Analog input modules record process signals such as pressure or temperature and forward them in digitalized format (16-bit format) to the PLC. They are suitable for measuring current (2-wire and 4-wire transducers), voltage, and resistance, as well as for the connection of resistance thermometers and thermocouples (measurement types depend on the module).

The following analog input modules are available:

AI 8xU/I/R/RTD BA
Analog input module with 8 channels; 16-bit resolution; accuracy +/-0.5%; one potential group; 4 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); 8 channels RTD.
Module width 35 mm
AI 16xI BA;
Analog input module with 16 channels; 16-bit resolution; accuracy +/-0.5%; one potential group; 8 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); 16 channels for current measurement.
Module width 35 mm
AI 16xU BA;
Analog input module with 16 channels; 16-bit resolution; accuracy +/-0.5%; one potential group; 8 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); 16 channels for voltage measurement (measuring ranges from +/- 1V).
Module width 35 mm
AI 4xU/I/RTD/TC ST
Analog input module with 4 channels; 16 bit resolution; accuracy +/-0.3 %; one potential group; 10 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); calibration during runtime.
Module width 25 mm
AI 8xU/I/RTD/TC ST
Analog input module with 8 channels (4 channels for R/RTD measurement); 16-bit resolution; accuracy +/-0.3%; one potential group; 10 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); calibration during runtime.
Module width 35 mm
AI 8xU/I HS
Analog input module with 8 channels; 16-bit resolution; accuracy +/-0.3%; one potential group; 10 V common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); high-speed module with 8 channels in 125 µs; isochronous mode; calibration during runtime.
Module width 35 mm
AI 8xU/R/RTD/TC HF
Analog input module with 8 channels; 16-bit resolution; accuracy +/-0.1%; one potential group; 30 V AC / 60 V DC common-mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); calibration during runtime; characteristic linearization according to GOST 9. Channel for TC compensation or “real” measurement channel; fast mode.
Module width 35 mm
AI 8xU/I HF
Analog input module with 8 channels; 16-bit resolution; accuracy +/-0.1%; one potential group; 30 V AC / 60 V DC common mode voltage; parameterizable diagnostics; hardware interrupts (two upper and lower limit values); calibration during runtime.
Module width 35 mm

Siemens Analog Modules S7-1500 Product Specifications:

Article number	6ES7531-7QD00-0AB0	6ES7531-7KF00-0AB0	6ES7531-7NF10-0AB0	6ES7531-7NF00-0AB0
	S7-1500, AI 4xU/I/RTD/TC ST	S7-1500, AI 8xU/I/RTD/TC ST	S7-1500, AI 8xU/I HS	S7-1500, AI 8xU/I HF
General information
Product type designation	AI 4xU/I/RTD/TC ST	AI 8xU/I/RTD/TC ST	AI 8xU/I HS	AI 8xU/I HF
HW functional status	From FS01	FS04	From FS01	From FS01
Firmware version	V1.0.0	V2.0.0	V2.1.0	V1.1.0
● FW update possible	Yes	Yes	Yes	Yes
Product function
● I&M data	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3	Yes; I&M0 to I&M3
● Isochronous mode	No	No	Yes	No
● Prioritized startup	No	No	Yes	Yes
● Measuring range scalable	No	No	No	No
● Scalable measured values	No	No	No	Yes
● Adjustment of measuring range	No	No	No	Yes
Engineering with
● STEP 7 TIA Portal configurable/integrated from version	V13 / V13.0.2	V12 / V12	V14 / –	V14 / –
● STEP 7 configurable/integrated from version	V5.5 SP3 / –	V5.5 SP3 / –	V5.5 SP3 / –	V5.5 SP3 / –
● PROFIBUS from GSD version/GSD revision	V1.0 / V5.1	V1.0 / V5.1	V1.0 / V5.1	V1.0 / V5.1
● PROFINET from GSD version/GSD revision	V2.3 / –	V2.3 / –	V2.3 / –	V2.3 / –
Operating mode
● Oversampling	No	No	Yes	No
● MSI	Yes	Yes	Yes	Yes
CiR – Configuration in RUN
Reparameterization possible in RUN	Yes	Yes	Yes	Yes
Calibration possible in RUN	Yes	Yes	Yes	Yes
Supply voltage
Rated value (DC)	24 V	24 V	24 V	24 V
permissible range, lower limit (DC)	19.2 V	19.2 V	19.2 V	19.2 V
