II - DCE FEL ČVUT v Praze

SIMATIC S7 HART Analog Modules
SM 331;AI 2 x 0/4...20 mA HART
Dimensions and weight
Dimensions W x H x D (mm) 40 x 125 x 120
Weight approx. 260 g
Module-specific data
Number of inputs
2
Number of power outputs 2
Line length, shielded max. 400 m
Type of protection KEMA
(see Appendix A)
4-18
[EEx ib] IIC to
EN 50020
KEMA test number 97ATEX3039 X
Voltages, currents, potentials
Bus power supply
Rated load voltage L +
Reverse voltage protection
5 V DC
24 V DC
yes
Power supply for 2-wire
transducer
Short-circuit proof yes (approx. 30 mA)
Galvanic isolation
Between channels and
backplane bus
yes
Between the channels yes
Between channels and load
voltage L+
yes
Between backplane bus
and load voltage L+
yes
Permissible difference in potential (UISO) for signals
from a hazardous area
Between channels and
backplane bus
Between channels and load
voltage L+
60 V DC
30 V AC
60 V DC
30 V AC
Between channels 60 V DC
30 V AC
Between backplane bus
and load voltage L+
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 load
voltage L+
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+
75 V DC
60 V AC
Insulation tested
Channels to backplane bus
and load voltage L+
with 1500 V AC
Channels to each other with 1500 V AC
Between load voltage L+
and backplane bus
with 500 V DC
Current input
From backplane bus
From load voltage L +
max. 100 mA
max. 180 mA
Module power loss typically 4.5 W
Safety data (see 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. 29.6 V
I0 (short-circuit current) max. 99 mA
P0 (load power) max. 553 mW
L0 (permissible external
inductance)
max. 3 m
C0 (permissible external
capacitance)
max. 62 nF
Um (error voltage) max. 250 V DC
Ta (permissible ambient
temperature)
0 to 60C
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04