Remote IO layout
Thread Content
For the fine chemical production line, our management recently asked us to design on-site IO cabinets in order to reduce costs (for cables, cable trays, etc.). I’m curious to know if anyone has done or seen something like this before – is it convenient to use in practice, and are there any issues identified by experts?
Remote IO stations are a very common configuration; for the relevant standards, refer to HG_T20508-2014
It refers to the situation where cabinets are placed in the production workshop
What is present on-site cannot be called a cabinet; the largest size for a wiring box should not exceed 1 meter, otherwise it cannot be referred to as an on-site IO
Yes, we plan to make an explosion-proof box sized 600×800, which will contain terminal blocks and clips, etc. The problem this creates is that there will be many explosion-proof boxes in the workshop; therefore, I’m wondering if there are any other cases like this
Some DCS manufacturers offer Smart systems, with all the components located inside explosion-proof enclosures on site; however, a single cabinet can accommodate only a limited number of sensors.
It’s almost always like this; especially in refined manufacturing plants, it’s the same everywhere. It seems that Turck’s solution is a bit more focused at the moment, but it’s expensive; it can communicate with many systems. The Smatr system from the central control unit and the OCS from Lenze are quite similar in function
This is a somewhat complicated issue; as safety requirements become stricter, having DCS control boxes on site might eventually pose a safety hazard, and even entire PLC cabinets are at risk. Although all of these devices meet the explosion-proof requirements, some people still consider them unsafe.
Yes, we considered adopting this approach in a project a few years ago, but it was rejected. While this method saves on initial construction costs, the subsequent operation and maintenance costs might offset those savings, and there may also be a need for modifications later on, which again represents a significant expense