permissible range, upper limit (DC)	28.8 V	28.8 V	28.8 V	28.8 V
Reverse polarity protection	Yes	Yes	Yes	Yes
Input current
Current consumption, max.	165 mA	240 mA; with 24 V DC supply	240 mA; with 24 V DC supply	50 mA; with 24 V DC supply
Encoder supply
24 V encoder supply
● Short-circuit protection	Yes	Yes	Yes
● Output current, max.	20 mA; Max. 47 mA per channel for a duration < 10 s	20 mA; Max. 47 mA per channel for a duration < 10 s	20 mA; Max. 47 mA per channel for a duration < 10 s
Power
Power available from the backplane bus	0.7 W	0.7 W	1.15 W	0.85 W
Power loss
Power loss, typ.	2.3 W	2.7 W	3.4 W	1.9 W
Analog inputs
Number of analog inputs	4	8	8	8
● For current measurement	4	8	8	8
● For voltage measurement	4	8	8	8
● For resistance/resistance thermometer measurement	2	4
● For thermocouple measurement	4	8
permissible input voltage for voltage input (destruction limit), max.	28.8 V	28.8 V	28.8 V	28.8 V
permissible input current for current input (destruction limit), max.	40 mA	40 mA	40 mA	40 mA
Constant measurement current for resistance-type transmitter, typ.	150 Ohm, 300 Ohm, 600 Ohm, Pt100, Pt200, Ni100: 1.25 mA; 6 000 Ohm, Pt500, Pt1000, Ni1000, LG-Ni1000: 0.625 mA; PTC: 0.472 mA	150 Ohm, 300 Ohm, 600 Ohm, Pt100, Pt200, Ni100: 1.25 mA; 6 000 Ohm, Pt500, Pt1000, Ni1000, LG-Ni1000: 0.625 mA; PTC: 0.472 mA
Technical unit for temperature measurement adjustable	Yes; °C/°F/K	Yes; °C/°F/K
Analog input with oversampling	No
Standardization of measured values	No
Input ranges (rated values), voltages
● 0 to +5 V	No	No	No	No
● 0 to +10 V	No	No	No	No
● 1 V to 5 V	Yes	Yes	Yes	Yes
— Input resistance (1 V to 5 V)	100 kΩ	100 kΩ	50 kΩ	100 kΩ
● -1 V to +1 V	Yes	Yes
— Input resistance (-1 V to +1 V)	10 MΩ	10 MΩ
● -10 V to +10 V	Yes	Yes	Yes	Yes
— Input resistance (-10 V to +10 V)	100 kΩ	100 kΩ	100 kΩ	100 kΩ
● -2.5 V to +2.5 V	Yes	Yes	No	Yes
— Input resistance (-2.5 V to +2.5 V)	10 MΩ	10 MΩ		100 kΩ
● -25 mV to +25 mV	No	No	No	No
● -250 mV to +250 mV	Yes	Yes	No	No
— Input resistance (-250 mV to +250 mV)	10 MΩ	10 MΩ
● -5 V to +5 V	Yes	Yes	Yes	Yes
— Input resistance (-5 V to +5 V)	100 kΩ	100 kΩ	50 kΩ	100 kΩ
● -50 mV to +50 mV	Yes	Yes	No	No
— Input resistance (-50 mV to +50 mV)	10 MΩ	10 MΩ
● -500 mV to +500 mV	Yes	Yes	No	No
— Input resistance (-500 mV to +500 mV)	10 MΩ	10 MΩ
● -80 mV to +80 mV	Yes	Yes	No	No
— Input resistance (-80 mV to +80 mV)	10 MΩ	10 MΩ
Input ranges (rated values), currents
● 0 to 20 mA	Yes	Yes	Yes	Yes
— Input resistance (0 to 20 mA)	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	41 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC
● -20 mA to +20 mA	Yes	Yes	Yes	Yes
— Input resistance (-20 mA to +20 mA)	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	41 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC
● 4 mA to 20 mA	Yes	Yes	Yes	Yes
— Input resistance (4 mA to 20 mA)	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	41 Ω; Plus approx. 42 ohms for overvoltage protection by PTC	25 Ω; Plus approx. 42 ohms for overvoltage protection by PTC
Input ranges (rated values), thermocouples
● Type B	Yes	Yes	No	No
— Input resistance (Type B)	10 MΩ	10 MΩ
● Type C	No	No	No	No
● Type E	Yes	Yes	No	No
— Input resistance (Type E)	10 MΩ	10 MΩ
● Type J	Yes	Yes	No	No
— Input resistance (type J)	10 MΩ	10 MΩ
● Type K	Yes	Yes	No	No
— Input resistance (Type K)	10 MΩ	10 MΩ
● Type L	No	No	No	No
● Type N	Yes	Yes	No	No
— Input resistance (Type N)	10 MΩ	10 MΩ
● Type R	Yes	Yes	No	No
— Input resistance (Type R)	10 MΩ	10 MΩ
● Type S	Yes	Yes	No	No
— Input resistance (Type S)	10 MΩ	10 MΩ
● Type T	Yes	Yes	No	No
— Input resistance (Type T)	10 MΩ	10 MΩ
● Type U	No
● Type TXK/TXK(L) to GOST	No	No	No	No
Input ranges (rated values), resistance thermometer
● Cu 10	No	No	No	No
● Cu 10 according to GOST	No	No	No	No
● Cu 50	No	No	No	No
● Cu 50 according to GOST	No	No	No	No
● Cu 100	No	No	No	No
● Cu 100 according to GOST	No	No	No	No
● Ni 10	No	No	No	No
