Can the emergency stop hard button on the SIS system’s auxiliary control panel be replaced with a soft button?
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The factory needs to build a new centralized control room; all the existing equipment uses hard buttons on auxiliary control panels. Now, centralized control is required. If the auxiliary control panels are moved directly to the new control room, remote racks would be necessary, which incurs high costs. I would like to ask whether the emergency stop hard button on the SIS system’s auxiliary control panel can be replaced by a soft button on the operation station If not, is there any standard support?
Logically, it’s not possible. The emergency stop button is pressed in emergency situations. Do you still use the mouse? The soft button can only be called a stop button; it cannot be called an emergency stop button.
No. For older devices, it is possible to reconsider optimizing the interlock functions, with some buttons possibly being added or removed.
We don’t go into the control room; there’s an emergency stop button at the auxiliary control panel, and there are also emergency stop buttons on site
No, reset is possible, but emergency stop is not
That’s not possible, right? If the system fails, how can soft starting be used?
Hard wires are more reliable, while soft wires have more limitations.
Shouldn’t this matter be handed over directly to the designers? Petroleum industry standards don’t mention this much; chemical industry standards require that buttons be used wherever safety interlocks are involved. For reset testing, a soft button can be used. I think setting up those emergency stop buttons is the real hassle. It involves many things, such as the production process, safety, and so on.
The last edit to this post was made by fpiliuwei on 2019-5-6 at 14:52. 1. From the perspective of design engineers, they would never take responsibility for any issues that arise from changing hard buttons to soft buttons; in other words, the design team won’t take such a risk and create a design of that kind for you. 2. In terms of the function of a hard button, it depends on the level of importance of that button. If it was designed to be a hard button out of conservatism, then it can naturally be changed to a soft button. But if SIS interlocks or the patent holder explicitly require interlocks, whoever makes the change will be held responsible; I certainly won’t take that responsibility. To put it simply, the instrument does all the work related to the process – then what’s the purpose of the process itself? Let them decide on the hard and soft buttons; the gauge’s job is just to function. Don’t take matters into your own hands, as it will only result in effort with no reward.