Siemens SIMATIC S7-200 System Manual page 445

EM 231 RTD Module
The EM 231 RTD module provides a convenient interface for the S7-200 family to several different
RTDs. It also allows the S7-200 to measure three different resistance ranges. All RTDs attached
to the module must be of the same type.
Configuring the EM 231 RTD Module
DIP switches enable you to select RTD type, wiring
configuration, temperature scale, and burnout
direction. The DIP switches are located on the
bottom of the module as shown in Figure A-24. For
the DIP switch settings to take effect, you need to
power cycle the PLC and/or the user 24V power
supply.
Select RTD type by setting DIP switches 1, 2, 3, 4, 5
and 6 to correspond to the RTD as shown in Table and 6 to correspond to the RTD as shown in Table
A-31 and Table A-32. Refer to Table A-33 for other
DIP switch settings.
Table A-31 Selecting the RTD Type: DIP Switches 1 to 6 for the EM 231 Analog Input RTD 4 Inputs
RTD Type and SW1
1
Alpha
100Ω Pt 0.003850 0
(Default)
200Ω Pt 0.003850 0
500Ω Pt 0.003850 0
1000Ω Pt 0.003850 0
100Ω Pt 0.003920 0
200Ω Pt 0.003920 0
500Ω Pt 0.003920 0
1000Ω Pt 0.003920 0
100Ω Pt 0.00385055 0
200Ω Pt 0.00385055 0
500Ω Pt 0.00385055 0
1000Ω Pt 0
0.00385055
100Ω Pt 0.003916 0
200Ω Pt 0.003916 0
500Ω Pt 0.003916 0
1000Ω Pt 0.003916 0
GOST 50Ω Pt 0
0.00385055
GOST 100Ω Pt 0
0.00385055
GOST 500Ω Pt 0
0.00385055
GOST 10Ω Pt 0
0.003910
GOST 500Ω Pt 0
0.003910
GOST 100Ω Pt 0
0.003910
GOST 500Ω Pt 0
0.003910
SW2 SW3 SW4 SW5 SW6
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 0
0 1 0 1 0
0 1 1 0 0
0 1 1 1 0
1 0 0 0 0
1 0 0 1 0
1 0 1 0 0
1 0 1 1 0
1 1 0 0 0
1 1 0 1 0
1 1 1 0 0
1 1 1 1 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 1
0 1 0 0 1
0 1 0 1 1
0 1 1 0 1
0 1 1 1 1
Technical Specifications
Configuration
↑1 -- On
↓0 -- Off
1 2 3
Figure A-24 DIP Switches for the EM 231
RTD Module
RTD Type and SW1 SW2
1
Alpha
100Ω Pt 0.003902 1
200Ω Pt 0.003902 1
500Ω Pt 0.003902 1
1000Ω Pt 0.003902 1
SPARE 1
100Ω Ni 0.00672 1
120Ω Ni 0.00672 1
1000Ω Ni 0.00672 1
100Ω Ni 0.006178 1
120Ω Ni 0.006178 1
1000Ω Ni 0.006178 1
10000Ω Pt 1
0.003850
10Ω Cu 0.004270 1
150Ω FS 1
Resistance
300Ω FS 1
Resistance
600Ω FS 1
Resistance
GOST Cu 50Ω 0
0.00426
GOST Cu 100Ω 0
0.00426
GOST Cu 500Ω 0
0.00426
GOST Cu 10Ω 0
0.00428
GOST Cu 50Ω 0
0.00428
GOST Cu 100Ω 1
0.00428
GOST Cu 500Ω 1
0.00428
Appendix A
4 5 6 7 8
SW3 SW4 SW5 SW6
0 0 0 0 0
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 0
0 1 0 1 0
0 1 1 0 0
0 1 1 1 0
1 0 0 0 0
1 0 0 1 0
1 0 1 0 0
1 0 1 1 0
1 1 0 0 0
1 1 0 1 0
1 1 1 0 0
1 1 1 1 0
1 0 1 1 1
1 1 0 0 1
1 1 0 1 1
1 1 1 0 1
1 1 1 1 1
0 0 0 0 1
0 0 0 1 1
431