● Ni 10 according to GOST	No	No	No	No
● Ni 100	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Ni 100)	10 MΩ	10 MΩ
● Ni 100 according to GOST	No	No	No	No
● Ni 1000	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Ni 1000)	10 MΩ	10 MΩ
● Ni 1000 according to GOST	No	No	No	No
● LG-Ni 1000	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (LG-Ni 1000)	10 MΩ	10 MΩ
● Ni 120	No	No	No	No
● Ni 120 according to GOST	No	No	No	No
● Ni 200	No		No	No
● Ni 200 according to GOST	No	No	No	No
● Ni 500	No	No	No	No
● Ni 500 according to GOST	No	No	No	No
● Pt 10	No	No	No	No
● Pt 10 according to GOST	No	No	No	No
● Pt 50	No	No	No	No
● Pt 50 according to GOST	No	No	No	No
● Pt 100	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Pt 100)	10 MΩ	10 MΩ
● Pt 100 according to GOST	No	No	No	No
● Pt 1000	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Pt 1000)	10 MΩ	10 MΩ
● Pt 1000 according to GOST	No	No	No	No
● Pt 200	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Pt 200)	10 MΩ	10 MΩ
● Pt 200 according to GOST	No	No	No	No
● Pt 500	Yes; Standard/climate	Yes; Standard/climate	No	No
— Input resistance (Pt 500)	10 MΩ	10 MΩ
● Pt 500 according to GOST	No	No	No	No
Input ranges (rated values), resistors
● 0 to 150 ohms	Yes	Yes	No	No
— Input resistance (0 to 150 ohms)	10 MΩ	10 MΩ
● 0 to 300 ohms	Yes	Yes	No	No
— Input resistance (0 to 300 ohms)	10 MΩ	10 MΩ
● 0 to 600 ohms	Yes	Yes	No	No
— Input resistance (0 to 600 ohms)	10 MΩ	10 MΩ
● 0 to 3000 ohms	No	No	No	No
● 0 to 6000 ohms	Yes	Yes	No	No
— Input resistance (0 to 6000 ohms)	10 MΩ	10 MΩ
● PTC	Yes	Yes	No	No
— Input resistance (PTC)	10 MΩ	10 MΩ
Thermocouple (TC)
Temperature compensation
— parameterizable	Yes	Yes
— internal temperature compensation	Yes	Yes
— external temperature compensation via RTD	Yes	Yes
— Compensation for 0 °C reference point temperature	Yes; fixed value can be set	Yes; fixed value can be set
— Reference channel of the module	No	Yes
Cable length
● shielded, max.	800 m; for U/I, 200 m for R/RTD, 50 m for TC	800 m; for U/I, 200 m for R/RTD, 50 m for TC	800 m	800 m
Analog value generation for the inputs
Measurement principle
Integration and conversion time/resolution per channel
● Resolution with overrange (bit including sign), max.	16 bit	16 bit	16 bit	24 bit; When using the function “Scaling of the measured values” or “Measuring range adaptation” (32 bit REAL format); 16 bit when using the S7 format (16 bit INTEGER)
● Integration time, parameterizable	Yes	Yes		Yes
● Integration time (ms)	2,5 / 16,67 / 20 / 100 ms	2,5 / 16,67 / 20 / 100 ms		Fast mode: 2.5 / 16.67 / 20 / 100 ms, standard mode: 7.5 / 50 / 60 / 300 ms
● Basic conversion time, including integration time (ms)	9 / 23 / 27 / 107 ms	9 / 23 / 27 / 107 ms		Fast mode: 4 / 18 / 22 / 102 ms; Standard mode: 9 / 52 / 62 / 302 ms
— additional conversion time for wire-break monitoring	9 ms (to be considered in R/RTD/TC measurement)	9 ms (to be considered in R/RTD/TC measurement)
— additional conversion time for resistance measurement	150 ohm, 300 ohm, 600 ohm, Pt100, Pt200, Ni100: 2 ms, 6000 ohm, Pt500, Pt1000, Ni1000, LG-Ni1000, PTC: 4 ms	150 ohm, 300 ohm, 600 ohm, Pt100, Pt200, Ni100: 2 ms, 6000 ohm, Pt500, Pt1000, Ni1000, LG-Ni1000, PTC: 4 ms
● Interference voltage suppression for interference frequency f1 in Hz	400 / 60 / 50 / 10	400 / 60 / 50 / 10 Hz		400 / 60 / 50 / 10 Hz
● Basic execution time of the module (all channels released)			62.5 µs; independent of number of activated channels	Corresponds to the channel with the highest basic conversion time
● Time for offset calibration (per module)	Basic conversion time of the slowest channel	Basic conversion time of the slowest channel
Smoothing of measured values
● parameterizable	Yes	Yes	Yes	Yes
● Step: None	Yes	Yes	Yes	Yes
● Step: low	Yes	Yes	Yes	Yes
● Step: Medium	Yes	Yes	Yes	Yes
● Step: High	Yes	Yes	Yes	Yes
Encoder
Connection of signal encoders
● for voltage measurement	Yes	Yes	Yes	Yes
