Ken Moore

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Posts posted by Ken Moore

  4. Posted

    The 414 was the smallest version I think. We are running 417's and 410's at my current employer. But we are using them with PCS7, not your plain Step-7.

    If they were programmed in Europe, good chance it's all Statement List (think Machine language).

    If in the USA usually mostly ladder with a few function blocks. 

    We do have a LOT of S7-300's running around here, most have been migrated to TIA porta, but some are still at Step-7 classis. 

    Bob, do you have a PC with a Siemens comm card in it? OR is it a Siemens PG (Siemens laptop for programming, has Profibus port built in)?

    Based on the age, there is a good change the 443-1 comm card communicates with the program PC/laptop using ISO, not tcp/ip. ISO is a Siemens protocol that communicates over ethernet, but uses MAC addresses.  

    The last/latest version of Step-7 classic is 5.6, but 5.5 was around for a long time. 

     

    If you get on line, we can talk about Object Blocks (OB's) the difference between Functions and Function Blocks. And you will get you first exposure to Data Blocks.

    Siemens is different, but allows a lot of customization, you can do almost anything with them, but they do not have as many built in instructions as the newer CLX's do.

    Also, for standard machine control, with mostly discrete inputs/outputs and logic. The Siemens units are much faster than the PLC-5's.

     

    Edit: Almost forgot, the S7-400's have an accumulator, so anytime you read or write data to another device, the bytes are swapped.   Also all addressing is in Bytes.

     

  7. Posted

    You are on the right track. Way back when... there wasn't any setup screens. You read the manual, and typed in the configuration to various words of the Block Transfer. Later, Rockwell made the software nicer and added the software setup screens, and gave you the ability to add the ladder logic. So..if you have an older application that was written before the software enhancements, good chance the hardware  configuration was never setup.  

     

    I have never did one on the fly, but I think you should be able to do it. Just make sure you enter in the information exactly like it is listed in the Block Transfer.

  13. Posted

    The OPC server should be able to support more than one client. Does your application use the server client arrangement? I have had OPC servers sending data to an HMI and a historian on two different boxes many times. I don't know off hand how many clients the kepware can handle at once. Plus the about of data and the polling time will influence the number of clients also.

  14. Posted

    Hi Folks, I am looking for a DIN Rail mounted 24VDC fiber switch. I need two multi-mode ports and one single-mode ports all fiber connections are (ST). I was using an Elinx from B&B Electronics, model EIR203-2MT-ST, but they have been discontinued. Can anyone point me to another brand? I have a request in to N-tron, but haven't heard anything yet. thanks, Ken M.

  19. Posted

    To get a meter that will hold up in Sea Water, you are going to need an exotic alloy. Believe me I know, was in the US Navy for over 8 years. Sea water has high chloride concentrations, so Stainless last no time. You need some type of nickel alloy such as Monel ( http://en.wikipedia.org/wiki/Monel ). Naval Bronze will last a while but will get will erode over time. What is the application a sea water distillation plant?