Sajid

MrPLC Member
  • Content count

    23
  • Joined

  • Last visited

Community Reputation

0 Neutral

About Sajid

  • Rank
    Sparky

Profile Information

  • Country India
  1. Hi Friends, I am trying to select Momentum platform for a certain project I am working on. After having gone through the catalogues for Momentum I have selected Processor, I/O bases, Communication adapters(Modbus Plus). The problem is I have a lot of field devices like Power meters (Modbus)that I want to communicate with. How do I connect these in my system and what adapters do I have to select? Thanks for your replies.
  2. TwinCAT PLC & DDE

    Hi, I am using TwinCAT PLC(demo) just to familiarize myself with softPLCs.I have been searching for some kindof documentation to know more about using DDE to communicate TwinCAT variables with some other application like Excel.But could not find any. Can someone please tell me how to do this.How can I create a hot link in Excel fiel to read TwinCAT variable?Does TwinCAT support DDE in the first place? Thanks for your answers. Sajid.
  3. Hi, Can someone please give me a link form which I can download SoftLogix?Tried searching on AB site but with no success. I have tried other softPLCs link TwinCAT and CoDeSyS,now I would like to try SoftLogix. Thanks for your help. Sajid Khan.
  4. Modbus MB1 Driver for iFIX

    Hi friends, I have a set-up where I am dialing through a modem ,using MB1(Modbus) with iFIX,to poll a modbus slave.Everything seems to work fine.The driver is able to dial a particular modem at the slave end and the data is being displayed on an iFIX screen. Once after dialing the call remains open and the driver never hangs up.This is not how I would like my set-up to work.I would like to have the driver dial,say, every 30 mins or 1 hour,acquire data and then hang up the line.But this is not happening. Please help me with the setting I need to make in the driver Power Tool so that I get the desired response. Thanks.
  5. Thanks Peter for your suggestion.Well I know what you are taking about.There are people who have dedicate their entire time developing Auto Tuning software so that they can make a living out of it.And whos got a problem with them?Not me. See the kind of situation I am in right now is: I have a tough time with my customers and our commissioning engineers.No matter how nicely I would explain to them,they dont want to understand the fact that if a PID closed loop control is implemented then it requires tuning to obtain best performance.So to make things easy for them I have changed a very general PID equation slightly.And guess what the system,this is a weigh feeder,works very nice and we get the kind of response that we want. And whats the next step?Auto Tuning.No harm in trying it.
  6. Hi People, Just curious about implementing PID algorithm with Auto Tuning feature, all with ladder logic without the use of built in PID instruction for AB ML 1200 PLCs. I have managed to implement a custom PID equation in my program, with the sole purpose of making things easy for service engineers and customers with tuning the loop.Still working on it. But then I stumbled upon "Auto Tuning" that i read about in a book. Just wanted to ask if anyone has tried this before or can you give me some ideas as to where I can find information about Auto Tuning theory/flow charts with respect to digital controllers, and then I could put it in my ladder logic. Thanks for your help/suggestions. Sajid
  7. Wonderware InControl

    Thanks for your replys, Well I seem to be getting more and more information on Soft PLCs. There are lots of people who know about them but havent ever met one who had used it. It might take some time to soft PLCs to compete with the hardware based PLCs.But right now I dont think using a soft PLC is actually that good an idea. Thanks again.
  8. Thanks Ken, I have tried looking in to the S2 file.But actually I want to be able to set some bit in the S2 file through PanelView which would cause the memory module program to be loaded.I dont seem to find anything like that.Or maybe this sort of a feature in not available. Thanks for your suggestion once again.
  9. Hi People, I am working on a project using ML1200 and PanelView 300 Micro.Things like weight tare and Calibration are programmed in the ladder logic. I also have a MM1 memory module installed with the PLC. The thing I fear the most with this PLC is the PLC going into a fault mode and loosing all retentive data which is very critical for the proper operation of the system (weigh feeder). Its is usually very difficult to redo the taring and calibration procedure and sometimes impossible. I was just thinking if in case any fault occurs and I loose the data then I could be able to load the default program in to the PLC memory. But I dont see any means to be able to trigger the loading of default program from memory module as and when I want from the Panel View. Can anyone let me know if there is anything I could do with this? Has any one tried anything like this before?. Thanks for your help.
  10. SIMATIC Manager S7 Simulation

    Thanks JesperMP for the information.I am not very familiar with other simulation softwares but I will surely have a look at the ones you suggested.Its always very handy to have a simulation software in the non-availability of a PLC.And thats always the situation here.The program is to be developed and tested before actually working with the PLC.
  11. Wonderware InControl

    Hi, I worked with InTouch Factory Suite package some time back and I am curious to know more about another element of the suite InControl. It looks like a software for developing control.Please share your knowledge on this.Is it a soft PLC or is it just to develop logic for the InTouch HMI???? Thanks.
  12. SIMATIC Manager S7 Simulation

    Hi people, I have a question to ask. I have recently been working with the SIMATIC Manager for S7 300 and 400 PLCs.It has a a built in simulation tool.I have written a few programs and tested them with the Simulation thing. I was wondering if there is any way to communicate with a SCADA program like InTouch running on the same machine using DDE.I tried to looking in the help files but could not find any detailed explanation on DDE. Has anyone tried such a thing before??Thanks for your inputs. Sajid Khan.
  13. Hi Friends, I have a question to ask.Why am I not able to use a CTU when there is already a HSC present in my program??? I cannot understand why I shouldn't be able to do such a thing as the HSC is configured to count pulses coming in from input channel I:0/0.So it depends on input signals that are external to the PLC.Where as a CTU present in the same program may be internal to the PLC and may be just counting certain events happening on the software level. Any suggestions/views????
  14. The rounding part is OK. But a TRUNCATE function would have been very useful.This would have given the programmer more options!!!.And why would AB not include that in RSLogix500?Since many other PLCs have truncate instruction in their programming software.
  15. Thanks Micky and all others for your suggestions. Well, all I wanted was the un-truncated integer part.So I guess a subtracting 0.5 from the float value will do just fine. Mmmmmmm.................now I think there's more to floating point numbers than what I had previously thought. Thanks once again.