Field Control, Current/Voltage Source Analog Output Module
Contents
1. LED An LED visible through the transparent portion of the module top indicates whether field and backplane power are present Field Control Distributed I O and Control System I O Modules User s Manual 3 1 GFK 0826G 2 Analog Output Module o Current Voltage Source Analog Output Module une Host Interface The Current Source Analog Output Module has 4 words 8 bytes of analog output data A Bus Interface Unit is required to provide this output data to the host and or local processor The module converts analog values from the host or local processor into output current Scaling for the module is performed by the Bus Interface Unit Software Range Selection of 0 to 20mA and 4 to 20mA is available on a per channel basis Using the 0 to 20 mA range requires the installation of an external wire jumper between JMP and RET The default scaling for this module is Eng Lo 0 Eng Hi 20 000 Int Lo 0 IntHi 20 000 The default range is 0 to 20mA The module is shipped with no wire jumper present The jumper must be installed to correspond to the module s default range and scaling The 4 20mA range provides a fixed 4 milliamp offset 0mA 4mA signal with a 16m A signal span The 4mA offset remains as long as analog loop power is applied even if the logic power is off Note that default outputs for loss of host communications require both backplane power and analog field power A second output on each channel provides an2. and B2 are electrically connected together 46527 Field Control Distributed I O and Control System I O Modules User s Manual 3 7 GFK 0826G
3. loop supply and return The current driver is a sourcing type The low side of a load can be connected to RET the negative side of a 24 V loop supply or a more negative point that can be up to 36 volts negative with respect to the module 24 volt supply positive terminal Voltage output is relative to RET terminal which is common to all circuits The module s 10 ohm resistor helps reduce ground loop circulating currents The operating range for an output can be changed to 0 20 mA 0 12 5 volt by connecting the JMP terminal to the RET terminal for that output as illustrated above and on page NO TAG of this datasheet The module contains MOV transient voltage suppressors and RF bypass capacitors to the module chassis The chassis point is connected to the module case and the chassis ground terminal on the module base This should be grounded for best noise immunity Outputs default to minimum value upon initial powerup or loss of backplane power 3 4 Field Control Distributed I O and Control System I O Modules User s Manual GFK 0826G Analog Output Module Current Voltage Source Analog Output Module Module Specifications 5 GFK 0892H June 1997 Module Characteristics Linearity all ranges z outputs 1LSBresolution value Powersupply range 20 to 29 volts DC 5 maximum ripple 24V Power input current Standby no output 80mA typical Operating 180 mA including loop current maximum Modulepowerd
4. points are usually preferred although an Auxiliary Terminal Block can be used Auxiliary Terminal Blocks have all terminals connected together internally The Auxiliary Terminal Block with box terminals has 13 terminals each of which accommodates one AWG 14 avg 2 1mm cross section to AWG 22 avg 0 36mm cross section wire or two wires up to AWG 18 avg 0 86mm cross section The Auxiliary Terminal Block with barrier terminals has nine terminals each of which can accommodate one or two wires up to AWG 14 avg 2 1mm cross section The Panel Ground Shield from the Auxiliary Terminal Block to the panel should be AWG 14 wire not longer than 4 inches 10cm 1 O Terminal Block with VO Terminal Block with 1 O Terminal Block with Wire to Box Terminals Barrier Terminals Board Connectors IC670CHS002 or 102 IC670CHS001 or 101 IC670CHS003 or 103 RET 4 16 EBENE MP4 15 14 oline AH va RET4 El 14 JMP4 14 RET3 A 13 v4 a JMP3 Ho ll fe RETS 127 13 ommon RET2 a O aa JMP2 Te Yo RET2 8 H rer Mea JMP2 6 JMP 1 2113 11 RET1 2 5 V2 Common WS Vi 31 DC MES Common JMP 1 2 gt DC Wr DC DC 11 Vi EZ AM DC All DC Terminals El E2 E4 E6 and E8 are electrically connected togethe Al and A2 are electrically connected together B1
