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  1. PCS7 - FF Communication

    Hello Everyone, In PCS7 hardware configuration, I have connected IM153-2 FF link to a profibus master connected with CP443-5 Ext. And afterwards I have connected the field instrument with FF communication with the slave bus on FF link. However I am not able to delete the equipment once connected. The error is showing as the object is locked. How to unlock and delete the objects which were takes for testing purpose. Thanks in Advance, GJ
  2. Hi from new PCS7 user...

    Hey all. Just wanted to introduce myself, I'm mark and I'm employed as a process engineer in a plant in UK. I've been there 8 years now and achieved the process position through dedication and willingness to learn. Although my previous employment was as an aircraft electrical technician so I don't have the soundest PLC knowledge. Unfortunately, my more knowledgable colleagues have a tendency to enjoy keeping secrets and so I find myself thrust into this position with little guidance. So I'm going it alone! I'm trying to learn as much as I can myself. And decided this would be a place that I reach out for help as and when I need it. I've been able to monitor and use the software logic as a tool for fault finding and have implemented some modifications and new projects into the software we have on site. I've also done an intermediate course a few years ago on S7 so I am fairly capable with it. I lack knowledge on WinCC, and I am scraping my way round that when the need arises. We also don't have any test rigs available to play about on. Which I find a little frustrating. I welcome any advice people may have for me at this moment in time. I'm looking into doing some courses, a simple little course I found offers an NVQ L3 qualification for relatively little work and cost. But it's based on fundamentals of PLCs such as selecting the right PLC for a process, the limitations of PLCs, decimal to binary to hexadecimal conversions (I'm ok with that bit) and various other "fundamentals" of PLCs. I've kinda skipped this bit in training and not sure of the requirements for the course. If anyone has any advice on that, places to look, etc, then I'd appreciate it. Also any other recommended courses and reading. Cheers.... mark
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  4. Hello, I have an annoying problem with communication between Siemens S7 PLC and HMI panel. Here it how it looks like: I am using Siemens S7-315 with 343 Lean ethernet port. This port is used to communication with HMI terminal. Communication is realized through S7-TCP communication protocol. When I was testing the communication in the office everything worked fine and nothing wrong happened. The problem occururs only on the installation. After turning the PLC and HMI on everyting works fine, data is transferred correctly and variables are displyed on HMI. After a few hours the communication is suddenly lost. This is a direct connection between PLC and HMI and there are no other devices in this network. So it is not possible that suddenly there is an address confilct. I made a wireshark analysis (I connected a notebook and hub into the network) and I found out that when the communication is lost HMI terminal is trying to get data from the PLC but it is not responding. It looks like PLC ethernet port is broken. You cannot ping PLC from notebook and HMI. On the other hand you can exchange pings between HMI and notebook. The communication is back again only if you'll restart the PLC. The strangest thing is that I did not have any problem with the communication when I was testing it in the office. The configuration and project of PLC and HMI is excactly the same. The only difference is that on the installation PLC is realizing also a communication throguh Profibus and MPI. I've tried to use different ethernet cables (crossed, non-crossed) but in all cases the situation is the same. Do you know waht can be the cause of such behavoiur? Maybe someone had a similar situaion? In the attachment I send a screenshot from Wireshark which shows the moment when the communication breaks.
  5. S7 Graph step selection

    Hi all, I'm using S7 graph and I would like to be able to jump to a step after a warm restart of the PLC. This is to be able to carry on from the step the sequence was in before the restart. I have figured out that I can select a step in Manual mode. So if during the warm restart I pulse a bit for the input to SW_MAN then Load an INT value representing the S_NO before the restart into S_SEL and then pulse another bit into SW_AUTO. Will the sequencer carry on like normal in auto mode from the selected step?
  6. Comare two temp in a function bloc

    Hi, I am working in merging a pl7-3 programme to SIMATIC and i stumbled on a comparison of two tempo in a block function in the pl7-3 side. so i was wondering if it is possible in SIMATIC ? Regards.
  7. Dear all, I have implemented PID temperature control for mini heating tank system using Siemens S7-313-c2-DP PLC. Now, I want to plot the values of the "process value (temperature) " and "Setpoint" as a function of time in wincc flexible runtime. I am using wincc flexible 2008 advance SP3. However, the problem is that I have tried plotting the value of "process value" as a function of time using trendview, But the change in the value is not smooth i.e. it is in step manner. Besides, the value of temperature progresses towards the left side of the graph, but I want it in the right side. And also I would like to plot two values against time in one graph in smooth transition so that I can make the comparison and I want the plotting only on the right side of graph. So, how to do all these things? Since, I am a newbie to WinCC, I would appreciate your help. Thank you. Regards, Ankur Gajjar
  8. PLC and HMI access remotely

    Dear Experts, I have just finished commissioning my first project in S7-300 (CPU315-2 DP) and so far the palletizer is running good. and now my manager want me to access the PLC and HMI remotely if problem occur, even though I'm on my vacation. Can anybody pls. help me what hardware and software do i need to purchase to access the plc and hmi. I have searched this in google, and found e-won and simatic teleservice. Can you please give some idea. any help is really appreciated... thank you so much...
  9. Hi there, I have trouble understanding the "mechanics" of STL programming language for Siemens S7-300 PLC. For instance I have a code which looks like this (taken from the Siemens manual for extended pulse timer): With regards to the first line, AND operator checks whether the state of I 2.0 is '1'. According to the "Bit Logic Instructions" manual, it also ANDs the test result with RLO. Now the question is - what RLO is it if there are no operations beforehand? What memory area does it use for that particular RLO? Moreover, what is the Boolean bit logic string in this case? I presume it is all the lines up to the '=' sign. The confusion is also caused by instructions (FR, L, T) which are not logical operations or RLO, although there is associated memory bit with them. I'd be grateful if you could clarify this matter? Many thanks!
  10. Daily logging of flow in WinCC

    Hello, I am working on a Siemens S7-300 PLC with a WinCC HMI and I am looking to perform logging of certain values every 12 or 24 hours. Basically I have a Flow meter that constantly has flow through it. Right now I have the PLC set up to record the current value of the flow, as well as a totalizer to indicate how much flow has gone through the valve. (until an operator chooses to reset it) I need to create some sort of logic or utilize something in WinCC to calculate the flow through the valve only for that day. After that day, the value will be either deleted or replaced with a new value the next day... If anyone has any tips or advice it would be greatly appreciated. Thank you,
  11. How to read digital input signal

    Hello everyone, I am a freshman, studying about PLC. I work with S7-400 system. Please help me how to read digital input signal directly from humidity sensor using PLC. Thank you so much. Best regard!
  12. can anyone please provide me how to communicate between keithley controller 2182A(nano voltmeter) and any siemens plc.aslo the programme & instruction & parameters..ASAP using RS-232 interface?
  13. Lenze drive fault on proface

    Hi I am having a problem with an error/fault code. The fault comes from a lenze drive as an integer. We have a proface HMI monitoring a DBW in the siemens S7 300 that holds the lenze fault code. The PLC comes up with a generic code "lenze drive fault". The proface comes up with the drive code. I would like the PLC to produce a fault description using the lenze fault code in the DBW, instead of the generic one [listed above]. could anyone please help with this problem Thanks Robbo