saultgeorge
Lifetime Supporting Member
Hi
I'm not busy enough here at my work, so I have time to write programs to keep myself up to speed. So I wrote a rather complex (I think, anyway) traffic light program from scratch in RS 5000 v.20.04. It has crosswalks, vehicle counts, left turn lanes, SCADA, faults and some other stuff. Now before all of you folks start hammering on me about no longer using PLC's in traffic control, I was wondering how back in the day or even now that timing presets, event programming sequencing, and receiving and clearing faults could be accomplished from a central SCADA headquarters. Would there have been a phone line? Co-ax cable? Ethernet? Radio? We had radio to our sites when I worked at a water utility, but it went into an RTU unit.
Lastly, if one wanted to send say a value of 20000 from SCADA to a specific controller, how would that value get written into a tag that would be moved into the preset of a timer in logic for example? Would there be an interface module from SCADA in the PLC rack? I think one could convert it then. I know all you folks are busier than I am, but unless I get more breakdowns, I have to keep busy. Thanks for any replies.
I'm not busy enough here at my work, so I have time to write programs to keep myself up to speed. So I wrote a rather complex (I think, anyway) traffic light program from scratch in RS 5000 v.20.04. It has crosswalks, vehicle counts, left turn lanes, SCADA, faults and some other stuff. Now before all of you folks start hammering on me about no longer using PLC's in traffic control, I was wondering how back in the day or even now that timing presets, event programming sequencing, and receiving and clearing faults could be accomplished from a central SCADA headquarters. Would there have been a phone line? Co-ax cable? Ethernet? Radio? We had radio to our sites when I worked at a water utility, but it went into an RTU unit.
Lastly, if one wanted to send say a value of 20000 from SCADA to a specific controller, how would that value get written into a tag that would be moved into the preset of a timer in logic for example? Would there be an interface module from SCADA in the PLC rack? I think one could convert it then. I know all you folks are busier than I am, but unless I get more breakdowns, I have to keep busy. Thanks for any replies.