copyright 2003 by siemens ag a5e00236204-01 product information on the manual edition 08.2003 S7-300 module specifications, edition 11/2002, (a5e00105505-02) introduction the S7-300 product family has been enhanced and improved. this document contains details of the features and technical specifications of the modules. contents section contents page 1 analog input module sm 331; ai 8 x 13 bit; (6es7 331-1kf01-0ab0) 2 2 parameters of the sm 331; ai 8 x 13 bit 6 3 measuring methods of the sm 331; ai 8 x 13 bit 7 4 parameters of the sm 331; ai 8 x 13 bit 8
2 product information on the manual S7-300 module specifications, edition 11/2002, (a5e00105505-02) a5e00236204-01 1 sm 331 analog input module; ai 8 13 bit; (6es7 331-1kf01-0ab0) order number 6es7 331-1kf01-0ab0 characteristics the sm 331; ai 8 13 bit has the following features: 8 inputs measured-value resolution 12 bits + sign measuring method selectable: ? voltage ? current ? resistance ? thermal resistance isolated against the backplane bus interface
3 product information on the manual S7-300 module specifications, edition 1 1/2002, (a5e00105505-02) a5e00236204-01 terminal assignment and block diagram of the sm 331; ai 8 13 bit on channels 4 to 7 in the figure below you will find a number of connection examples for the different measuring methods. these connection examples can be applied in the same way to all channels (channels 0 to 7). s ? 2 20 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 22 40 21 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 channel number 2 1 3 4 5 6 7 0 2 1 3 4 5 6 7 0 2 1 3 4 5 6 7 0 2 1 3 4 5 6 7 0 logic circuitry and backplane bus interface module adc isolation internal supply current source + 5 v from backplane bus ch 0 ch 1 ch 2 ch 3 m+ connection examples multiplexer ch 4 ch 5 ch 6 ch 7 m ? m ? m+ m ? i+ m ? u+ a mv v i+ m+ s ? u+ s ? m+ u+ i+ s ? u+ i+ m+ m ? m ? m+ i+ m ? u+ i+ m+ s ? u+ s ? m+ u+ i+ s ? u+ i+ s ? m ? figure 1 module view and block diagram of the sm 331; ai 8 13 bit note when connecting voltage and current sensors, ensure that the maximum permissible common mode voltage u cm of 2 v is not exceeded between the inputs. to prevent incorrect measurements being made, you should therefore connect the different m ? connections to each other. when measuring resistances and resistance thermometers, the m ? connections do not have to be interconnected.
4 product information on the manual S7-300 module specifications, edition 11/2002, (a5e00105505-02) a5e00236204-01 technical specifications of the sm 331; ai 8 13 bit dimensions and w eight dimensions w h d (in millimeters) 40 125 117 weight approx. 250 g data for specific modules supports clocked operation no number of inputs for resistance-type sensor 8 8 length of cable shielded max. 200 m max. 50 m at 50 mv voltages, currents, potentials constant current for resistance-type sensor resistance thermometer and resistance measurement 0 ... 600 ? 0.83 ma resistance measurement 0 ... 6 k ? 0.25 ma isolation between channels and backplane bus yes between the channels no permitted potential dif ference between the inputs (ecm) 2.0 vdc between the inputs and m internal (u iso ) 75 vdc / 60 vac insulation tested with 500 vdc current consumption from the backplane bus max. 90 ma power dissipation of the module typ. 0.4 w analog value generation measuring principle integrative integration time/conversion time/resolution (per channel) parameters can be assigned yes suppression of interference voltage for interference frequency f1 in hz 50 60 integration time in milliseconds 60 50 basic conversion time incl. integration time in ms 66 55 additional conversion time for resistance measurement in ms 66 55 resolution in bits (incl. overrange) 13 bits 13 bits suppression of interference, limits of error interference voltage suppression for f = n (f1 1 %), (f1 = interference frequency) n = 1.2 common-mode interference (u cm < 2 v) > 86 db series-mode interference (peak value of interference < rated value of input range) > 40 db crosstalk between the inputs > 50 db