● for current measurement as 2-wire transducer	Yes	Yes	Yes	Yes; with external transmitter supply
— Burden of 2-wire transmitter, max.	820 Ω	820 Ω	820 Ω
● for current measurement as 4-wire transducer	Yes	Yes	Yes	Yes
● for resistance measurement with two-wire connection	Yes; Only for PTC	Yes; Only for PTC	No	No
● for resistance measurement with three-wire connection	Yes; All measuring ranges except PTC; internal compensation of the cable resistances	Yes; All measuring ranges except PTC; internal compensation of the cable resistances	No	No
● for resistance measurement with four-wire connection	Yes; All measuring ranges except PTC	Yes; All measuring ranges except PTC	No	No
Errors/accuracies
Linearity error (relative to input range), (+/-)	0.02 %	0.02 %	0.02 %	0.02 %
Temperature error (relative to input range), (+/-)	0.005 %/K; With TC type T 0.02 ± % / K	0.005 %/K; With TC type T 0.02 ± % / K	0.005 %/K	0.005 %/K
Crosstalk between the inputs, max.	-80 dB	-80 dB	-60 dB	-80 dB
Repeat accuracy in steady state at 25 °C (relative to input range), (+/-)	0.02 %	0.02 %	0.02 %	0.02 %
Temperature error of internal compensation	±6 °C	±6 °C
note regarding accuracy	at temperatures below 0 °C, the figures for operating error and temperature error are doubled			at temperatures below 0 °C, the figures for operating error and temperature error are doubled
Operational error limit in overall temperature range
● Voltage, relative to input range, (+/-)	0.3 %	0.3 %	0.3 %	0.1 %
● Current, relative to input range, (+/-)	0.3 %	0.3 %	0.3 %	0.1 %
● Resistance, relative to input range, (+/-)	0.3 %	0.3 %
● Resistance thermometer, relative to input range, (+/-)	0.3 %; Ptxxx standard: ±1.5 K, Ptxxx climate: ±0.5 K, Nixxx standard: ±0.5 K, Nixxx climate: ±0.3 K	Ptxxx standard: ±1.5 K, Ptxxx climate: ±0.5 K, Nixxx standard: ±0.5 K, Nixxx climate: ±0.3 K
● Thermocouple, relative to input range, (+/-)	0.3 %; Type B: > 600 °C ±4.6 K, type E: > -200 °C ±1.5 K, type J: > -210 °C ±1.9 K, type K: > -200 °C ±2.4 K, type N: > -200 °C ±2.9 K, type R: > 0 °C ±4.7 K, type S: > 0 °C ±4.6 K, type T: > -200 °C ±2.4 K	Type B: > 600 °C ±4.6 K, type E: > -200 °C ±1.5 K, type J: > -210 °C ±1.9 K, type K: > -200 °C ±2.4 K, type N: > -200 °C ±2.9 K, type R: > 0 °C ±4.7 K, type S: > 0 °C ±4.6 K, type T: > -200 °C ±2.4 K
Basic error limit (operational limit at 25 °C)
● Voltage, relative to input range, (+/-)	0.1 %	0.1 %	0.2 %	0.05 %
● Current, relative to input range, (+/-)	0.1 %	0.1 %	0.2 %	0.05 %
● Resistance, relative to input range, (+/-)	0.1 %	0.1 %
● Resistance thermometer, relative to input range, (+/-)	0.1 %; Ptxxx standard: ±0.7 K, Ptxxx climate: ±0.2 K, Nixxx standard: ±0.3 K, Nixxx climate: ±0.15 K	Ptxxx standard: ±0.7 K, Ptxxx climate: ±0.2 K, Nixxx standard: ±0.3 K, Nixxx climate: ±0.15 K
● Thermocouple, relative to input range, (+/-)	0.1 %; Type B: > 600 °C ±1.7 K, type E: > -200 °C ±0.7 K, type J: > -210 °C ±0.8 K, type K: > -200 °C ±1.2 K, type N: > -200 °C ±1.2 K, type R: > 0 °C ±1.9 K, type S: > 0 °C ±1.9 K, type T: > -200 °C ±0.8 K	Type B: > 600 °C ±1.7 K, type E: > -200 °C ±0.7 K, type J: > -210 °C ±0.8 K, type K: > -200 °C ±1.2 K, type N: > -200 °C ±1.2 K, type R: > 0 °C ±1.9 K, type S: > 0 °C ±1.9 K, type T: > -200 °C ±0.8 K
Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency
● Series mode interference (peak value of interference < rated value of input range), min.	40 dB	40 dB		80 dB; in the Standard operating mode, 40 dB in the Fast operating mode
● Common mode voltage, max.	10 V	10 V	10 V	60 V DC/30 V AC
● Common mode interference, min.	60 dB	60 dB	50 dB at 400 Hz; 60 dB at 60 / 50 / 10 Hz	80 dB
Isochronous mode
Filtering and processing time (TCI), min.			80 µs
Bus cycle time (TDP), min.			250 µs
Interrupts/diagnostics/status information
Diagnostics function	Yes	Yes	Yes	Yes
Alarms
● Diagnostic alarm	Yes	Yes	Yes	Yes
