Siemens S7-200PLC analog data format - Database & Sql Blog Articles

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Since the analog output modules of the S7-200 need to occupy two output channels. Even if the first module has only one output, AQW0, the output address of the second module should be addressed starting from AQW4 (AQW2 is occupied by the first module), and so on. So naturally there will be no output.

In the S7-200, the unipolar analog input/output signal has a value range of 0 - 32000; the bipolar analog signal has a value range of -32000-+32000.
format:
Input: AIW [start byte address] - such as AIW6
Output: AQW [start byte address] - such as AQW0
Each analog input module is addressed to the back row address in a fixed incremental order, in order of the modules and the number of input channels. For example: AIW0, AIW2, AIW4, AIW6, AIW8, etc.
For the EM231 RTD (thermal resistance) two-channel input module, no more empty channels are used, and the subsequent analog input points are immediately followed by the row address. The temperature analog input modules (EM231 TC, EM231 RTD) are also addressed as described above, but the data read is 10 times the temperature measurement (Celsius or Fahrenheit). For example, 520 is equivalent to 52.0 degrees.
Note: If you are not sure, you can detect the starting address of the module online by reading it in the menu "plc > Information" in STEP 7-Micro/WIN.
About the analog module of the Siemens S7-200, there are 2 people (especially beginners) who need to pay attention:
1. Regarding the address, the address of the S7-200 is very simple. It is related to the relative position. Each analog input module is fixed according to the order of the modules, and the order is backward. You can view it online through the programming software information menu; you need to pay attention to the address is even number, such as AIW0 AIW2, absolutely no AIW1, etc., the output address also needs attention, for example, EM235 has only 1 channel output, but takes 2 Address, the next module must be outputted by an address, for example, there are two connected EM235s next to the CPU, then the analog output addresses are AQW0 and AQW4 respectively;
2. Regarding the DIP switch, different DIP switches correspond to different measurement methods, the nature of the physical quantity, etc. The most important thing to note here is that the DIP switch must be powered off and then powered on again. Also note that the DIP switch is active for all channels simultaneously.