Siemens Simatic M7-400 Manual de usuario Pagina 308

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Analog Modules
5-92
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Technical Specifications of the SM 431; AI 8 14 Bit
Programming package
Associated programming
package
As of STEP 7 V 2.0
Dimensions and Weight
Dimensions W H D
(in millimeters)
25 290 210
Weight Approx. 500 g
Data for Specific Module
Number of inputs
For resistance-type sensor
8
4
Length of cable
Shielded Max. 200 m
Voltages, Currents, Potentials
Rated load voltage L+ 24 VDC (required only
for the supply of 2-wire
transmitters)
Reverse polarity protection Yes
Power supply of the
transmitters
Supply current Max. 50 mA
Short-circuit proof Yes
Constant measured current for
resistance-type sensor
Typ. 1.67 mA
Isolation
Between channels and
backplane bus
Between the channels
Between channels and
load voltage L+
Yes
No
Yes
Permitted potential difference
Between inputs and M
ANA
(U
CM
)
8 VAC
Between the inputs (E
CM
) 8 VAC
Between M
ANA
and
M
internal
(U
ISO
)
75 VDC/60 VAC
Insulation tested
Between bus and analog
section
Between bus and chassis
ground
Between analog section
and L+/M
Between analog section
and chassis ground
Between L+/M and chassis
ground
2120 VDC
500 VDC
707 VDC
2120 VDC
2120 VDC
Current consumption
From the backplane bus Max. 1000 mA
From the backplane bus L+ Max. 200 mA (with 8
connected, fully
controlled 2-wire
transmitters)
Power dissipation of the
module
Typ. 4.9 W
Analog Value Generation
Measuring principle Actual-value
conversion
Integration time/conversion
time/resolution (per channel)
(Does not go into the
response time)
Parameters can be
assigned
Yes
Interference voltage
suppression f1 in Hz
None/400/60/50
Basic conversion time in
ms
52 s
Resolution (incl.
overrange)
14/14/14
Smoothing of the measured
values
Can be parameterized
“none – a lot”
Time constant of the input
filter
15 s
Basic execution time of the
module, in ms (all channels
enabled)
0.420
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