Remote issue with emergency stop switch
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I’m seeking advice from everyone: At present, the DCS cabinet room in my company is about 1 KM away from the DCS operation room. An emergency stop switch needs to be installed in the DCS operation room, but such a distance may cause the switch to malfunction. The option of using remote cabinets in the DCS operation room is also not feasible due to limited space. Is there any remote device that can be used for an emergency stop switch? Thank you!
One option is to use an emergency stop switch with remote control functionality, or to employ industrial Ethernet/serial communication devices to transmit the emergency stop signal remotely via fiber optics or other interference-resistant transmission methods. At the same time, ensure that signal integrity and interference resistance are taken into account in the design. Additionally, a delay or confirmation mechanism can be set to reduce the risk of misoperations. When selecting equipment, it is recommended to consult professional manufacturers to ensure that safety standards and actual requirements are met. .
The emergency stop switch uses a three-contact button with a 3-out-of-2 configuration; the cable can be slightly thicker – there’s no problem with a length of 1 kilometer. Why would it malfunction?
Thank you for the guidance! Previously, we used wires with a cross-sectional area of 1 square unit and a length of nearly 1 KM; malfunctions occurred, and we haven’t tried thickening the wire diameter yet.
It is necessary to calculate and choose a wire with a larger diameter for the resistance. I have worked on projects involving 500 meters in length; after doing the calculations, I chose a thicker wire diameter, and no problems arose. Fibers and the like cannot be used; an emergency stop system must ensure safety without delaying production, so hard wiring is the most reliable option
This post was last edited by jlshnlhj on 2025-6-18 at 10:05. Since it is an emergency stop switch, it is generally used in emergency situations; therefore, the more reliable it is, the better. The fewer components involved, the more reliable it will be. There’s no need for anything like networks or devices, or for optical/electrical conversions – just use two sets (1 switch + cable (thickened)) connected in parallel (it’s best to use separate cable trays to prevent damage during installation or by excavators). Test and record before each start-up to ensure it is in good condition.
The emergency stop switch should be controllable from the nearest location, right?
A two-button system can be used; for example, in thermal power plants, the button for emergency shutdown operates on a two-of-two principle – it is only activated when both buttons are pressed simultaneously. For long-distance transmission, the wire diameter can be increased appropriately to avoid high resistance