5. uncalibrated voltage output The 4 to 20mA range corresponds to 0 to 10 volts The 0 to 20 mA range corresponds to 0 to 12 5 volts A wire jumper is required for the 0 to 20mA range Both voltage ranges have restricted load current drive capability above 10 volts Voltage can be used alone or simultaneously with current to drive meters or voltage input devices An OPEN WIRE diagnostic available per channel operates only on the current outputs If you are using only the voltage output of a channel you should either disable the fault or connect a dummy load of 250 to 800 ohms across the current terminals of the channel An OPEN WIRE fault will not affect the operation of the voltage output Output register values outside the capability of the module will drive the output to the appropriate minimum or maximum level but will not generate a diagnostic fault Keying Locations Optional keying locations for the Current Source Analog Output Module are KeyingLocations A B C D E F G H J K Y yv 3 2 Field Control Distributed I O and Control System I O Modules User s Manual GFK 0826G Analog Output Module 3 Current Voltage Source Analog Output Module ae une Scaling The Int units on the HHM configuration screen correspond to actual desired output current values in microamps provided the base terminal jumper corresponds to the module range configuration The Int unit values set in the c
6. 160 microamps to yield voltage in step 2 Internal hi 20000 microamps to yield voltage in step 4 7 The voltage output is now calibrated to your meter within the approximately 3 millivolt resolution of the output Use the new Eng Hi and Eng Lo values as calibration points when repeating or go back to step 1 and begin again The scaling affects both the voltage and current forms of the output point so only one can be recalibrated Field Control Distributed I O and Control System I O Modules User s Manual 3 3 GFK 0826G 4 Analog Output Module e Current Voltage Source Analog Output Module une Module Operation Four D A converters provide simultaneous current and voltage outputs from each output channel Current output spans are 0 20 or 4 20 mA voltage spans are 0 10 or 0 12 5 volts All outputs are isolated from ground and logic but are grouped on a common power supply Outputs can be isolated as a group from the rest of the system if a separate isolated loop supply is used 46430 A e e j e To Other Circuits ZN BEN Terminals 001nF l TB e ety DtoA EMI Filter 7 Converter O EMI Filter JMP MOV 30V RET B e 10 Ohms ru ie 001nF To Other Circuits Base I GND 177 Chassis Each circuit provides simultaneous voltage and current outputs from the digital to analog converter All circuits share a common
7. 30 supply voltage Maximum load can be increased to 800 ohms if min supply voltage is greater than 23 0 volts including ripple note 3 Open wire occurs when there is insufficient compliance voltage to drive output to commanded value Therefore occurrence of open wire depends on combination of output load and current The open wire warning may occur continuously on a disconnected output such as not used or voltage used instead note 4 In the presence of severe RF interference IEC 801 3 10V m accuracy may be degraded to 1mA or 0 5V Field Control Distributed I O and Control System I O Modules User s Manual 3 5 GFK 0826G 6 Analog Output Module a Current Voltage Source Analog Output Module une Field Wiring The following illustration shows typical connections for this module m Ge Ret Isolated Current 2 2 a Common E Load 4 20mA o y Terminals or Twisted Pair Auxiliary Terminal Block Ret Isolated Current Jmp a 2 Load 0 20mA e Twisted Pair 9 nn Ret 9 Isolated Voltage G Bad Jmp 2 Load 0 10 Volts ae 4 max Twisted Pair gt Local Panel Gnd 4 Fr Ret Differential Voltage mO O ump Load 0 10 Volts I Triad y Local Loop Optional L plop Power Supply Power E Supply 0 A 46431 Ground Instrumentation grade shielded twisted pair or 3 wire twisted triad wire should be used for best noise immu
8. CIMTECAR AUTOMATION ENGINEERING SOLUTIONS This Datasheet for the IC670ALG320 Analog Output Current Voltage 4 Pt Grouped http www cimtecautomation com parts p 14494 ic670alg320 aspx Provides the wiring diagrams and installation guidelines for this GE Field Control module For further information please contact Cimtec Technical Support at 1 866 599 6507 sales cimtecautomation com Analog Output Module IC670ALG320 GFK 0892H Current Voltage Source Analog Output Module June 1997 The Analog Output Module IC670ALG320 provides a group of four current voltageanalog outputs Each output channel provides a span of 4 20mA and 0 10V which can be changed to 0 20mA and 0 12 5 volts by adding jumper on the I O Terminal Block Default scaling is 0 to 20 000 Scaling can be changed in configuration to match the output used or to engineering units 46429 CURRENTSOURCE x ANALOG OUTPUT 24 VDC 20 5mA MAX LOTS XVW VWS 02 OCA vz INd LNO DOTWNV 308N0S IN3YENO x Wd Power Sources The same 24 volt power supply used for the Bus Interface Unit can provide loop power to the outputs in most cases If module to module or Bus Interface Unit isolation is required separate power supply s must be used The most common application would have the loop supply local at the module driving multiple isolated transducers isolated analog inputs or differential analog inputs
