bit Resolution Format The table below compares typical hexadecimal and corresponding decimal values in 12 bit resolution format Typical Input Values RTD inputs Decimal 0 1 deg resolution 0 01 deg resolution XXXX XXXX XXXX XXX1 pin Over range Positive value as shown in the table on next page 2710 10000 1000 0 100 0 03E8 1000 100 0 10 00 0008 a T T 0000 O a O C o FFF8 8a o y y ow FC18 1000 100 0 10 00 XXXX XXXX XXXX XXX1 pin Under range Negative value as shown in the table on next page XXXX XXXX XXXX XX1 Xpin Open circuit short circuit Negative value as shown in the table on next page VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK
12. s using PT 1000 sensors would improve measurement accuracy by ten times over the PT 100 sensor due to the higher temperature coefficient of the PT 1000 sensor PT 100 a 0 385Q K PT 1000 a 3 85 Q K Resistance increases with cable length so cables should be kept as short as possible when using 2 wire sensors The diagram below compares the increase in temperature measurement error AT with the increase in cable length for cables of three different diameters 5 50 75 10 0 12 5 15 0 17 5 m 20 0 I 1 Diameter 0 14mm AWG 26 2 Diameter 0 25mm AWG 24 3 Diameter 0 50mm AWG 20 12 January 2004 Measurement accuracy also increases as cable diameter increases Using cables with a diameter less than 0 5mm 20AW6G greatly increases measurement errors 0 01 02 03 04 05 06 07 08 0 9m1 0 gt Finally higher ambient temperature also increases cable resistance However the impact is slight 25 K 30 20 10 O 10 20 30 40 50 C 60 Ty Calculating Cable Resistance Cable resistance can be calculated using the following equation 1 R Roy xX 1 0 0043 m X Ty R 1 0 0043 i Ty X i xX YXA Koo Where Ri Cable resistance in Ohms R120 Resistance at 20 deg C 68F in Ohms Cable length in m x Specific electrical resistance of copper in Qmm m A Ca
13. ta words can be used to configure the module The module s default configuration can be used without change or each channel can be configured independently This configuration setting is not saved and must be transmitted in each logic scan Default channel configuration Connection type 3 wire sensors Reference resistance 100 Ohms Resolution 0 1 degree C Sensor type PT 100 DIN Data format Extended diagnostics mode The following parameters can be configured Sensor connection type 2 wire 3 wire or 4 wire Value of the reference resistance Resolution Format for representing the measured values Sensor type Only channel 1 can be configured for a 4 wire sensor If that is done channel 2 can only be used for a 2 wire sensor Configuration Diagnostics In the default format the following configuration errors are indicated by an error code If the data format is changed extended diagnostics are not available After powerup the message measured value invalid error code 8004 hex appears in the input data After 1 second maximum the preset configuration is accepted and the first measured value is available If the channel configuration is changed the corresponding channel is re initialized The message measured value invalid error code 8004 hex appears in the input data for 100mS maximum f the configuration is invalid the message Configuration invalid appears error code 8010 he
14. upports extended diagnostics Values greater than 8000H indicate an error Decimal Error 8001 32767 8002 32766 Open circuit or short circuit available only in the temperature range Open Circuit Short Circuit Detection Open circuit is detected according to the conditions listed below Yes open circuit short circuit is detected the cable is not connected for this type No open circuit short circuit is not detected because the measured value is valid Faulty Sensor Temperature measuring Range Resistance Measuring range Cable VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 Significant Measured Values in the Default Data Format The table below shows typical hexadecimal and corresponding decimal values in the default data format Values are shown for the different combinations of configured sensor type and resolution Typical Input RTD inputs Potentiometer Linear R Linear R VETTES 0 400 Ohms 0 4000 Ohms Decimal 0 1 degree 0 01 degree 1 0 1 0 1 Ohm 0 010hm 10Ohm 0 1 Ohm resolution resolution resolution resolution resolution resolution resolution resolution 8002 opencircuit opencirouit J l l Over range 2710 10000 1000 0 100 00 1000 0 100 00 1000 0 10x Ro 40x Ro 03E8 4000 10 00 h 100 0 EA 10 00 100 0 1x Ro 00A0 10 1 0 10 0 1 0 10 ria 0001 0 1 oono REDE 0 o o 0o po o o o N ROE DNC T DA O
15. x Process Data Output Format Each channel has one process data output word associated with it You must set bit 15 of the corresponding output word to 1 to reconfigure the channel If bit 15 0 the default configuration is used Bit 14 should always be set to 0 Process data word 0 Process data word 1 Channel 1 Channel 2 Sressessea PA eeeses venesse tesasees terenon ttesessa vesse tonsasesesa beesrses Peery Aes eesee ere AOC er ewemeecses theses oe memeies eee trenone eeteane teresane eee te eeesens oo mes esos asees tonene MSB LSB l l Configuration Connection RO Resolution Format Sensor type type VersaPoint I O Module Analog In 16 Bit RTD 2 Channels IC220ALG620 GFK 2013 January 2004 To configure a channel set bit 15 of that output word to 1 If bit 15 is zero the preset configuration is active Bit Assignment Decimal Binary Description Configuration Default configuration 14 Must be zero 13 12 Connection type reserved 0 Must be zero o0 o0 3 wire Default 3 J1 esenved S 11 8 Reference O 0000 100 Ohms Default resistance in 1 0001 10 Ohms Ro 2 0070 3 fon 3 0101 120 Go N 0l amp 0 Defaultconfiguration O Change configuration data fe ns 2 wire if channel 1 is 4 wire channel 2 must be 2 wire 4 wire Channel 1 only a 0700 S M0 e 0770 T 0111 200 e s po pao SSS o 1007 300 500
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