Interlock not resolved

I know a little about it, but I doubt I can explain it to you clearly. I hope an expert will step in

http://bbs.hcbbs.com/thread-490144-1-1.html

Priority of setting refers to the state that is implemented when both the setting and reset inputs are 1; with priority of setting, the output is 1, while with priority of reset the output is 0. A NOT gate essentially performs inversion

This post was last edited by HEJIYUER on 2016-2-1 23:47. As a practical example, when the liquid level is too high, an interlock mechanism is triggered to close the feed valve. 1. Priority to setting: LAH–the valve is closed. When you press the reset button (resetting means opening the valve), if LAH is still present, then the valve cannot be opened (because LAH is in a set state and takes precedence). Be sure to wait until LAH disappears before pressing reset to open the valve. 2. Reset takes priority; commonly known as forced reset LAH – the valve is closed. When you press reset (reset means opening the valve), the valve opens regardless of whether LAH is present or not (because reset takes precedence). In actual interlock designs, \"set priority\" is generally used, because once an interlock is triggered, it is necessary to wait until the interlock input disappears before the interlock can be reset, allowing the process to resume operation; otherwise, accidents may occur. Priority setting is also useful, for example in the logical design of alarm panels: (not for process interlock design) 1. When interlock is triggered, the alarm horn sounds. By pressing “Mute” = reset, the horn will stop sounding; otherwise it will continue to ring ； This is a robber reset. 2. However, for interlock alarm lights, a design with priority given to keeping them activated should be used; as long as there is an interlock input, pressing the reset button on the control panel will not cause the alarm lights to go off – it’s necessary that they remain lit. Because the status of the alarm light must match the actual situation on site, forced reset cannot be used, otherwise it will mislead the operators. . . Take a NAND gate as an example: The compressor can only be started once the lubricating oil has reached a certain temperature, but we usually only install a low-temperature alarm, TAL. In the driving logic, the alarm indicated on the screen is TAL, but the condition for driving is: NOT TAL; therefore, add a NOT gate to the TAL input to use it as the driving condition. @jiaguoyun @budaoweng123 @Big Horse with a Big Bow

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