Siemens SIMATIC S7-200 System Manual page 431

Configuration for EM 231
Table A-20 and Table A-21show how to configure the the EM 231 modules using the configuration
DIP switches. All inputs are set to the same analog input range. In these tables, ON is closed,
and OFF is open. The switch settings are read only when the power is turned on.
For the EM 231 Analog Input, 4 Inputs module, switches 1, 2, and 3 select the analog input range
(Table A-20).
Table A-20 Configuration Switch Table to Select Analog Input Range for the EM 231 Analog Input,
4 Inputs
SW1
ON ON
SW1
OFF OFF
For the EM 231 Analog Input, 8 Inputs module, switches 3, 4, and 5 select the analog input range.
Use Switch 1 and 2 to select the current mode input (Table A-21). Switch 1 ON selects current
mode input for Channel 6; OFF selects voltage mode. Switch 2 ON selects current mode input for
Channel 7; OFF selects voltage mode.
Table A-21 EM 231 Configuration Switch Table to Select Analog Input Range for the EM 231
Analog Input, 8 Inputs
SW3
O ON
SW3
OFF OFF
Unipolar
SW2 SW3
OFF ON
ON ON OFF OFF
Bipolar
SW2 SW3
OFF ON
ON OFF
Unipolar
SW4 SW5
OFF ON
ON ON OFF OFF
Bipolar
SW4 SW5
OFF ON
ON OFF
Technical Specifications
Full-Scale Input Full Scale Input Resolution Resolution
0 to 10 V 2.5 mV
0 to 5 V 1.25 mV
0 to 20 mA
Full-Scale Input Full Scale Input Resolution Resolution
±5 V 2.5 mV
± 2.5 V 1.25 mV
Full-Scale Input Full Scale Input Resolution Resolution
0 to 10 V 2.5 mV
0 to 5 V 1.25 mV
0 to 20 mA
Full Scale Input Full-Scale Input Resolution Resolution
±5 V 2.5 mV
± 2.5 V 1.25 mV
Appendix A
5 µA
5 µA
417