DCS program control issues
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Gentlemen, I’m facing a challenge in DCS configuration: there are 5 tanks, A, B, C, D, and E. Feeding starts to tank A; once it’s full, feeding to A stops and feeding to tank B begins. This process continues until tank D is full, after which feeding to tank E starts. At the same time, once the settling time for tank A is up, its discharge valve is opened. Once tank E is full, open the feed valve for tank A; once that is full, open the feed valve for tank B, and so on in a cyclic manner. But if any of the cans need to be removed from this automatic cycle due to printing issues, while the rest of the cans should continue with this process, how should this be done? Automatic control instruments
The control logic of DCS can be used to achieve this function. The control signals for the feed and discharge valves of each tank can be linked to a respective \"switch.\" When a tank needs to be shut down, the switch corresponding to that tank can be turned off, thereby stopping the feeding and discharging operations for that tank. Meanwhile, the other tanks can still operate according to the original cycling program. It should be noted that when operating the removal tank, consideration must be given to the feeding and discharging processes in order to avoid unnecessary safety hazards. .
Just remove that jar: lol
This post was last edited by jlshnlhj on 2023-10-15 08:13. According to the description: once tank x is full, start timing; when the settling time is up, open the discharge valve of tank x. It has nothing to do with the other tanks. The key is to feed in sequence. A-B-C-D-E-A...... R:1 cycle, 0 cut ； F: 1 tank full, 0 tanks empty ； I:1 feeding conditions are met, 0 feeding conditions are not met. The figure below shows the logic for meeting the feed conditions of Tank B.
Well, that makes sense. Thank you for the help!
For sequential control, a choice is made as to whether each tank should be activated or not; if 0 is selected, it is skipped directly, while if 1 is selected, the process proceeds with that tank.
Add a control bypass to each tank. Previously, the condition for starting the next one was met only after the previous one had started; now, by adding a bypass that becomes active as soon as the previous one is shut down, this should work. In other words, once the one before that finishes its operation, the bypass takes over, allowing the one after it to start