Siemens Simatic S7-400 - Manual (Page 295)

Analog Modules
5-79
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
in the 80 mV input range
and with thermocouples Max. 200 m
Max. 50 m
Voltages, Currents, Potentials
Rated load voltage L+ 24 VDC (required only
for the supply of
two-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
)
120 VAC
•
Between the inputs (E
CM
) 120 VAC
•
Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with
•
Between bus and L+/M
•
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
2120 VDC
500 VDC
707 VDC
2120 VDC
2120 VDC
Current consumption
•
From the backplane bus Max. 600 mA
•
From the backplane bus L+ Max. 200 mA (with 8
connected, fully
controlled two-wire
transmitters)
Power dissipation of the
module Typ. 3.5 W
Analog Value Generation
Measuring principle Integrative
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 60/50
•
Integration time in
milliseconds 16.7/20
•
Basic conversion time in
ms 20.1/23.5
•
Additional conversion time
for measuring resistance in
ms 40.2/47
•
Additional conversion time
for open-circuit monitoring
in ms 4.3/4.3
•
Additional conversion time
for measuring resistance
in ms 5.5/5.5
•
Resolution including sign
– Smoothing activated
14/14 bit
16/16 bit
Smoothing of the measured
values Parameters can be
assigned in 4
stages
Basic execution time of the
module, in ms (all channels
enabled) 161/188