A: Why can't I force values in the program during simulation?
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This is a fundamental limitation and is not related to the simulation itself.
There are several key differences between PLCSIM and a real PLC system that may affect the behavior of your program:
1. **Diagnostic Buffer**: Not all error messages that appear in a real PLC can be simulated. For example, messages like "low battery" or "EEPROM error" from the CPU cannot be generated in PLCSIM. However, most I/O-related errors can be simulated.
2. **Input/Output Behavior During Mode Changes**: There is no safe state when changing the operating mode (e.g., from Run to Stop). In a real PLC, certain inputs and outputs may behave differently during these transitions, but this is not accurately reflected in PLCSIM.
3. **FM Modules**: Function modules such as FM 4x or other specialized modules are not supported in PLCSIM, which can lead to unexpected behavior if they are used in the original program.
4. **Peer-to-Peer Communication**: PLCSIM does not support peer-to-peer communication protocols, which are commonly used in real-world PLC applications.
5. **Accumulator Support**: PLCSIM and the 400 CPU support up to 4 accumulators, while older 300 CPUs only have 2. This difference can cause programs that rely on more than 2 accumulators to behave differently when running on PLCSIM compared to a real 300 CPU.
These limitations mean that while PLCSIM is a powerful tool for testing and debugging, it may not perfectly replicate the behavior of a real PLC in all scenarios. If you're experiencing issues with forcing values, it could be due to one or more of these factors. Always test critical logic on a real system before deployment.
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