● Limit value alarm	Yes; two upper and two lower limit values in each case	Yes; two upper and two lower limit values in each case	Yes; two upper and two lower limit values in each case	Yes; two upper and two lower limit values in each case
Diagnoses
● Monitoring the supply voltage	Yes	Yes	Yes	Yes
● Wire-break	Yes; Only for 1 to 5 V, 4 to 20 mA, TC, R, and RTD	Yes; Only for 1 to 5 V, 4 to 20 mA, TC, R, and RTD	Yes; only for 1 … 5 V and 4 … 20 mA	Yes; only for 1 … 5 V and 4 … 20 mA
● Short-circuit
● Group error
● Overflow/underflow	Yes	Yes	Yes	Yes
Diagnostics indication LED
● RUN LED	Yes; green LED	Yes; green LED	Yes; green LED	Yes; green LED
● ERROR LED	Yes; red LED	Yes; red LED	Yes; red LED	Yes; red LED
● MAINT LED
● Monitoring of the supply voltage (PWR-LED)	Yes; green LED	Yes; green LED	Yes; green LED	Yes; green LED
● Channel status display	Yes; green LED	Yes; green LED	Yes; green LED	Yes; green LED
● for channel diagnostics	Yes; red LED	Yes; red LED	Yes; red LED	Yes; red LED
● for module diagnostics	Yes; red LED	Yes; red LED	Yes; red LED	Yes; red LED
Potential separation
Potential separation channels
● between the channels	No	No	No	Yes
● between the channels, in groups of	4	8	8	1
● between the channels and backplane bus	Yes	Yes	Yes	Yes
● between the channels and the power supply of the electronics	Yes	Yes	Yes	Yes
Permissible potential difference
between different circuits				60 V DC/30 V AC; insulation rated for 120 V AC basic insulation: between the channels and the supply voltage L+; between the channels and the backplane bus; between the channels
between the inputs (UCM)	20 V DC	20 V DC	20 V DC
Between the inputs and MANA (UCM)	10 V DC	10 V DC	10 V DC
Isolation
Isolation tested with	707 V DC (type test)	707 V DC (type test)	707 V DC (type test)	2 000 V DC between the channels and the supply voltage L+; 2 000 V DC between the channels and the backplane bus; 2 000 V DC between the channels; 707 V DC (type test) between the supply voltage L+ and the backplane bus
Standards, approvals, certificates
Suitable for applications according to AMS 2750		Yes; Declaration of Conformity, see online support entry 109757262
Suitable for applications according to CQI-9		Yes; Based on AMS 2750 E
Ambient conditions
Ambient temperature during operation
● horizontal installation, min.	-25 °C; From FS03	0 °C	-25 °C; From FS02	-30 °C; From FS02
● horizontal installation, max.	60 °C	60 °C	60 °C	60 °C
● vertical installation, min.	-25 °C; From FS03	0 °C	-25 °C; From FS02	-30 °C; From FS02
● vertical installation, max.	40 °C	40 °C	40 °C	40 °C
Altitude during operation relating to sea level
● Installation altitude above sea level, max.	5 000 m; Restrictions for installation altitudes > 2 000 m, see manual	5 000 m; Restrictions for installation altitudes > 2 000 m, see manual	5 000 m; Restrictions for installation altitudes > 2 000 m, see manual
Dimensions
Width	25 mm	35 mm	35 mm	35 mm
Height	147 mm	147 mm	147 mm	147 mm
Depth	129 mm	129 mm	129 mm	129 mm
Weights
Weight, approx.	210 g	310 g	300 g	280 g
Other
Note:	Supplied incl. 40-pole push-in front connectors. Additional basic error and noise for integration time = 2.5 ms: Voltage: ±250 mV (±0.02%), ±80 mV (±0.05%), ±50 mV (±0.05%); resistance: 150 Ohms (±0.02%); resistance thermometer: Pt100 climate: ±0.08 K, Ni100 climate: ±0.08 K; thermoelement: Type B, R, S: ±3 K, type E, J, K, N, T: ±1 K	Additional basic error and noise for integration time = 2.5 ms: Voltage: ±250 mV (±0.02%), ±80 mV (±0.05%), ±50 mV (±0.05%); resistance: 150 ohms ±0.02%; resistance thermometer: Pt100 climate: ±0.08 K, Ni100 climate: ±0.08 K; thermocouple: Type B, R, S: ±3 K, type E, J, K, N, T: ±1 K

Article number		6ES7531-7PF00-0AB0
		S7-1500, AI 8 X U/R/RTD/TC HF
General information
Product type designation		AI 8xU/R/RTD/TC HF
HW functional status		FS01
Firmware version		V1.1.0
● FW update possible		Yes
Product function
● I&M data		Yes; I&M0 to I&M3
● Isochronous mode		No
● Prioritized startup		Yes
● Measuring range scalable		Yes
● Scalable measured values		No
