Siemens Simatic S7-200 System Manual page 367

Configuration for EM 235
Table A-19 shows how to configure the EM 235 module using the configuration DIP switches. Switches 1
through 6 select the analog input range and resolution. All inputs are set to the same analog input range
and format. Table A-20 shows how to select for unipolar/bipolar (switch 6), gain (switches 4 and 5), and
attenuation (switches 1, 2, and 3). In these tables, ON is closed, and OFF is open.
Table A-19 EM 235 Configuration Switch Table to Select Analog Range and Resolution
Unipolar
SW1 SW2 SW3
ON OFF OFF
OFF ON OFF
ON OFF OFF
OFF ON OFF
ON OFF OFF
ON OFF OFF
OFF ON OFF
SW1 SW2 SW3
ON OFF OFF
OFF ON OFF
OFF OFF ON
ON OFF OFF
OFF ON OFF
OFF OFF ON
ON OFF OFF
OFF ON OFF
OFF OFF ON
Table A-20 EM 235 Configuration Switch Table to Select Unipolar/Bipolar, Gain, Attenuation
EM 235 Configuration Switches
SW1 SW2 SW3 SW4
OFF
OFF
ON
ON
ON OFF OFF
OFF ON OFF
OFF OFF ON
SW4 SW5 SW6
ON OFF ON
ON OFF ON
OFF ON ON
OFF ON ON
OFF OFF ON
OFF OFF ON
OFF OFF ON
Bipolar
SW4 SW5 SW6
ON OFF OFF
ON OFF OFF
ON OFF OFF
OFF ON OFF
OFF ON OFF
OFF ON OFF
OFF OFF OFF
OFF OFF OFF
OFF OFF OFF
Unipolar/Bipolar Unipolar/Bipolar
Select
SW5 SW6
ON Unipolar
OFF Bipolar
OFF
ON
OFF
ON
Technical Specifications Appendix A
Full-Scale Input Resolution
12.5 mV
0 to 50 mV
25 mV
0 to 100 mV
125 mV
0 to 500 mV
250 mV
0 to 1 V
0 to 5 V 1.25 mV
5 mA
0 to 20 mA
0 to 10 V 2.5 mV
Full-Scale Input Resolution
12.5 mV
+25 mV
25 mV
+50 mV
50 mV
+100 mV
125 mV
+250 mV
250 mV
+500 mV
500 mV
+1 V
+2.5 V 1.25 mV
+5 V 2.5 mV
+10 V 5 mV
Gain Select Attenuation Select
x1
x10
x100
invalid
0.8
0.4
0.2
A
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