SIMATIC S7-300, Analog input SM 331, isolated, 8 AI, resolution 14 bit, 0.052 ms/channel current, Voltage alarm, diagnostics, 1x 20-pole, suitable for isochronous mode Improved bus cycle time for isochronous model .
Net Weight (kg)
Place of Origin
12,90 x 14,80 x 5,10
Analog input SM 331
Load voltage L+
● Rated value (DC): 24 V
● Reverse polarity protection: Yes
from load voltage L+ (without load), max.: 50 mA
from backplane bus 5 V DC, max.: 100 mA
Power loss, typ.: 1.5 W
Number of analog inputs: 8
permissible input voltage for voltage input
(destruction limit), max: .20 V; 20 V DC permanent, 75 V DC for max. 1 s (duty factor 1:20)
permissible input current for current input (destruction limit), max.: 40 mA
● Voltage: Yes
● Current: Yes
● Thermocouple: No
● Resistance thermometer: No
● Resistance: No
Input ranges (rated values), voltages
● 0 to +10 V ：No
● 1 V to 5 V: Yes
● Input resistance (1 V to 5 V): 100 kΩ
● -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
● -5 V to +5 V: Yes
● Input resistance (-5 V to +5 V) 100 kΩ
● -500 mV to +500 mV: Yes
● -80 mV to +80 mV: Yes
Input ranges (rated values), currents
● 0 to 20 mA ：Yes
● Input resistance (0 to 20 mA) ：50 Ω
● -20 mA to +20 mA ：Yes
● Input resistance (-20 mA to +20 mA): 50 Ω
● 4 mA to 20 mA: Yes
● Input resistance (4 mA to 20 mA): 50 Ω
● shielded, max. 200 m
Analog value generation for the inputs
Measurement principle Actual value encryption
Integration and conversion time/resolution per channel
● Resolution with overrange (bit including sign),
14 bit; Unipolar: 14 bit; bipolar: 13 bit + sign
● Integration time, parameterizable Yes
● Basic conversion time (ms) 52 µs per channel
● Interference voltage suppression for
interference frequency f1 in Hz
none / 400 / 60 / 50 Hz
Connection of signal encoders
● for current measurement as 2-wire transducer Yes
● for current measurement as 4-wire transducer Yes
● Voltage, relative to input range, (+/-) 0.4 %
● Current, relative to input range, (+/-) 0.3 %
Basic error limit (operational limit at 25 °C)
● Voltage, relative to input range, (+/-) 0.25 %
● Current, relative to input range, (+/-) 0.2 %
Diagnostics function :Yes
● Diagnostic alarm Yes; Parameterizable
● Limit value alarm Yes; Parameterizable, channels 0 and 2
● Diagnostic information readable :Yes
Diagnostics indication LED
● Group error SF (red) :Yes
Potential separation analog inputs
● between the channels and backplane bus Yes
Isolation tested with 500 V DC
required front connector 20-pin
Width 40 mm
Height 125 mm
Depth 117 mm
Weight, approx. 230 g
Our Main Product & Market:
With the company's development, our products are favored by all consumers. And now we have established contact with consumers in a number of countries and long-term cooperation.
Packing & Delivery
1.Do you have the testing equipments and how long is the delivery time?
A:There are professional testing equipments and experienced technicians to support.Delivery time is 3-5 days for most of our products.
2. How about the packing?
A :We usually use enough thick foam boards to fill the inner box for protecting the parts,and mainly use carton to pack the parts, if they are much heavy and easy to be damagedthen customized wooden box will be used.
3. What's your shipment method?
A: We ship by Express, by air, Normally we checked and compare, then provide customer the most proper shipment method.
4.What services can we provide?
A:We provide Good after-sell service,One-Stop Purchasing service and Purchasing agency service .
5.How about the warranty ?
A:We supply 1 year warranty.