Input Block Diagram For Em 231 And Em 235 - Siemens SIMATIC S7-200 System Manual

Input Block Diagram for EM 231 and EM 235

Figure A-22 shows the EM 231 and EM 235 input block diagrams.
A+
R
RA C
C
Rloop C
A-
R
B+
R
RB
C
C
Rloop
C
B-
R
C+
R
RC C
C
Rloop
C
C-
R
D+
R
C
RD
C
Rloop
C
D-
R
MUX 4 to 1
Input filter
A+
R
RA
C
C
Rloop
C
A-
A=1
R
B+
R
RB
C
C
Rloop
C
B-
A=2
R
C+
R
C
RC
C
Rloop
C
C-
A=3
R
D+
R
RD
C
C
Rloop
C
D-
A=4
R
Input filter MUX 4 to 1
Figure A-22 EM 231 and EM 235 Input Block Diagram
S7-200 Programmable Controller System Manual
A5E00066097-02
EM 231
A=1
+
Instrumentation
AMP
-
A=2
A=3
A=4
EM 235
+
Instrumentation
AMP
-
REF_VOLT
+
Buffer
-
Offset Adjust
S7-200 Specifications
GAIN ADJUST
BUFFER
11
GAIN ADJUST
BUFFER
A/D Converter
11
A/D Converter
0
DATA
0
A-45