Siemens SIMATIC S7-200 System Manual page 439

EM 231 Analog Input Thermocouple, 4 Inputs
(6ES7 231- -7PD22- -0XA0)
+ -- + -- + --
A+ A - - B+ B- - C+ C- - D+
EM 231
AI 4
M L+
+
- -
24 VDC
power
EM 231 Analog Input RTD, 2 Inputs
(6ES7 231- -7PB22- -0XA0)
A+ A - - a+ a- - B+ B- - b+ b- -
EM 231
AI 2 x RTD
M L+
+
- -
24 VDC
power
Figure A-23 Connector Terminal Identification for EM 231 Thermocouple and EM 231 RTD Modules
Compatibility
The RTD and Thermocouple modules are designed to work with the CPU 222, CPU 224,
CPU 224XP and CPU 226.
+ --
D- -
Configuration
Configuration
Technical Specifications
EM 231 Analog Input Thermocouple, 8 Inputs
(6ES7 231- -7PF22- -0XA0)
EM 231 Analog Input RTD, 4 Inputs
(6ES7 231- -7PC22- -0XA0)
Appendix A
425