II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Analog Modules
Influencing by
HART signals
Analog Input SM 331; AI 4 x 0/4...20 mA
Dimensions and Weight
Dimensions W x H x D (mm) 40 x 125 x 120
Weight approx. 290 g
Module-specific data
Number of inputs 4
Line length, shielded max. 200 m
Type of protection PTB
(see Appendix A)
3-66
If transducers with HART protocol are used, integration times of 16 2 /3, 20 or
100 ms should preferably be parameterized in order to maintain the influence
on the measurement signal by the modulated alternating current as low as
possible.
[EEx ib] IIC
to EN 50020
Test number Ex-96.D.2092 X
Type of protection FM
(see Appendix B)
Voltages, currents, potentials
Bus power supply
Rated load voltage L+
Reverse voltage protection
Power supply of transducers
short-circuit-proof
CL I, DIV 2,
GP A, B, C, D T4
5 V DC
24 V DC
yes
yes
Isolation
Between channels and
backplane bus
yes
Between channels and load
voltage L+
yes
between channels yes
Between backplane bus
and load voltage L+
yes
Permissible difference in potential (UISO) of signals
from hazardous area
Between channels and
backplane bus
60 V DC
30 V AC
between channels 60 V DC
30 V AC
Between channels and load
voltage L+
Between backplane bus
and load voltage L+
60 V DC
30 V AC
60 V DC
30 V AC
Voltages, currents, potentials continued
Permissible difference in potential (UISO) for signals
from non-hazardous area
between channels and
backplane bus
between channels and
backplane bus
400 V DC
250 V AC
400 V DC
250 V AC
Between channels 400 V DC
250 V AC
Between backplane bus
and load voltage L+
Insulation tested
Channels with respect to
backplane bus and load
voltage L+
Channels among each
other
Backplane bus with respect
to load voltage L+
Current input
from backplane bus
from load voltage L+
75 V DC
60 V AC
with 1500 V AC
with 1500 V AC
with 500 V DC
max. 60 mA
max. 150 mA
Module power loss typical 3 W
Safety data (refer to Certificate of Conformity in
Appendix A)
Type of protection to
EN 50020
Maximum values per channel
U0 (no-load output
voltage)
[EEx ib] IIC
max. 25.2 V
I0 (short-circuit current) max. 68.5 mA
P0 (load power) max. 431 mW
L0 (permissible external
inductance)
max. 7.5 m
C0 (permissible external
capacitance)
max. 90 nF
Um (error voltage) max. 60 V DC
30 V AC
Ta (permissible ambient
temperature)
max. 60C
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04