Regarding chain logic
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What is the purpose of the logical function of the “Manual/Automatic selection switch” located below the image?
This depends on your configuration logic, rather than the logical diagram shown in the flowchart.
It’s not possible to tell from the diagram where the latter half of the automatic switch for your hand control is located. However, based on experience, in most cases a chain reaction requires an automatic mode in order to function; in emergency situations, it can be switched to manual mode to prevent accidents. Of course, there are also chain reactions that do not allow for such a switch – these types of chain reactions are very important. For details, please refer to the chain reaction logic diagram; the design team will draw up this diagram in accordance with the process control requirements
What the friend on the 7th floor said makes sense, but I always feel that this way of representing series connections with manual and automatic switches isn’t very appropriate
The manual/automatic selection switch may serve as a bypass, that is, it bypasses the interlock conditions prior to ADN (used during testing, start-up/shutdown, and other special situations)
The manual/auto selection switch serves as a bypass