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Barry

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  1. Deja vous, Ausman? I'm interested because someone else is looking for info on what seems to be a seldom used module, but concerned because we were never able to get the 232 port on the 02RSC to work. Either in serial or modbus configurations. At this point you ought to get a special commendation for dealing with this hardware.
  2. That's a brilliant point. The Vision series aren't too expensive, and would allow us to really expand almost infinitely one modbus (borrowing from IP terminology for lack of better word) subnet at a time. Create a backbone that's effectively... Unistream ---> Vision ---> Vision ---> Vision ---> ad infinitum ... and split off from the Visions for our smaller I/O heavy devices. In a related point I did get a response from Unitronics about the ports on the 02RSC... "...You absolutely will have the ability to have them both be masters. The RS232 por
  3. You're right, I had an old spec sheet for the 02RSC that says 32 devices, but Unilogic doesn't seem to have a problem with me adding and compiling with triple that number (although it does enforce the 1-247 addressing limit, while the built-in master lets you assign 1-255). I'm making a stupidly-dangerous assumption that if it compiles it might allow me to operate that way... I have a feeling I'm missing a lot of details on these ports. Wish there was better documentation on them.
  4. You're absolutely correct, I missed the mark in the original post. We're likely to end up with more addresses than the built-in can handle eventually, but the critical issue is the operations limit on the modules. Ah, use one as a hub for expanding the network. That or a gateway. Good call; that's likely our best bet. ((Edit: you're actually more right than you realize. It might be time for us to find a stronger side kick than the existing little PLCs)) If we could use those serial ports we'd be able to pull it off with just existing hardware. Our last install (half this size) was
  5. We would only end up with 2 or three devices on each of the expansion module masters, so the 32 address limit isn't a big deal. Because those devices have almost 200 operations each we'd max out that limit almost immediately. Hence the need for using the serial ports as additional masters. The idea is to gain another 512 operations; not necessarily more addresses. Unfortunately the small PLCs we use aren't capable of upstream and downstream networks, otherwise they would make for a perfect bridge. But for their cost I can't complain. We might need to consider switching to ones that all
  6. Yes, Modbus spec is limited to 247 addresses but Unilogic will let you use the full binary 1-255. I've never actually connected more than 247 devices so I don't know what would happen. Those shoes you're talking about are mine, and I've never had a problem walking in them. You're only going to end up with conflicts if you screw up the addressing. So far I've managed to count into the mid 200's without hurting myself. Uniapps alone would clue you in to which devices are in conflict if there is one, let alone any basic in-program diagnostics. The built-in master is running about 20
  7. Good morning everyone! We are about to begin work on a Modbus deployment that will need far more than just the 255 addresses available on the built in CPU master. I know we can add up to three of the UAC-02RSC UniComm modules for three more masters. Unfortunately, the masters on the 02RSC have a limit of 512 operations each, so we’re going to need all three modules and then some. I’m interested in using the serial port on the top of those modules as well. Unilogic and the built-in help file shows that we can turn them into Modbus masters, but we’re not having any success getting i
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