Bộ điều khiển|module|Siemens|6ES7331-7KF02-0AB0

Analog input module SM 331; AI 8 x 12 bit;(6ES7331-7KF02-0AB0)

Order number

6ES7331-7KF02-0AB0

Properties

8 inputs in 4 channel groups
Programmable measurement type at each channel group
- – Voltage
- – Current
- – Resistance
- – Temperature
Programmable resolution at each channel group (9/12/14 bits + sign)
Any measuring range selection per channel group
Programmable diagnostics and diagnostic interrupt
Programmable limit value monitoring for 2 channels
Programmable hardware interrupt when limit is exceeded
Electrically isolated to CPU and load voltage (not for 2-wire transducers)

Resolution

The resolution of measured values is directly dependent of the selected integration time. In other words, the longer the integration time for an analog input channel, the higher the resolution of a measured value.

Diagnostics

For information on diagnostics messages at the “group diagnostics” parameter, refer to chapter Diagnostic messages of analog input modules.

Hardware interrupts

Hardware interrupts for channel groups 0 and 1 can be programmed in STEP 7. However, set a hardware interrupt only for the first channel of a channel group, that is, either at channel 0, or at channel 2

Terminal assignment

The diagrams below show various wiring options The input impedance depends on the setting of the measuring range module, see table Measurement types and ranges.

Wiring: Voltage measurement

Figure: Block diagram and wiring diagram

Measuring range module settings

Measuring range	Measuring range module setting
± 80 mV ± 250 mV ± 500 mV ± 1,000 mV	A
± 2.5 V ± 5 V 1 V to 5 V ± 10 V	B

Measuring range

Measuring range module setting

± 80 mV

± 250 mV

± 500 mV

± 1,000 mV

± 2.5 V

± 5 V

1 V to 5 V

± 10 V

Wiring: 2-wire and 4-wire transducers for current measurement

Figure: Block diagram and wiring diagram

Note

The interconnection between M_ANAand M- (terminals 11, 13, 15, 17, 19) is not required when using grounded 4-wire transducers with non-isolated supply.

Measuring range module settings

Measuring range	Measuring range module setting
2-wire transducer	4 mA to 20 mA	D
4-wire transducer	± 3.2 mA ± 10 mA 0 mA to 20 mA 4 mA to 20 mA ± 20 mA	C

Measuring range

Measuring range module setting

2-wire transducer

4 mA to 20 mA

4-wire transducer

± 3.2 mA

± 10 mA

0 mA to 20 mA

4 mA to 20 mA

± 20 mA

Caution

Measuring range module in “Current” position

Any voltage measurement will destroy the measuring range module if “current” measuring mode is set.

Wiring: 2-, 3- and 4-wire connection of resistance transducers or thermoresistors

①	4-wire connection
②	3-wire connection, no compensation for line resistors
③	2-wire connection, no compensation for line resistors

Figure: Block diagram and wiring diagram

Measuring range module settings

Measuring range	Measuring range module setting
150 Ω 300 Ω 600 Ω	A
Thermoresistor (linear, 4-wire connection) (temperature measurement) RTD-4L	Pt 100 Klima Ni 100 Klima Pt 100 Standard Ni 100 Standard	A

Measuring range

Measuring range module setting

150 Ω

300 Ω

600 Ω

Thermoresistor
(linear, 4-wire connection) (temperature measurement)
RTD-4L

Pt 100 Klima

Ni 100 Klima

Pt 100 Standard

Ni 100 Standard

Note

“Resistance measurement” is only available at one channel per group. The “2nd” channel of the group is used accordingly for current measuring mode (I_C). The “1st” channel of the group returns the measured value. The “2nd” channel of the group is assigned the default overflow value “7FFF_H.”
There is no compensation of the line resistance with a 2 and 3-wire connection.

Wiring: Thermocouples with external compensation

Insert a bridge between Comp+ and M_ANA when using the internal compensation.

Figure: Block diagram and wiring diagram

Measuring range module settings

Measuring range		Measuring range module setting
Thermocouple TC-I (internal comparison) (thermal voltage measurement) Linearization is ignored	Type N [NiCrSi-NiSi] Type E [NiCr-CuNi] Type J [Fe-CuNi] Type K [NiCr-Ni] Type L [Fe-CuNi]	A
Thermocouple TC-E (external comparison) (thermovoltage measurement) Linearization is ignored		A
Thermocouple (linear, internal comparison) (temperature measurement) TC-IL	Type N [NiCrSi-NiSi] Type E [NiCr-CuNi] Type J [Fe-CuNi] Type K [NiCr-Ni] Type L [Fe-CuNi]	A
Thermocouple (linear, external comparison) (temperature measurement) TC-EL		A

Note

An interconnection of M- and M_ANAis prohibited when using grounded thermocouples. In this case, you must ensure that low-resistance equipotential bonding is in place so that the permitted common-mode voltage is not exceeded.
Interconnect M- and M_ANAwhen using non-grounded thermocouples