● Adjustment of measuring range		No
Engineering with
● STEP 7 TIA Portal configurable/integrated from version		V14 / –
● STEP 7 configurable/integrated from version		V5.5 SP3 / –
● PROFIBUS from GSD version/GSD revision		V1.0 / V5.1
● PROFINET from GSD version/GSD revision		V2.3 / –
Operating mode
● Oversampling		No
● MSI		Yes
CiR – Configuration in RUN
Reparameterization possible in RUN		Yes
Calibration possible in RUN		Yes
Supply voltage
Rated value (DC)		24 V
permissible range, lower limit (DC)		19.2 V
permissible range, upper limit (DC)		28.8 V
Reverse polarity protection		Yes
Input current
Current consumption, max.		55 mA; with 24 V DC supply
Power
Power available from the backplane bus		0.85 W
Power loss
Power loss, typ.		1.9 W
Analog inputs
Number of analog inputs		8; Plus one additional RTD (reference) channel
● For voltage measurement		8; Plus one additional RTD (reference) channel
● For resistance/resistance thermometer measurement		8; Plus one additional RTD (reference) channel
● For thermocouple measurement		8; Plus one additional RTD (reference) channel
permissible input voltage for voltage input (destruction limit), max.		20 V
Constant measurement current for resistance-type transmitter, typ.		150 Ohm, 300 Ohm, 600 Ohm, Cu10, Cu50, Cu100, Ni10, Ni100, Ni120, Ni200, Pt10, Pt50, Pt100, Pt200 climate: 1 mA; 6 kOhm, Ni500, Ni1000, LG-Ni1000, Pt200 standard, Pt500, Pt1000, PTC: 0.25 mA
Technical unit for temperature measurement adjustable		Yes; °C/°F/K
Input ranges (rated values), voltages
● 0 to +5 V		No
● 0 to +10 V		No
● 1 V to 5 V		No
● -1 V to +1 V		Yes
— Input resistance (-1 V to +1 V)		10 MΩ
● -10 V to +10 V		No
● -2.5 V to +2.5 V		No
● -25 mV to +25 mV		Yes
— Input resistance (-25 mV to +25 mV)		10 MΩ
● -250 mV to +250 mV		Yes
— Input resistance (-250 mV to +250 mV)		10 MΩ
● -5 V to +5 V		No
● -50 mV to +50 mV		Yes
— Input resistance (-50 mV to +50 mV)		10 MΩ
● -500 mV to +500 mV		Yes
— Input resistance (-500 mV to +500 mV)		10 MΩ
● -80 mV to +80 mV		Yes
— Input resistance (-80 mV to +80 mV)		10 MΩ
Input ranges (rated values), currents
● 0 to 20 mA		No
● -20 mA to +20 mA		No
● 4 mA to 20 mA		No
Input ranges (rated values), thermocouples
● Type B		Yes
— Input resistance (Type B)		10 MΩ
● Type C		Yes
— Input resistance (Type C)		10 MΩ
● Type E		Yes
— Input resistance (Type E)		10 MΩ
● Type J		Yes
— Input resistance (type J)		10 MΩ
● Type K		Yes
— Input resistance (Type K)		10 MΩ
● Type L		No
● Type N		Yes
— Input resistance (Type N)		10 MΩ
● Type R		Yes
— Input resistance (Type R)		10 MΩ
● Type S		Yes
— Input resistance (Type S)		10 MΩ
● Type T		Yes
— Input resistance (Type T)		10 MΩ
● Type TXK/TXK(L) to GOST		Yes
— Input resistance (Type TXK/TXK(L) to GOST)		10 MΩ
Input ranges (rated values), resistance thermometer
● Cu 10		Yes; Standard/climate
— Input resistance (Cu 10)		10 MΩ
● Cu 10 according to GOST		Yes; Standard/climate
— Input resistance (Cu 10 according to GOST)		10 MΩ
● Cu 50		Yes; Standard/climate
— Input resistance (Cu 50)		10 MΩ
● Cu 50 according to GOST		Yes; Standard/climate
— Input resistance (Cu 50 according to GOST)		10 MΩ
● Cu 100		Yes; Standard/climate
— Input resistance (Cu 100)		10 MΩ
● Cu 100 according to GOST		Yes; Standard/climate
— Input resistance (Cu 100 according to GOST)		10 MΩ
● Ni 10		Yes; Standard/climate
— Input resistance (Ni 10)		10 MΩ
● Ni 10 according to GOST		Yes; Standard/climate
— Input resistance (Ni 10 according to GOST)		10 MΩ
● Ni 100		Yes; Standard/climate
— Input resistance (Ni 100)		10 MΩ
● Ni 100 according to GOST		Yes; Standard/climate
— Input resistance (Ni 100 according to GOST)		10 MΩ
● Ni 1000		Yes; Standard/climate
— Input resistance (Ni 1000)		10 MΩ
● Ni 1000 according to GOST		Yes; Standard/climate
— Input resistance (Ni 1000 according to GOST)		10 MΩ
● LG-Ni 1000		Yes; Standard/climate
— Input resistance (LG-Ni 1000)		10 MΩ
● Ni 120		Yes; Standard/climate
— Input resistance (Ni 120)		10 MΩ
