Arun Opto 22

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About Arun Opto 22

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  • Gender Male
  • Country United States
  • Interests Professional: Automation, Instrumentation, Controls
    Personal: Music (Punk, Rockabilly, Vintage Jazz), Guitar, Golf, Basketball
  1. Why "RMS" Analog Input?

    Yes pcmcartney1, I think you are right in that it has to do with measuring AC Voltage (because an average would be "zero"), so RMS is used. The voltage for 4-20mA and 0-10V is DC.
  2. Why "RMS" Analog Input?

    b_Carlton - Thanks for the reply. Here is a link to an example, SNAP-AIVRMS Arun
  3. Some PLC analog input cards (4-20mA or 0-10V) are listed as "RMS". I know what RMS means in math. But in the context of an AI module...why would someone choose this? Or, stated another way, what benefit does it have (either for the PLC user or even for the PLC manufacturer)? Thanks in advance, Arun
  4. On Ethernet/Modbus-TCP, if a device is a Master, can it get polled by another Master? i.e. Can it act as a slave as well. Thanks, Arun
  5. Differences between RSLinx versions

    Thank You Ken!
  6. Differences between RSLinx versions

    I know this is an old discussion...and I might be able to answer my (new, related) question if I continued at RA's website for some more time (but I've spend about an hour so far): I'm having trouble understanding the architecture -- What is RSLinx versus FactoryTalk? My bottom line question is "what is their OPC Server, and will it talk to a third party OPC Client"? The client is an OPC UA client, not DA, but I'm curious for both third party DA and UA clients. Any help is appreciated.
  7. CompactLogix with 1769-OB8

    Guys - thanks. It was indeed the right end terminator. Bought one, put it on, and all systems go. Silly one - sorry.
  8. CompactLogix with 1769-OB8

    PS - I just realized that I don't have a "right end terminator" cap after the DO module. Maybe I need that?
  9. CompactLogix with 1769-OB8

    I have a CompactLogix L32E, and am simply trying to add and configure one I/O module to it: a 1769-OB8 (24VDC source DO). I've physically attached them, and have added them module to my RSLogix5000 configuration (backplane), but I get an "I/O Not Responding" blinking light when I go online and/or run mode. My fear is that I've got a controller and module of different vintages. I bought the controller in 2008, new from an AB Distributor. But, the module is from E-Bay recently. But I don't know if that is the issue....maybe I'm doing something simple wrong? I've attached screen captures of my RSLogix (V17) controller configuration, the module configuration, and the sticker on the side of the module. Any help and/or ideas are appreciated. Thanks, Arun
  10. expand AB with OPTO22

    I saw the post and refrained from replying since I work for Opto 22. But, since my name was mentioned, I thought I'd go ahead (and do indeed second Sparky's suggestion that I can be contacted for more details or a web problem). I won't speak to "good or bad", because obviously my opinion would be seen as biased. I'll speak to "why": We implemented ODVA EtherNet/IP about 2 years ago on our I/O so it could be used with Logix PLCs for the purpose of "Distributed Processing". Opto 22 SNAP I/O is "intelligent", in that you can do functions down at the I/O level like counting a DI, pulsing a DO, clamping an AO, and running a PID loop. All this can be done without any RSLogix programming. Our configuration tool is simply "drop boxes, radio buttons, fill-in-the-blanks". Taking a counter for example (the most simple) - - A normal DI module and point on that module is "intelligent", in that it can be configured as a counter, and deliver counts back to the Logix PLC. And, the PLC can, upon appropriate condition, write back to the I/O to clear the counts. So, each point has accessible "attributes", and these attributes can be configured, read, and written to. Further, this configuration can happen on the fly. For example, if you've configured a DO to be a pulse, and on condition have set it to pulse 1,000 could, in your Logix, say that if a machine or process condition dictates, change the nature of that attribute to be, say 2,000 pulses. The purpose of distributed intelligence is to both de-burden the PLC (less code, less memoryusage, better scan times), as well as offer sophisticated programmers to take advantage of these intelligent attributes in their control scheme. The "no programming", is wrt Logix PLCs and implicit messaging. We also support explicit, so you can use SNAP I/O with SLC 5/05 and MicroLogix 1100/1400 (via MSG commands). We've got lots of successful installations. I've been personally involved in about 60 or more. We promote the distributed intelligence, though I must admit a lot of people have bought based on price...."a lower cost, reliable I/O system that easily talks EIP to A-B PLCS". No need to learn a new programming language to use it. You work in what you're familiar with, RSLogix5000. (Sorry - this may indeed have sounded like a sales pitch, but that's not intentional). I invite others to continue commenting, as I'm curious as to what others think.
  11. Inexpensive Ethernet/IP I/O

    It looks like you've already gotten some great suggestions. One I'd like to add is SNAP I/O from Opto 22. Opto 22's "IO4AB" (I/O for A-B) is great for implicit messaging with ControlLogix or CompactLogix, and can also be used with SLC 5/05 or MicroLogix (using explicit messaging). Cost is reasonable, and the thing it does differently is the ability to do "distributed processing", w/out having to learn any new programming. All configurations (done in RSLogix5000 and a free EtherNet/IP config tool). Please check out this short video when you have a moment:
  12. MicroLogix Availability

    Sorry I did not see the post on March 18 with tons of replies! I thought I did a search in the search box....but I guess I could have just scrolled down.
  13. MicroLogix Availability

    Thanks Mickey & Bowhunter
  14. MicroLogix Availability

    Has anyone had trouble recently w/the availability of MicroLogix?
  15. Deleting Device from RSLinx

    Thanks All. Sorry for taking so long to check responses (have been swamped). Also, I apologize for not really understanding the relationship between RSLogix5000, RSLinx, and RSWho...and thus my question was a little vague. Ultimately, my goal is to remove from showing up in RSLogix. It looks like the post from "newpageboba" has some steps that I'll try. Glad to see that it wasn't a "dumb" Q in that the solution is nothing obvious. Will let you know how it goes.