I have a question about DCS logic and would like to ask an expert
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Regarding the image below, what does the area marked in the upper right corner mean? There’s already logic for opening the valve; so how should we understand the situation where opening this valve fails? Thank you!!!
Action point: On. If no signal to turn on is received after 5 seconds, an alarm is triggered; Action point: Off. If no signal to turn off is received after 5 seconds, an alarm is triggered
My understanding is that once the interlock logic issues a command to open or close the valve, and no signal indicating that the valve has reached its desired position is received within the specified time frame, an alarm or interlock signal is generated to trigger further actions
Thank you, boss. What this means is that the command was sent, but there was no feedback. Will there be a failure alarm on the DCS? In this case, is the valve in the open or closed state? Thank you for your hard work, boss
The failure to receive feedback could be due to a feedback error related to the valve being open, or it could be a valve malfunction; in either case, it will trigger an alarm indicating failure to open in the DCS system
The area circled in the upper right corner of the image represents the logic for failed valve opening. If there were previously actions or commands to open the valve, this logic is used to check whether the valve was opened successfully. If the valve does not open as expected, a series of corrective actions may be triggered, such as generating an alarm, attempting to open the valve again, or performing other safety-related actions to ensure the safety and proper operation of the system. .
You’re welcome! Feel free to ask more questions if you have any I hope this can help you. .