● Ni 120 according to GOST		Yes; Standard/climate
— Input resistance (Ni 120 according to GOST)		10 MΩ
● Ni 200		Yes; Standard/climate
— Input resistance (Ni 200)		10 MΩ
● Ni 200 according to GOST		Yes; Standard/climate
— Input resistance (Ni 200 according to GOST)		10 MΩ
● Ni 500		Yes; Standard/climate
— Input resistance (Ni 500)		10 MΩ
● Ni 500 according to GOST		Yes; Standard/climate
— Input resistance (Ni 500 according to GOST)		10 MΩ
● Pt 10		Yes; Standard/climate
— Input resistance (Pt 10)		10 MΩ
● Pt 10 according to GOST		Yes; Standard/climate
— Input resistance (Pt 10 according to GOST)		10 MΩ
● Pt 50		Yes; Standard/climate
— Input resistance (Pt 50)		10 MΩ
● Pt 50 according to GOST		Yes; Standard/climate
— Input resistance (Pt 50 according to GOST)		10 MΩ
● Pt 100		Yes; Standard/climate
— Input resistance (Pt 100)		10 MΩ
● Pt 100 according to GOST		Yes; Standard/climate
— Input resistance (Pt 100 according to GOST)		10 MΩ
● Pt 1000		Yes; Standard/climate
— Input resistance (Pt 1000)		10 MΩ
● Pt 1000 according to GOST		Yes; Standard/climate
— Input resistance (Pt 1000 according to GOST)		10 MΩ
● Pt 200		Yes; Standard/climate
— Input resistance (Pt 200)		10 MΩ
● Pt 200 according to GOST		Yes; Standard/climate
— Input resistance (Pt 200 according to GOST)		10 MΩ
● Pt 500		Yes; Standard/climate
— Input resistance (Pt 500)		10 MΩ
● Pt 500 according to GOST		Yes; Standard/climate
— Input resistance (Pt 500 according to GOST)		10 MΩ
Input ranges (rated values), resistors
● 0 to 150 ohms		Yes
— Input resistance (0 to 150 ohms)		10 MΩ
● 0 to 300 ohms		Yes
— Input resistance (0 to 300 ohms)		10 MΩ
● 0 to 600 ohms		Yes
— Input resistance (0 to 600 ohms)		10 MΩ
● 0 to 3000 ohms		No
● 0 to 6000 ohms		Yes
— Input resistance (0 to 6000 ohms)		10 MΩ
● PTC		Yes
— Input resistance (PTC)		10 MΩ
Thermocouple (TC)
Temperature compensation
— parameterizable		Yes
— internal temperature compensation		Yes
— external temperature compensation via RTD		Yes
— Compensation for 0 °C reference point temperature		Yes; fixed value can be set
— Reference channel of the module		Yes; 9th channel that can be used as a genuine 9th RTD channel regardless of the parameterization of the other channels, or that can be used for compensation in the case of TC measurement
Cable length
● shielded, max.		800 m; at U; 200 m at R/RTD/TC
Analog value generation for the inputs
Integration and conversion time/resolution per channel
● Resolution with overrange (bit including sign), max.		21 bit; For measuring mode RTC and TC when using the function “Scalable temperature measuring range” (32 bit REAL format); 16 bit for measuring mode R and U; 16 bit for all measuring modes when using the S7 format (16 bit INTEGER)
● Integration time, parameterizable		Yes
● Integration time (ms)		Fast mode: 2.5 / 16.67 / 20 / 100 ms, standard mode: 7.5 / 50 / 60 / 300 ms
● Basic conversion time, including integration time (ms)		Fast mode: 4 / 18 / 22 / 102 ms; Standard mode: 9 / 52 / 62 / 302 ms
— additional conversion time for wire-break monitoring		Thermocouples, 150 Ohm, 300 Ohm, 600 Ohm, Cu10, Cu50, Cu100, Ni10, Ni100, Ni120, Ni200, Pt10, Pt50, Pt100: 4 ms; 6 kOhm, Ni500, Ni1000, LG-Ni1000, Pt200, Pt500, Pt1000: 13 ms
● Interference voltage suppression for interference frequency f1 in Hz		400 / 60 / 50 / 10 Hz
● Basic execution time of the module (all channels released)		Corresponds to the channel with the highest basic conversion time
Smoothing of measured values
● parameterizable		Yes
● Step: None		Yes
● Step: low		Yes
● Step: Medium		Yes
● Step: High		Yes
Encoder
Connection of signal encoders
● for voltage measurement		Yes
● for current measurement as 2-wire transducer		No
● for current measurement as 4-wire transducer		No
● for resistance measurement with two-wire connection		Yes
● for resistance measurement with three-wire connection		Yes; All measuring ranges except PTC; internal compensation of the cable resistances
