Those familiar with the central control JX300XP, please come and help
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There are liquid levels in the two towers; one pneumatic valve is used to regulate the liquid level at the outlet. The two towers are generally not operated simultaneously, so a program for switching between liquid level controls is necessary. Two single-loop control modules are required, but should ordinary command buttons be used for the switching? We need to consider the scenario where both towers are in use simultaneously; briefly explain how this can be achieved
Does that mean the outlets of the two towers are combined into one pipe with a valve installed? Then use this valve to adjust the two liquid levels? This isn’t appropriate, is it?
No, it is a valve that controls the liquid level; however, sometimes after switching between the AB towers, it is necessary to implement a program in the software to adjust the liquid level accordingly
So it means there is only one valve, which sometimes needs to be adjusted based on liquid level 1 and sometimes based on liquid level 2, right? Then, a switch that can change the PV value would suffice.
I agree with the view of myface on floor 4; changing the PV value is a simple and effective method.
We cannot consider the situation of using both towers simultaneously. It can only be used manually at the same time.
It can be done this way: create a custom function block. Input pin 1 serves as a switch. Input pin 2 is L1, and input pin 3 is L2. When pin 1 = 0, the output equals the value of input pin 2 (L1); when pin 1 = 1, the output is L2; when pin 1 = 3, the output is the minimum value between pin 1 and pin 2. Next, create buttons on the screen to assign values of 1, 2, and 3 to pin 1; these values correspond to switching control between L1, L2, and L1L2. Since it is an outlet drain valve, it is better to control the liquid level at a low level, and due to the principle of continuity, the higher liquid level will adjust itself to match the lower level.
This post was last edited by hfrs on 2018-12-15 at 13:54. Just use a single circuit; add a SEL module to switch between the two levels. It’s not feasible to control both towers simultaneously. .
Does that mean two circuits aren’t needed? One circuit for Tower A and one circuit for Tower B, then using a selector switch to switch between them? Can a toggle switch be added to both the input and output?
In a single-loop configuration, SV, MV, and AM are all set for Tower A. If the input becomes the liquid level of Tower B, will this affect the loop regulation?
It definitely can’t be added to the output; if it is added to the output, then there must be two thresholds on your screen. But you actually only have one valve. It is prone to causing misunderstandings.