Em 235 Configuration Switch Table To Select Unipolar/Bipolar, Gain, And Attenuation; Input Data Word Format For Em 231 And Em 235 - Siemens SIMATIC S7-200 System Manual

S7-200 Specifications
Table A-14
EM 235 Configuration Switches
SW1 SW2
ON OFF
OFF ON
OFF OFF

Input Data Word Format for EM 231 and EM 235

Figure A-21 shows where the 12-bit data value is placed within the analog input
word of the CPU.
Figure A-21
Note
The 12 bits of the analog-to-digital converter (ADC) readings are left-justified in
the data word format. The MSB is the sign bit: zero indicates a positive data
word value. In the unipolar format, the three trailing zeros cause the data word to
change by a count of eight for each one-count change in the ADC value. In the
bipolar format, the four trailing zeros cause the data word to change by a count
of sixteen for each one count change in the ADC value.
A-44
EM 235 Configuration Switch Table to Select Unipolar/Bipolar, Gain, and
Attenuation
SW3 SW4 SW5
OFF OFF
OFF ON
ON OFF
ON ON
OFF
OFF
ON
MSB
15 14
Data value12 Bits
AIW XX 0
Unipolar data
MSB
15
AIW XX Data value
Bipolar data
Input Data Word Format for EM 231 and EM 235
Unipolar/Bipolar Unipolar/Bipolar
Select
SW6
ON Unipolar
OFF Bipolar
4
12 Bits
S7-200 Programmable Controller System Manual
Attenuation Attenuation
Gain Select Gain Select
Select
x1
x10
x100
invalid
0.8
0.4
0.2
LSB
3 2 0
0 0 0
LSB
3 0
0 0 0 0
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