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When working with the analog output modules of the S7-200, it's important to note that each module requires two output channels. Even if a module only has one output, like AQW0, the next module will start at AQW4, since AQW2 is already occupied. This means that if you're not careful, you might end up with no output at all.
The S7-200 handles analog signals in specific ranges. For unipolar signals, the range is 0 to 32000, while bipolar signals range from -32000 to +32000. When addressing these signals, the format is as follows:
- Input: AIW [start byte address], for example, AIW6
- Output: AQW [start byte address], for example, AQW0
Each analog input module is assigned addresses in a fixed order based on the module's position and the number of input channels. For example, AIW0, AIW2, AIW4, AIW6, and so on. The EM231 RTD (thermal resistance) module uses its channels directly without leaving any empty slots, meaning the next available address follows immediately after. Similarly, the EM231 TC module also follows this pattern, but the data read is ten times the actual temperature measurement—so 520 would represent 52.0 degrees Celsius or Fahrenheit.
If you're unsure about the starting address of a module, you can check it online using the "PLC > Information" menu in STEP 7-Micro/WIN. This is especially useful when dealing with multiple modules or when troubleshooting.
There are two key points that beginners should pay special attention to when working with analog modules in the S7-200:
- Addressing: The S7-200 assigns addresses based on the module's position. Each analog input module is placed in a backward sequence, and the addresses are always even numbers, such as AIW0, AIW2, etc. There are no odd-numbered addresses like AIW1. For outputs, even a single-channel module like the EM235 occupies two addresses. If two EM235 modules are connected, their output addresses would be AQW0 and AQW4, respectively.
- DIP Switch Settings: Different DIP switch configurations correspond to different measurement modes and physical quantities. It's crucial to remember that the DIP switch must be reset by powering off and then on again. Also, the settings apply to all channels simultaneously, so changing the configuration affects the entire module.
Understanding these details can help prevent errors and ensure accurate signal processing in your S7-200 system. Always double-check the address assignments and DIP switch settings before deploying your application.
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