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Expansion Modules for Two S7-200 PLC expansion modules are available for accurate
Temperature Measurement temperature measurement,
EM 231 Thermocouple module
and EM 231 RTD module.
EM 231 Thermocouple module provides analog inputs for
thermocouples. A thermocouple is a temperature sensor
made from two dissimilar metals joined at a point called a
junction. A thermocouple produces a small voltage that is
dependent upon temperature. Various types of thermocouples
are available for use in different temperature ranges. Two
versions of EM 231 Thermocouple modules are available, one
for four thermocouples and one for eight thermocouples. Each
version is compatible with J, K, T, E, R, S, or N thermocouples,
but the thermocouples used with a specific module must be of
the same type.
EM 231 RTD module provides analog inputs for
resistance
temperature detectors (RTDs). An RTD is a temperature
sensor made from a metal, such as platinum, nickel, or copper,
that varies in resistance in a predictable manner as temperature
varies. Two versions of the EM 231 RTD module are available,
one with two analog inputs and one with four analog inputs.
Either version can be used with a variety of RTD types, but the
RTDs used with a specific module must be of the same type.
S7-200 PLC with EM 231 Expansion Module
PORT
0
SF/DIAG
RUN
STOP
SIMATIC
S7 - 200
.0
00
.1 .2 .3 .4 .5 .6 .7 .0 .1
01
.0
.1
.2 .3 .4
.5
.6 .7 .0
.1
.2 .3 .4
.5
I0 I1
CPU 224
AC/DC/RLY
243-
7PD2
2-0XA
0
+24
VDC
SF
EM 2
31
AI4
-
TC
EM 231 Thermocouple module, 4 Input Version
A+ A-
B+ B- C+
C- D+ D-
-
+
24 VDC
M
L+
Configuration
A+ A-
a+ a- B+
B- b+ b-
-
+
24 VDC
M
L+
Configuration
EM 231 RTD module, 2 Input Version
Refer to the S7-200 Programmable
Controller System Manual for
Configuration DIP Switch Positions
Refer to the S7-200 Programmable
Controller System Manual for
Configuration DIP Switch Positions
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