bartolim

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About bartolim

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  1. I agree with Mikey... depending on the device and PLC I/O card configuration, you may or may not get a workable solution by just making a series connection. In addition, one loose connection and you lose both PLC inputs. A better solution is to use a signal conditioner as he describes to split one current loop into two; one that we use a lot is the Phoenix Contact MCR Signal Multiplier: https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=2814854&library=usen&pcck=P-13-15-03-01&tab=1
  2. I/O mapping?

    You can look at it both ways as stated here. Personally, I use I/O mapping... as stated, if you have an input point go bad, you can just assign the mapped point to the new input point at one place and off you go. Works the same for outputs. An additional benefit that I find is that my equipment will not aloow you to force an input. With the input point mapped to an internal point, you can force that point to test logic. Just my $0.02
  3. There is a package out there called U.C. ME. It is OPC-based, and can interface with HMI packages and PLC hardware, and send SMS text messages or emails to cell phones, or alphanumeric messages to pagers. If you have a connection to a mail server, it will be able to send emails for alarms. It will also allow you to take remote control from your cell phone. To work the SMS messages, you will need a cellular modem. It is easy to configure, and very robust, but we had to abandon the cell phone functionality pursuit due to RF restrictions at our location and security concerns about the two-way accessibility. Otherwise, it looks great. you can find more information here: www.controlsee.com Hope this helps...
  4. PID Temperature Regulation

    I agree with Jeremy; the object control loop is the master or outer loop, and the air control loop is the slave or inner loop. The output CV from the outer loop becomes the setpoint for the inner loop; this can be mathematically scaled to provide a setpoint for the inner loop with a maximum of 540 degrees. You may want to reduce your inner loop deadband a little (or a lot), depending on how the heater controller works (analog, staged, etc.) In any case, the inner loop should be able to hold a relatively tight control band and respond quickly to setpoint changes driven by the object process control loop. Process movement within the deadband will not produce any change in controller output, so it will take some tuning to find the best response. The inner loop gets tuned first (place the outer loop in manual to eliminate interaction). There are a number of good reference sources covering cascade control; one that comes to mind is Tuning and Control Loop Performance, by Greg McMillan, available through ISA. Hope this helps,
  5. We have had very good sucess with units from Vaisala. Here is a link to the type of instrument that you are looking for. http://www.vaisala.com/en/buildingautomation/products/humidityandtemperature/outdoorhumiditytransmitters/Pages/HMDW6070.aspx
  6. New Engineer Seeking Advice for PLC

    ISA (International Society of Automation) provides several courses aimed at different experience levels. Their introductory course offering is "PLC Automation: PLC Structure, Programming, Installation and Maintenance (TC30P)". This is one of several courses taught by Conrad DeGrace, who, IMHO, is an eccellent instructor; I have taken his advanced level course offerings. Here is a link to this ISA offering: http://www.isa.org/Template.cfm?Section=Find_Training&template=/conference/ShortDescription.cfm&ConferenceID=5020 The ISA courses are available to both members and non-members, and are highly recommended. Hope this helps,
  7. PLC Programming and Smartphone Apps

    There is actually an application out there that, while it does not run exclusively on a smartphone, allows a smartphone to communicate and view PLC functions through an OPC connection. It's not a PLC programmer, so not sure if this would be what you are looking for, but Here is a link... www.controlsee.com
  8. I can strongly recommend the ISA offering Tuning Control Loops (TC05). Here is a link to their website for information. http://www.isa.org/Template.cfm?Section=Find_Training&template=/contentmanagement/contentdisplay.cfm&contentID=88584
  9. ELECTRICAL PRINTS ?

    AutoCAD Electrical ROCKS for creating wiring drawings. As Ken said, it does cost an arm and a leg and several other parts, but for productivity it can't be beat. I started using it when it was still Via Schematic, offered by Via Development as an add-on to AutoCAD. Autodesk thought so much of the package that they acquired the company and rolled out AutoCAD Electrical. And AutoCAD LT is a good lower-priced package that maintains AutoCAD compatibility. There is also the JIC add-on symbol package offered on this forum, which has some handy stuff... http://forums.mrplc.com/index.php?app=downloads&showfile=146
  10. DATA LOGGING IN EXCEL

    Many of the HMI packages available today have an Excel datalog export capability.
  11. We have been using Matrikon OPC server for Modbus to connect to device points with Cimplicity PE 8.0 SIM 7. Looking at my license, it is for ProServer, which has Modbus TCP protocol included. I am trying to set up a connection to the Modbus devices, but the device setup does not give me any generic options, just a couple of GE Versamax and Versapoint ENIUs, four different Modicon devices, and a Quantum, whatever that is. None of them give me a connection. What I am trying to do is to eliminate the OPC connections to the four Modbus TCP devices through Matrikon, and bring them directly into Cimplicity, to eliminate the added layer of software. Matrikon is performing well, but we have had ocasional issues with it, and simplification of the data aquisition seems like a good idea. I have seen other references to setting up Modbus devices as Generic, but I cannot seem to find out how. Any idea as to what I am missing? The I/P address is there, but not sure where to go from here. Thanks in advance
  12. how move licence

    Of course, if the hard disk is infected with a virus, and you move anything from it to a USB stick, you should scan the stick before doing anything with it in another machine. McAfee Stinger is good for this; it can be downloaded from their website and burned to a bootable CD.
  13. Can i used Servo Motor with Variable Freq. Drive?

    No, a VFD will control the speed of a standard (typ) 3 phase motor. To control a Servo motor, you will need to use a suitable Servo Drive.
  14. Modbus TCP data into Series 9070?

    Russ, To look at this another way; can I use the same technique to bring ModBus serial data into the RS232 or RS485 serial port on a 90-30 CPU352? I just got some new equipment connected to this one and it would be really handy to bring the data in. Thanks in advance...
  15. stinky stuff

    If any GE bashers out there want further proof that they are not alone in misery, see this post: http://forums.mrplc.com/index.php?showtopic=21711