In the SIS of Zhejiang University Zhongkong, the RS flip-flops are reset using the S terminal

This setting is likely intended to ensure that the system can quickly return to a safe state under specific conditions, thereby preventing system abnormalities caused by incorrect operations or failures. .

In the SIS (Safety Instrumented System) of Zhejiang University Zhongkong, RS flip-flops use the S terminal (Set terminal) as the reset terminal, and this design is relatively rare. Typically, an RS flip-flop uses the R terminal (Reset terminal) for reset operations. The use of S-terminal reset may be based on the following considerations: 1. **Special logical requirements**: In certain logical control scenarios, designers may wish to use specific signal lines to simultaneously perform setting and reset functions, in order to simplify the control logic or reduce the number of pins required. 2. **System simplification**: Using S-side reset can help simplify system design, making the circuits or programs more intuitive and easier to maintain. 3. **Error protection**: In some cases, using the S terminal for reset can prevent misoperations or design errors, thereby enhancing the security of the system. 4. **Technological innovation**: Involves innovating traditional circuit designs based on certain new technical considerations or unique application requirements. The specific use cases and reasons may require a deeper understanding through detailed system design documentation or by communicating with the design team. .

You need to post the program; I haven’t worked with SIS. An RS flip-flop is a command for setting or resetting the state; when the R terminal is active, the output is reset, and when the S terminal is active, the output is set. When both are ON at the same time, S setting takes precedence, and the output is set. When both are OFF, the output remains.