Properties of 6ES7331-7KF02-0AB0

● 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 measured value resolution is directly proportional to the selected integration time, that is, the measured value resolution increases in proportion to length of the integration time at the analog input channel.

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

Measuring range module settings of 6ES7331-7KF02-0AB0

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

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

Measuring range module settings of 6ES7331-7KF02-0AB0

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

Measuring range module settings

Note
• "Resistance measurement" is only available at one channel per group. The "2nd" channel of the group is used accordingly for current measuring mode (IC). The "1st" channel of the group returns the measured value. The "2nd" channel of the group is assigned the default overflow value "7FFFH."
• There is no compensation for power resistors for "2- and 3-wire connections". 

Wiring: Thermocouples with external compensation
Insert a bridge between Comp+ and MANA when using the internal compensation.

Measuring range module settings

Note
• An interconnection of M- and MANA is 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 MANA when using non-grounded thermocouples 

Technical specifications of Analog input module 6ES7331-7KF02-0AB0

	SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 8AI, RESOLUTION 9/12/14 BITS, U/I/THERMOCOUPLE/RESISTANCE INTERRUPT, DIAGNOSTICS; 1X20PIN REMOVE/INSERT W. BACKPLANE BUS
Supply voltage
Load voltage L+
Rated value (DC)	24 V
Reverse polarity protection	Yes
Input current
from load voltage L+ (without load), max.	200 mA
from backplane bus 5 V DC, max.	50 mA
Power losses
Power loss, typ.	1 W
Analog inputs
Number of analog inputs	8
Number of analog inputs for resistance measurement	4
permissible input voltage for voltage input (destruction limit), max.	20 V; continuous; 75 V for max. 1 s (mark to space ratio 1:20)
permissible input current for current input (destruction limit), max.	40 mA
Input ranges
Voltage	Yes
Current	Yes
Thermocouple	Yes
Resistance thermometer	Yes
Resistance	Yes
Input ranges (rated values), voltages
0 to +10 V	No
1 to 5 V	Yes
Input resistance (1 to 5 V)	100 kΩ
1 to 10 V	No
-1 V to +1 V	Yes
Input resistance (-1 V to +1 V)	10 MΩ
-10 V to +10 V	Yes
Input resistance (-10 V to +10 V)	100 kΩ
-2.5 V to +2.5 V	Yes
Input resistance (-2.5 V to +2.5 V)	100 kΩ
-250 mV to +250 mV	Yes
Input resistance (-250 mV to +250 mV)	10 MΩ
-5 V to +5 V	Yes
Input resistance (-5 V to +5 V)	100 kΩ
-50 mV to +50 mV	No
-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	Yes
Input resistance (0 to 20 mA)	25 Ω
-10 to +10 mA	Yes
Input resistance (-10 to +10 mA)	25 Ω
-20 to +20 mA	Yes
Input resistance (-20 to +20 mA)	25 Ω
-3.2 to +3.2 mA	Yes
Input resistance (-3.2 to +3.2 mA)	25 Ω
4 to 20 mA	Yes
Input resistance (4 to 20 mA)	25 Ω
Input ranges (rated values), thermoelements
Type B	No
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	Yes
Input resistance (Type L)	10 MΩ
Type N	Yes
Input resistance (Type N)	10 MΩ
Type R	No
Type S	No
Type T	No
Type U	No
Type TXK/TXK(L) to GOST	No
Input ranges (rated values), resistance thermometers
Cu 10	No
Ni 100	Yes; Standard
Input resistance (Ni 100)	10 MΩ
Ni 1000	No
LG-Ni 1000	No
Ni 120	No
Ni 200	No
Ni 500	No
Pt 100	Yes; Standard
Input resistance (Pt 100)	10 MΩ
Pt 1000	No
Pt 200	No
Pt 500	No
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 6000 ohms	No
Thermocouple (TC)
for thermocouples	Type E, J, K, L, N
Temperature compensation
Parameterizable	Yes
internal temperature compensation	Yes
external temperature compensation with compensations socket	Yes
Resistance thermometer (RTD)
Characteristic linearization
for resistance thermometer	Pt100 (standard, climatic range), Ni100 (standard, climatic range)
Characteristic linearization
Parameterizable	Yes
Cable length
Cable length, shielded, max.	200 m; 50 m at 80 mV and thermocouples
Analog value creation
Measurement principle	integrating
Integrations and conversion time/ resolution per channel
Resolution with overrange (bit including sign), max.	15 bit; Unipolar: 9/12/12/14 bits; bipolar: 9 bits + sign/12 bits + sign/12 bits + sign/14 bits + sign
Integration time, parameterizable	Yes; 2.5/ 16.67/ 20/ 100 ms
Basic conversion time, ms	3 / 17 / 22 /102 ms
Interference voltage suppression for interference frequency f1 in Hz	400 / 60 / 50 / 10 Hz
Encoder
Connection of signal encoders
for current measurement as 2-wire transducer	Yes
for current measurement as 4-wire transducer	Yes
for resistance measurement with 2-conductor connection	Yes
for resistance measurement with 3-conductor connection	Yes
for resistance measurement with 4-conductor connection	Yes
Errors/accuracies
Operational limit in overall temperature range
Voltage, relative to input area	+/- 1 %; +/-1% (80 mV); +/-0.6% (250 to 1000 mV); +/-0.8% (2.5 to 10 V)
Current, relative to input area	+/- 0,7 %; From 3.2 to 20 mA
Impedance, relative to input area	+/- 0,7 %; 150, 300, 600 Ohm
Resistance-type thermometer, relative to input area	+/- 0,7 %; +/-0.7% (Pt100/ Ni100); +/-0.8% (Pt100 climate)
Basic error limit (operational limit at 25 °C)
Voltage, relative to input area	+/- 0,6 %; +/-0.4% (250 to 1000 mV); +/-0.6 % (2.5 to 10 mV); +/-0.7 % (80 mV)
Current, relative to input area	+/- 0,5 %; 3.2 to 20 mA
Impedance, relative to input area	+/- 0,5 %; 150, 300, 600 Ohm
Resistance-type thermometer, relative to input area	+/- 0,6 %; +/-0.5% (Pt100/ Ni100); +/-0.6% (Pt100 climate)
Isochronous mode
Isochronous operation (application synchronized up to terminal)	No
Interrupts/diagnostics/status information
Alarms
Diagnostic alarm	Yes; Parameterizable, channels 0 and 2
Limit value alarm	Yes; Parameterizable
Diagnostic messages
Diagnostic functions	Yes; Parameterizable
Diagnostic information readable	Yes
Diagnostics	Yes
Diagnostics indication LED
Group error SF (red)	Yes
Galvanic isolation
Galvanic isolation analog inputs
between the channels	No
between the channels and the backplane bus	Yes
Isolation
Isolation checked with	500 V DC
Connection method
required front connector	20-pin
Dimensions
Width	40 mm
Height	125 mm
Depth	120 mm
Weight
Weight, approx.	250 g

