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SIMATIC S7-400, SM 431

technical data

		SIMATIC S7-400, analog input SM 431, potential isolation 8 analog input; Resolution 14-bit U/I/resistor 8 analog input, cycle time 0.416 MS
power supply voltage
load voltage L +
● rating (DC)		24V; Only when supplying power to the two-wire measuring converter
● reverse polarity protection		yes
input current
from load voltage L + (no load), maximum		200 mA; When 8 connected and fully controlled two-wire measuring frequency converter
DC 5V from backplane bus, maximum		1 000 mA
power loss
power loss, typical		4.9W
analog input
number of analog inputs		8
● voltage/current measurement		8
● When measuring resistance		4
voltage input allowed input voltage (damage limit), maximum		18V; 18V continuous voltage, 75V within 1 ms (duty cycle 1:20)
current input allowable input current (damage limit), maximum		40 mA; Continuous voltage
input range
● voltage		yes
● Current		yes
● thermocouple		no
● Resistance thermometer		no
● Resistance		yes
input range (rated value), voltage
● 1V to 5V		yes
● input resistance (1V to 5V)		10 M?
● -1v to +1v		yes
● input resistance (-1V to +1V)		10 M?
● -10V to +10V		yes
● input resistance (-10V to +10V)		100 k?
Input range (rated value), current
● -20 mA to +20 mA		yes
● input resistance (-20 mA to +20 mA)		50?
● 4 mA to 20 mA		yes
● input resistance (4 mA to 20 mA)		50 k?
Input range (rated value), resistance
● 0 to 600 ohm		yes
wire Length
● shielding, maximum		200 m
analog value composition at input
integration and conversion time/resolution per channel
● resolution with overmodulation (digits including symbols), maximum		14 bit; 14 / 14 / 14
● parameterized integration time		yes
● Basic conversion time (ms)		52 µs
● suppression of interference voltage at interference frequency f1 (unit Hz)		none/400/60/50Hz
sensor
signal sensor connection
● used for voltage measurement		yes; Possible
● current measurement as a two-wire measuring transmitter		yes
● current measurement as a four-wire measuring transmitter		yes
● For resistance measurement using two-wire interface		yes; Cable resistance is measured together
● Resistance measurement using three-wire interface		yes; Cable resistance is measured together
● Resistance measurement using four-wire interface		yes
error/precision
operating error limits over the entire temperature range
● voltage, related to the input range,(+/-)		0.7 %; ± 0.7% at ± 1V; ± 0.9% at ± 10V; 1 to 5V
● Current, related to the input range,(+/-)		0.8 %; ± 20 mA, 4 to 20 mA
● Resistance, related to the input range,(+/-)		1%
basic error limit (Operation error limit at 25°C)
● voltage, related to the input range,(+/-)		0.6 %; 0.6% at ± 1V; 0.75% at ± 10V; 1 to 5V
● Current, related to the input range,(+/-)		0.7 %; ± 20 mA, 4 to 20 mA
● Resistance, related to the input range,(+/-)		0.7 %; 0 to 600 ohm
potential isolation
analog Input potential isolation
● analog input potential isolation		yes; Internal/external
● between channels		no
insulation
insulation Test, use		2120V DC is between bus and analog components; 500V DC is between bus and location ground; 500V DC is between analog components and L +/M; 2120V DC is between analog components and location ground; 2120V DC between L +/M and location ground
size
width		25 mm
height		290 mm
depth		210 mm
weight
weight, about		500g

Update time：20240922223310