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Vidmas30

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Posts posted by Vidmas30

  1. Good day, Having spare time, so desided to play with PLC (v350). I have a heat meter on my desk. It communicates through M-Bus protocol and there are 3 ways to choose connection type: M-Bus, RS232 and CL. I think I could connect heat meter directly to PLC (without any M-bus or CL converters) with RS232 cable. The question is how to implement data exchange between those devices? Try to implement M-Bus protocol with Visio's FB protocol? Maybe someone had such a project and can share suggestions about this. Thank you!

  2. Good day, everybody!

    I have a question about ModBus RTU: how about ModBus RTU connection - is there any way to keep it "alive"? I mean if we have master-slave connection and for example one of them (due to some reasons: power failure, system error or else) goes "offline", how this connection establishes? This happens automatically when we reset unit (bring it to normal state) or do we need to use some program function to establish connection? Thank you!

  3. Hi,

    I wrote yesterday, but for some reason it wasn't posted..

    I use no crossover cable, there's no switch (I connect PLC and SAPHIR directly). Cable length is about 2-3m. The IP settings I made according to building's, where the ventilation system belongs to. Now we connect to SAPHIR through web browser to manufacturer's webscada and it works fine. In SAPHIR's menu there's no setting like slave address. I connected through USB port using SIEMENS software SAPHIR SCOPE (for configuring ventilation controllers) but there's no such setting too. So there is possibility, that I'm using wrong ID number.

    And if we set PLC name (master) , how it is with slave's name? Maybe wrong slave's name is the reason?

  4. Hi, Damian,

    The IP settings we use according to building's network, because now we connected ventilation units to scada system using tcp port and manufacturer's webscada (through web browser). All this works fine..

    But I still tried to connect to unit with V570, without any results. Cable isn't crossover and there is no switch. Ping goes fine. There's no way (no setting in controllers menu) to set slaves address. No word about it in documentation. I connected to SAPHIR through USB port with SIEMENS software called SAPHIRSCOPE, where all settings can be configured too. But there's too no such setting (I mean slave address). So, with connection to this unit it is still open question. I'll try once again to figure it out as soon I'll be in object..

  5. Hi, Ofir,

    I read this on help file, but I just want to make sure. We have a slave PLC (v570) connected through Ethernet card to remot PC. A couple times there was such thing, that PLC was not responding - we could ping IP from PC, but we get no data. From PLC side, the SI147=6, but values SDW16 and SDW20 were not changing. SB's and SI's showed no error. Then we unplugged Ethernet cable and plugged back, and everything's gone fine again.

    So the meaning of that question was: can we use it on slave devices to establish connection with master PC?

  6. Hi, Emil and Damian,

    Now I can give you some feedback, tried today and will try tomorrow, because it was no good..

    As Emil suggested, I changed socket 2 to master and tried to connect to IP of SAPHIR - no result.. I tried initialize socket 2 to local port 502 and connect to remote port 502, then I tried to initialize socket 2 to local port 20256 then to 20257 and connect to remote port 502. None of them worked..

    As Damian questioned, here are answers;

    I can ping and connect to Vision 350, i can ping and connect through browser to SAPHIR. When I connect devices with cable, SB141 and SB142 are ON.

    SB151 - ON, SB167 - 0, SB168 - 1, SI147 - 0.

    Tried (as shown in MODBUS TCP example) to change to socket 3, but the same results...

    No idea what's wrong..

    P.S. Maybe someone could suggest what is the best tool to check Modbus TCP connection from PC?

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