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As a junior engineer inheriting a 15-year-old Siemens S7-300 system, what's the most critical documentation gap you should address immediately before making any modifications?

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Hey there! As someone who's been in your shoes before, I totally get the anxiety of inheriting an older system. With a 15-year-old Siemens S7-300, the single most critical documentation gap you need to address immediately is the safety and interlock documentation.

Think about it this way: that system has been running for over a decade, and there are probably undocumented safety interlocks, emergency stop conditions, and protective sequences that someone added over the years. Before you touch anything, you absolutely need to understand what keeps the system safe and what could cause dangerous situations if modified incorrectly.

Here's what I'd do first: track down any existing safety documentation, talk to experienced operators who know the system's quirks, and map out all the emergency shutdown sequences. Without this knowledge, you could accidentally disable a critical safety feature or create a hazardous condition. Safety first, always!

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