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Simon

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Simon last won the day on December 13 2016

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About Simon

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    http://www.colterlec.com.au

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    Unitronics Distributor

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  1. The status information is accessed using a ladder function in the V700. From the help file: I found this topic by searching "v700 ethernet" in the help.
  2. Hi JJ, I have a few questions: * When you say it is connected to Port 2 of the V570 - do you mean COM2? Does the thermocouple have a Serial/Modbus interface? * The post by Flex727 is correct, the E2B snap-in module doesn't take thermocouple inputs directly. It would need a signal transmitter, typically this converts the thermocouple interface to 4...20mA current signal. If you have a datasheet for the thermocouple and/or any photos of the device and the way youhave it wired up, please post.
  3. Just managed to help a customer get the UniStream talking to an SMC EX600 module via Ethernet/IP. The original post above was helpful, so thank you @Pista :-)
  4. I've just encountered the Run Idle as well. Looks like it is an optional 32-bit header from some google searches I have done. I did find some additional details in the UniStream help file by searching for "idle":
  5. U90 Ladder shows the +/- 10V notation, so I would say that is definitive. For the record, the IO-AI2-AO4 expansion module also has +/- 10V outputs (Jazz does not support expansion modules).
  6. Simon

    Linearizing Analog Input

    With UniStream you don't need to use the linearisation block, the analogue input configuration does it for you. See details below, this will scale the 4...20mA input to 0...10,000 as an integer value. There is no need to understand the min/max range of the digital input (or output) word (of course you still need to know if the hardware resolution is high enough to measure the value accurately). Set up the analogue input hardware config as follows: The only downside to this is that the scaling is a literal constant - you can't vary it during run-time. You can still use the X1, X2, Y1, Y2 method and linearisation block if you need the flexibility as it will allow you to use variable tags as your linearisation points. You might do this if you wanted to do field calibration in the PLC. BTW, when you first open the properties box above, the "To" field shows the range based on the native resolution of the analogue input (for example 14-bit = 16383).
  7. As above, the resolution will not prevent you from getting a reading. You mention 2-wire transducers. Firstly just work with the Oxygen transducer, as I assume it is a 3 or 4 wire device? I would expect the Jazz to read it fine. If you are including the 2-wire devices in the IO wiring they may be interfering with the readings. Also when you say you "couldn't get the measurement" what does that mean exactly? Was the value 0, 1024, 32767? Did it vary at all when the oxygen level varied, even if it was the incorrect value? With the 2-wire devices, the Unitronics PLCs do not provide loop power for 2-wire analogue transmitters. You will need a power supply for loop power and the best way to do this is to use an isolation module with loop power capability.
  8. Are you doing anything special with screen jumps, for example using ladder functions to jump between HMI screens? It sounds like the unit is flipping between HMI screens.
  9. Simon

    Safety contact on outputs

    I would make a couple of comments: This is not good practice for safety engineering. The way you have it, the PLC is in between the safety contacts and the downstream equipment. For example, if the PLC failed (for any reason) and put 24V on the outputs (say from an internal short circuit), the safety contact would have no effect. A better circuit would place the safety contacts *after* the PLC outputs, and yes you would then need 3 contacts. I say this is a "better" circuit, but it still may not be the correct circuit for your application. You would need to check your local safety regulations and follow all requirements of those regulations. With the problem you are experiencing with comms loss, I suggest it would be an EMC disturbance resulting from the sudden loss of power to the PLC output circuit and/or the drive it is controlling.
  10. FWIW, a "proper" RJ45 to DB25 convertor isn't a "get out of jail free" card. It might help hold things together but you still need to know where the pins are going. As Ausman said, testing is key and the basics are RX, TX and Ground, and turn off hardware handshaking. If you can't turn off hardware handshaking then a loopback is needed on the handshake lines.
  11. Simon

    Windows 10 Pro

    The Jazz contains a built-in USB to Serial convertor.
  12. Without having looked at the details, I would go with serial interface (RS232 or RS485). Usually they just accept a simple ASCII string and display the numbers.
  13. Simon

    ASCII Communication

    Just to make it 100% clear, the Jazz and M90/91 series don't support 115k baud. You would need a model from the enhanced vision series (for example the Vision 700), or the Unistream
  14. I agree with all of the above - sounds like "dirty" power. Another place I have seen this type of behaviour is on vehicles, where the PLC is directly connected to the main electrical system. When starting the engine the voltage dips way down, and vehicles have a lot of spikes from the operation of the battery charge regular and large auxiliary loads. Since you already have a switch mode power supply, which will be filtering out some of the transients and fluctuations, the next step in that direction would be a small UPS, either on the main side or the 24VDC side.
  15. Simon

    EX-RC1 keeps dying

    I would stick with the separate power supplies as you have them. The CAN comms power supply is isolated internally, so using a separate power supply maintains this isolation. Just to check, is the 0V of the CAN power supply connected to ground or 0V of the PLC supply? I believe it should be floating, that is not connected to the main system 0V or GND. I think this then puts the focus on what is happening at the EX-RC1. Check the datasheets, as I know that for some modules Unitronics ask that the 0V rails of the different power supplies are connected together. Hope this helps.
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