5 product information on the manual S7-300 module specifications, edition 1 1/2002, (a5e00105505-02) a5e00236204-01 operational limit (in the entire temperature range, with reference to the input range) voltage input 5 v 10 v 1 to 5 v 0 to 10 v 0.6 % 50 mv 500 mv 1 v 0.5 % current input 20 ma 0 to 20 ma 4 to 20 ma 0.5 % resistance 0 to 6 k ? 0 to 600 ? 0.5 % 0.5 % resistance thermometer pt 100 ni 100 standard 1.2 k pt 100 ni 100 climatic 1 k ni 1000, lg-ni 1000 standard 1 k ni 1000 lg-ni 1000 climatic 1 k basic error limit (operational limit at 25 c, with reference to the input range) voltage input 5 v 10 v 1 to 5 v 0 to 10 v 0.4 % 50 mv 500 mv 1 v 0.3 % current input 20 ma 0 to 20 ma 4 to 20 ma 0.3 % resistance 0 to 6 k ? 0 to 600 ? 0.3 % 0.3 % resistance thermometer pt 100 ni 100 standard 1 k pt 100 ni 100 climatic 0.8 k ni 1000 lg-ni 1000 standard 0.8 k ni 1000 lg-ni 1000 climatic 0.8 k temperature error (with reference to the input range) 0.006 %/k / 0.006 k/k linearity error (with reference to the input range) 0.1 %/ 0.1 k repeat accuracy (steady state at 25 c, with reference to the input range) 0.1 % / 0.1 k status, interrupts, diagnostics interrupts none diagnostic functions none data for selecting a sensor input range (rated values)/input resistance voltage 50 mv 500 mv 1 v 5 v 10 v 1 to 5 v 0 to 10 v 100 k ? current 20 ma 0 to 20 ma 4 to 20 ma 50 ? resistance 0 to 6 k ? 0 to 600 ? 100 m ? resistance thermometer pt 100 ni 100 ni 1000 lg-ni 1000 standard / climatic 100 m ? permissible input voltage for voltage input u+ (destruction limit) max. 30 v continuous permissible input voltage for voltage inputs m+, m ? , s ? (destruction limit) max. 12 v continuous; 30 v for max. 1 s permissible input current for current input i+ (destruction limit) 40 ma
6 product information on the manual S7-300 module specifications, edition 11/2002, (a5e00105505-02) a5e00236204-01 connection of the sensor for measuring voltage possible for measuring current as two-wire transmitter possible, with external supply as four-wire transmitter possible for measuring resistance with 2-conductor terminal possible with 3-conductor terminal possible with 4-conductor terminal possible characteristic linearization parameters can be assigned for resistance thermometer pt 100 standard / climatic ni 100 standard / climatic ni 1000 standard / climatic lg-ni 1000 standard / climatic technical unit for temperature measurement degrees celsius, degrees fahrenheit, kelvin 2 parameters of the sm 331; ai 8 13 bit parameter section 4.7 of the reference manual describes how the analog modules are generally parameterized. an overview of the parameters that you can set and their default settings are shown in the table below.
7 product information on the manual S7-300 module specifications, edition 1 1/2002, (a5e00105505-02) a5e00236204-01 table 1 parameters of the sm 331; ai 8 13 bit parameter value range default settings parameter type scope measurement measuring method deactivated u voltage i current r resistance rtd thermal resistance u measuring range voltage 50 mv; 500 mv; 1 v; 1 to 5 v; 5 v; 0 to 10 v; 10 v 10 v current 0 to 20 ma; 4 to 20 ma; 20 ma 20 ma resistance 0 to 600 ? ; 0 to 6 k ? 600 ? thermal resistance (linear) pt 100 climatic / standard ni 100 climatic / standard ni 1000 climatic / standard lg-ni 1000 climatic/standard pt 100 standard dynamic channel temperature coefficient pt 100 0.003850 ? ? / c (ist-90) ni 100 / ni 1000 0.006180 ?/? / c lg-ni 1000 0.005000 ?/? / c 0.003850 interference frequency suppression 50 hz, 60 hz 50 hz temperature unit degrees celsius, degrees fahrenheit, kelvin* degrees celsius module * only pt 100 standard, ni 100 standard, ni 1000 standard, lg-ni 1000 standard 3 measuring methods of the sm 331; ai 8 13 bit measuring methods you can set the following measuring methods for the input channels: voltage measurement current measurement resistance measurement you make the setting by means of the ? measuring type ? parameter in step 7 .
