What is the difference in size between the dots on EM231/232, and how to choose?
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As the title suggests, what is the difference in size between the dots on EM222CN and EM231/232CN, and how should one make a choice?
The EM 222 CN is a digital output module with 8 outputs, the EM 232 CN is an analog output module with 2 outputs, and the EM 231 CN is an analog input module with 4 inputs. These are just approximate model names; if you want to place an order, you need Siemens’ order numbers. For example, the EM 231 CN has 3 order numbers, each corresponding to the processing of AI/RTD/TC signals. It is recommended to download the manual from Siemens’ official website.