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| 5/14/2014 2:45 PM | |
Joined: 11/21/2007 Last visit: 12/23/2024 Posts: 2325 Rating:
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Hello sunny1232 Let me summarise the topic here for you : 1. Remote I/Os are typically used in medium and large systems, spread over multiple cabinets / locations. 2. They are located close to the devices to which they have to connect. e.g. you can have a RIO cabinet in each section of the plant and all I/Os of that area will be wired to the closest cabinet. This will enable minimum cable lengths to be used and result in corresponding savings 3. Electrical cabinets like MCCs, Control Desks etc can have RIOs installed within them so that all devices come factory wired to RIOs, eliminatinganycabling at site. Only the Communication cable and power cable will be needed for the RIO.Also there is no need of I/O checking at site if these have already been checked at factory.There are no Cable Schedulesand cable checkings required. 4. Being close to the devices that they control, commissioning and troubleshooting is much easier, as a programmer can be plugged in locally for commissioning of each RIO panel. 5. Different people and engineerdifferent parts of the plante.g. MCC Engineer, Control Desk Engineer and Field Devices engineer require minimal co-ordination with each other. They can almost independentlyengineer their sections as there are hardly any interconnecting cables. Hope this helps Cheers Navnag |
Last edited by: Navnag at: 5/14/2014 2:46 PMThere is no such thing as the last bug in a program |
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| 7/25/2014 1:21 PM | |
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Joined: 11/21/2007 Last visit: 12/23/2024 Posts: 2325 Rating:
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Hello sunny1232 Let me try try to answer your queries one by one :
Yes & No. While ease of maintainence is definitely a factor, the more important factor is the we can avoid the cost of the cablesand Cable Trays( and corresponding installation cost ) . In our experience, the extra cost of Interface modules,RIO Cabinet etc is more than offset by the cost of cables and associated cost savings for more that 100 I/Os at a distance of > 100 meters.
if your I/Os are at a distamce of 200 meters from your control room, it definitely makes sense to use RIOs near the source of your I/Os ( Assuming you have > 100 I/Os ). It not only results in easier I/O checking and troubleshooting, would also save you money in the form of less cable and associated costs, not to speak of faster installation and commissioning. Hope this helps Cheers Navnag |
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