9. issipation 1 5 Watts minimum 4 3 Wattsmaximum Temperaturecoefficient 002 of value per degree C typical 005 of value per degree C maximum Isolation to ground and logic 1500 VAC for 1 minute 250 VAC continuous Input or channel to channel common mode None single ended grouped out Current Drawn from BIU Power Supply 51mA maximum Output Characteristics Currentload impedance Open wire current only Over range Output error current note 5 DigitalResolution 12bits typical Current Analog Resolution LSB current 4 20 range 4 0microAmps typical 0 20 range 5 0microAmps typical Output current range JMP open 4mA minimum 20mA maximum JMP to RET 05 mA minimum 20mA maximum note 1 0 Ohms minimum 600 Ohms maximum note 2 800 load Ohms minimum note 3 20 000 mA minimum 20 500 mA maximum 20uA 0 1 of value maximum Voltage Analog Resolution LSB voltage 0 10 0 12 5 Output voltage range JMP open JMP to RET Voltageload impedance Output error voltage note 5 2 5mV typical 3 125mVtypical 02 Volts minimum 10 Volts maximum note 1 02 Volts minimum 12 5 Voltsmaximum 2K Ohms minimum for 10V output 5 K for 12 5V output 10mVC 0 25 of value maximum note 1 May limit or become non linear below minimum values given due to saturation of output drivers note 2 Minimum load should be 250 ohms if ambient exceeds 50 C Valid over rated 18
10. nity The shield should be terminated at a local panel ground near the module The module local loop supply may be either floating or grounded and may be shared with other similar functions All loads have a common return bus RET available at the module for the negative side of the loads This is internally connected through a 10 Ohm buffer resistor to the supply negative side B terminal Normally only ungrounded loads are recommended If a grounded load must be driven a circulating ground loop current may be set up between the load and ungrounded module supply This may reduce accuracy The internal resistance lessens the effect for small ground voltage differences CAUTION The module may be damaged if high ground voltage differences occur due to miswiring or high power surges Ordinarily no additional wiring to the RET bus is needed However if a low impedance ground is required to all devices the proper way is to jumper any RET terminal to the power B terminal at the module and ground the Loop supply externally 3 6 Field Control Distributed I O and Control System I O Modules User s Manual GFK 0826G Analog Output Module 7 Current Voltage Source Analog Output Module ae une If the module is installed on an 1 0 Terminal Block with Box Terminals or Barrier Terminals an Auxiliary Terminal Block may be used to provide additional wiring terminals For the I O Terminal Block with Wire to Board Connectors external connection
11. onfiguration must be within the limits of the range used The module will operate with a range jumper mismatch but Int units scaling will be invalid The Eng units are the values supplied by the host Field Recalibration Using Scaling Field recalibration can be accomplished by forcing the outputs to the Eng Hi and or Eng Lo calibration point values in the module configuration reading the actual output produced and updating the configured values to the actual values Usually recalibrating the high point only is sufficient If the low point is done it should be changed from the default value of 0 volts or 4000 microAmps to get better accuracy The following example shows a two point calibration for 0 to 10 volts 1 Set the analog output scaling for 0 to 10 volts output Eng lo 100 mV Eng hi 10 000 mV Internal lo 4 160 corresponds to 100 mV Internal hi 20 000 corresponds to 100 mV 2 Force the output to the low point value 100 0 100 volt 3 Read the output using an accurate meter on the output For example you might get a value of 0 107 volts instead of 100 4 Force the output to the high point value 10000 10 000 volts 5 Read the output using an accurate meter on the output For example you might get a value of 9 985 volts instead of 10 000 volts 6 Change the scaling to the new calibrated values Eng lo 107 reading in mv from step 3 Eng hi 9985 reading in mv from step 5 Internal lo 4
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