Technical specifications

Technical specifications
Dimensions and weight
Dimensions W x H x D (mm)	40 x 125 x 117
Weight	approx. 250 g
Module-specific data
Supports isochronous mode	No
Number of inputs with resistive transducers	8 4
Cable length shielded	max. 200 m max. 50 m at 80 mV and with thermocouples
Voltages, currents, electrical potentials
Rated electronics supply voltage L + Reverse polarity protection	24 V DC Yes
Transducer power supply Supply current short circuit-proof	max. 60 mA (per channel) Yes
Constant current for resistive transducers	typ. 1.67 mA (pulsed)
Electrical isolation between channels and the backplane bus between channels and electronics power supply – Not for 2-wire transducers	Yes Yes
Maximum potential difference between inputs and M_ANA (V_CM) – at signal = 0 V between inputs (V_CM)	typ. 2.5 V DC (> 2.3 V DC) typ. 2.5 V DC (> 2.3 V DC)
Isolation test voltage	500 V DC
Current consumption from the backplane bus from load voltage L+	max. 50 mA max. 30 mA (without 2-wire transducer)
Power loss of the module	typ. 1 W
Generation of analog values
Measuring principle	Integrating
Integration/conversion time/resolution (per channel)
programmable	Yes
Integration time in ms	2.5	16²/₃	20	100
Basic conversion time, including the integration time in ms	3	17	22	102
Additional conversion time for resistance measurement, in ms or	1	1	1	1
additional conversion time for wire-break monitoring in ms or	10	10	10	10
additional conversion time for resistance measurements and wire-break monitoring in ms	16	16	16	16
Resolution in bits (including overrange)	9 bits	12 bits	12 bits	14 bits
Interference frequency suppression at interference frequency f1 in Hz	400	60	50	10
Basic execution time of the module in ms (all channels enabled)	24	136	176	816
Measured value smoothing	none
Interference frequency suppression, error limits
Interference frequency suppression at F = n (f1 ± 1 %), (f1 = interference frequency)
Common mode interference (V_CM < 2.5 V) Seriesmode interference (peak interference value < rated input range)	> 70 dB > 40 dB
Crosstalk between inputs	> 50 dB
Operational limit (across entire temperature range, relative to the measurement range end value in the selected input range)
Voltage input	80 mV 250 mV to 1,000 mV 2.5 V to 10 V		± 1 % ± 0.6 % ± 0.8 %
Current input	3.2 mA to 20 mA		± 0.7 %
Resistance	150 Ω; 300Ω; 600 Ω		± 0. 7 %
Thermocouple	Types E, N, J, K, L		± 1. 1 %
Resistance thermometer	Pt 100/Ni 100		± 0. 7 %
	Pt 100 Klima		± 0. 8 %
Basic error limit (operational limit at 25 °C, relative to the measurement range end value in the selected input range)
Voltage input	80 mV 250 mV to 1,000 mV 2.5 V to 10 V		± 0.7 % ± 0.4 % ± 0.6 %
Current input	3.2 mA to 20 mA		± 0.5 %
Resistance	150 Ω; 300 Ω; 600 Ω		± 0.5 %
Thermocouple	Types E, N, J, K, L		± 0.7 %
Resistance thermometer	Pt 100/Ni 100		± 0.5 %
	Pt 100 Klima		± 0.6 %
Temperature error (relative to input range)	± 0.005%/K
Linearity error (relative to input range)	± 0.05 %
Repeat accuracy (in settled state at 25 °C, relative to input range)	± 0.05 %
Temperature error of internal compensation	± 1 %
Status, interrupts, diagnostics
Interrupts Limit interrupt Diagnostic interrupt	programmable Channels 0 and 2 programmable
Diagnostic functions Group error display Reading diagnostics information	programmable red LED (SF) supported
Encoder selection data
Input ranges (rated values) / input impedance
Voltage	± 80 mV ± 250 mV ± 500 mV ± 1,000 mV ± 2.5 V ± 5 V 1 V to 5 V ± 10 V		10 MΩ 10 MΩ 10 MΩ 10 MΩ 100 kΩ 100 kΩ 100 kΩ 100 kΩ
Current	± 3.2 mA ± 10 mA ± 20 mA 0 mA to 20 mA 4 mA to 20 mA		25 Ω 25 Ω 25 Ω 25 Ω 25 Ω
Resistance	150 Ω 300 Ω 600 Ω		10 MΩ 10 MΩ 10 MΩ
Thermocouples	Types E, N, J, K, L		10 MΩ
Resistance thermometer	Pt 100, Ni 100		10 MΩ
Maximum voltage at voltage input (destruction limit)	max. 20 V, continuous 75 V for the duration of max. 1 s (duty factor 1:20)
Maximum current at current input (destruction limit)	40 mA
Wiring of the signal transmitters	using a 20-pin front connector
for voltage measurement	supported
for current measurement as 2-wire transducer as 4-wire transducer	supported supported
For thermoresistor/resistance measurement with 2-wire connection	Supported, cable resistances are not compensated
with 3-wire connection	Supported, cable resistances are not compensated
with 4-wire connection	Supported, cable resistances are compensated
Load of the 2-wire transducer	max. 820 Ω
Characteristics linearization for thermocouples	programmable Types E, N, J, K, L
for resistance thermometers	Pt 100 (Standard and Klima range) Ni 100 (Standard and Klima range)
Temperature compensation Internal temperature compensation	programmable supported
External temperature compensation with compensating box	supported
Compensation for 0 °C reference junction temperature	supported
Technical unit of temperature measurement	degrees Centigrade

Order number

Properties

Resolution

Diagnostics

Hardware interrupts

Terminal assignment

Wiring: Voltage measurement

Measuring range module settings

Wiring: 2-wire and 4-wire transducers for current measurement

Measuring range module settings

Measuring range module in “Current” position

Wiring: 2-, 3- and 4-wire connection of resistance transducers or thermoresistors

Measuring range module settings

Wiring: Thermocouples with external compensation

Measuring range module settings

Technical specifications

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