● for resistance measurement with four-wire connection		Yes; All measuring ranges except PTC
Errors/accuracies
Linearity error (relative to input range), (+/-)		0.02 %
Temperature error (relative to input range), (+/-)		0.005 %/K
Crosstalk between the inputs, max.		-80 dB
Repeat accuracy in steady state at 25 °C (relative to input range), (+/-)		0.02 %
Temperature error of internal compensation		±1,5 °C
Operational error limit in overall temperature range
● Voltage, relative to input range, (+/-)		0.1 %
● Resistance, relative to input range, (+/-)		0.1 %
● Resistance thermometer, relative to input range, (+/-)		Cuxxx Standard: ±0.5 K, Cuxxx Klima: ±0.5 K, Ptxxx Standard: ±1 K, Ptxxx Klima: ±0.5 K, Nixxx Standard: ±0.5 K, Nixxx Klima: ±0.3 K
● Thermocouple, relative to input range, (+/-)		Type B: > 600 °C ±2 K, Type E: > -200 °C ±1 K, Type J: > -210 °C ±1 K, Type K: > -200 °C ±2 K, Type N: > -200 °C ±2 K, Type R: > 0 °C ±2 K, Type S: > 0 °C ±2 K, Type T: > -200 °C ±1 K, Type C: ±4 K, Type TXK/TXK(L): ±1 K
Basic error limit (operational limit at 25 °C)
● Voltage, relative to input range, (+/-)		0.05 %
● Resistance, relative to input range, (+/-)		0.05 %
● Resistance thermometer, relative to input range, (+/-)		Cuxxx Standard: ±0.3 K, Cuxxx Klima: ±0.2 K, Ptxxx Standard: ±0.5 K, Ptxxx Klima: ±0.2 K, Nixxx Standard: ±0.3 K, Nixxx Klima: ±0.15 K
● Thermocouple, relative to input range, (+/-)		Type B: > 600 °C ±1 K, Type E: > -200 °C ±0.5 K, Type J: > -210 °C ±0.5 K, Type K: > -200 °C ±1 K, Type N: > -200 °C ±1 K, Type R: > 0 °C ±1 K, Type S: > 0 °C ±1 K, Type T: > -200 °C ±0.5 K, Type C: ±2 K, Type TXK/TXK(L): ±0.5 K
Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency
● Series mode interference (peak value of interference < rated value of input range), min.		80 dB; in the Standard operating mode, 40 dB in the Fast operating mode
● Common mode voltage, max.		60 V DC/30 V AC
● Common mode interference, min.		80 dB
Interrupts/diagnostics/status information
Diagnostics function		Yes
Alarms
● Diagnostic alarm		Yes
● Limit value alarm		Yes; two upper and two lower limit values in each case
Diagnoses
● Monitoring the supply voltage		Yes
● Wire-break		Yes; Only with TC, R, RTD
● Overflow/underflow		Yes
Diagnostics indication LED
● RUN LED		Yes; green LED
● ERROR LED		Yes; red LED
● Monitoring of the supply voltage (PWR-LED)		Yes; green LED
● Channel status display		Yes; green LED
● for channel diagnostics		Yes; red LED
● for module diagnostics		Yes; red LED
Potential separation
Potential separation channels
● between the channels		Yes
● between the channels, in groups of		1
● between the channels and backplane bus		Yes
● between the channels and the power supply of the electronics		Yes
Permissible potential difference
between different circuits		60 V DC/30 V AC; insulation rated for 120 V AC basic insulation: between the channels and the supply voltage L+; between the channels and the backplane bus; between the channels
Isolation
Isolation tested with		2 000 V DC between the channels and the supply voltage L+; 2 000 V DC between the channels and the backplane bus; 2 000 V DC between the channels; 707 V DC (type test) between the supply voltage L+ and the backplane bus
Standards, approvals, certificates
Suitable for applications according to AMS 2750		Yes; Declaration of Conformity, see online support entry 109757262
Suitable for applications according to CQI-9		Yes; Based on AMS 2750 E
Ambient conditions
Ambient temperature during operation
● horizontal installation, min.		0 °C
● horizontal installation, max.		60 °C
● vertical installation, min.		0 °C
● vertical installation, max.		40 °C
Dimensions
Width		35 mm
Height		147 mm
Depth		129 mm
Weights
Weight, approx.		290 g
Other
Note:		for the R/RDT three-wire measurement, the conductor compensation is made alternating with the measurement; this then requires two module cycles for a measured value