Measurement types and ranges
Introduction
Module SM 331; AI 8 x 12 Bit has measuring range modules
The measurement type and range is configured at the "measuring range" parameter in STEP 7.
The default setting of the module is "voltage" measurement with "± 10V" range. You can use these default settings without having to program the SM 331; AI 8 x 12 Bit in STEP 7.
Measuring range modules
You may have to change the position of the measuring range modules to suit the measurement type and range (see the chapter Setting the measuring types and ranges of analog input channels ).

The necessary settings are also available on the module's imprint. Mark the position of the measuring range module on the front door.

Additional information on SM 331; AI 8 x 12 Bit
Unused channels
As certain programmed inputs may remain unused due to the channel group configuration,make allowances for the special features of these inputs outlined below in order to be able to use the diagnostics functions at these used channels:
● Voltage measurement (except 1 V to 5V) and for thermocouples: Short-circuit unused channels and connect these with MANA. This optimizes interference immunity of the analog input module. Set the "disabled" value at the "measurement type" parameter for unused channels. This setting reduces module cycle times. Also short-circuit the COMP input if this is not used.
● Measuring range 1 V to 5 V: wire the used and unused inputs of the same channel group in parallel.
● Current measurement, 2-wire transducer: There are two options of wiring the channel circuit.
a) Open unused input; channel group diagnostics disabled. If you were to enable diagnostics, the analog module would trigger a single diagnostic interrupt, and light up its SF LED.
b) Loading the unused input using a 1.5 kΩ to 3.3 kΩ resistor. This allows you to enable diagnostics for this channel group.
● Current measurement 4 mA to 20 mA, 4-wire transducer: wire the unused inputs of the same channel group in series.

All channels deactivated
If you disable all input channels of the module and enable diagnostics at the parameters of SM 331; AI 8 x 12 Bit, the module does not report "external auxiliary voltage missing."

Line continuity check for the 4 mA to 20 mA measuring range
If you configured a measuring range of 4 mA to 20 mA, and enabled the line continuity check, the analog input module logs a wire-break event to diagnostics data when the current drops below 3.6 mA.
The module also triggers a diagnostics interrupt if this function is enabled in the program.A wire break can only be signaled by means of the lit SF LED and the diagnostic bytes must be evaluated in the user program if diagnostics interrupts are disabled.
If you configured a measuring range of 4 mA to 20 mA, disabled the line continuity check,and enabled diagnostic interrupts, the module triggers a diagnostic interrupt when the underflow value is reached.

Line continuity check
The line continuity check is designed only for temperature measurements (thermocouples and thermoresistors.)

USER'S manual PDF of 331-7KF02, please refer from Page 370- Page 385:

S7-300 Modules data & USER'S MANUAL

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Description: S7-300 Analog input module
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Technical data sheet of our SM 331  6ES7331-7KF02-0AB0

Picture of 6ES7331-7KF02-0AB0

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