8 product information on the manual S7-300 module specifications, edition 11/2002, (a5e00105505-02) a5e00236204-01 unused channels set the ? measuring type ? parameter for unused channels to ? disabled ? . in this way you shorten the module ? s scan cycle time. 4 parameters of the sm 331; ai 8 13 bit structure of record 1 the figure below shows the structure of record 1 of the parameters of the analog input module. you activate a parameter by setting the corresponding bit in the bytes to ? 1 ? . byte 0 byte 1 interference suppression byte 2 byte 3 byte 4 byte 5 byte 6 byte 7 byte 8 byte 9 temperature measurement meas. method and meas. range channel 0 meas. method and meas. range channel 1 meas. method and meas. range channel 2 meas. method and meas. range channel 3 meas. method and meas. range channel 4 meas. method and meas. range channel 6 meas. method and meas. range channel 7 meas. method and meas. range channel 5 70 432 1 65 70 432 1 65 70 432 1 65 byte 10 temperature coefficient channel 0 and 1 byte 11 temperature coefficient channel 2 and 3 byte 12 temperature coefficient channel 4 and 5 byte 13 temperature coefficient channel 6 and 7 70 432 1 65 channel 0, 2, 4, 6 channel 1, 3, 5, 7 measuring method measuring range figure 2 record 1 of the parameters of the analog input modules
9 product information on the manual S7-300 module specifications, edition 1 1/2002, (a5e00105505-02) a5e00236204-01 temperature measurement the table below contains the coding for the different temperature measurements that you enter in byte 0 of record 1 (see figure 2). table 2 coding for the temperature measurement of the analog input module temperature unit for linearization coding degrees celsius 2#0000 0000 degrees fahrenheit 2#0000 1000 kelvin 2#0001 0000 interference frequency suppression the table below contains the coding for the different frequencies that you enter in byte 1 of record 1 (see figure 2). you have to calculate the resulting integration time per module. table 3 coding for the interference frequency suppression of the analog input module interference suppression integration time coding 60 hz 50 ms 2#01 50 hz 60 ms 2#10 measuring methods and measuring ranges the table below contains all the measuring methods and measuring ranges of the analog input module with their coding. you have to enter this coding in bytes 2 to 13 of record 1 (see figure 2). note note that the front connector on the analog input module must be wired appropriately, depending on the measuring range.
10 product information on the manual S7-300 module specifications, edition 11/2002, (a5e00105505-02) a5e00236204-01 table 4 coding for the measuring ranges of the analog input module measuring method coding measuring range coding deactivated 2#0000 deactivated 2#0000 voltage 2#0001 50 mv 500 mv 1 v 5 v 1 to 5 v 0 to 10 v 10 v 2#1011 2#0011 2#0100 2#0110 2#0111 2#1000 2#1001 current 2#0010 0 to 20 ma 4 to 20 ma 20 ma 2#0010 2#0011 2#0100 resistance 2#0101 600 ? 6 k ? 2#0110 2#1000 thermal resistance (linear) 2#1001 pt 100 climatic pt 100 standard ni 100 climatic ni 100 standard ni 1000 / lg-ni 1000 climatic ni 1000 / lg-ni 1000 standard 2#0000 2#0010 2#0001 2#0011 2#1010 2#0110 temperature coefficient the table below contains the coding for the temperature coefficient that you enter in bytes 10 to 13 of record 1 (see figure 2). table 5 coding for the temperature measurement of the analog input module temperature coefficient measuring range coding pt 0.003850 ? / ? / c (its-90) pt 100 2#0100 ni 0.006180 ? / ? / c ni 100 / ni 1000 2#1000 ni 0.005000 ? / ? / c lg-ni 1000 2#1010
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