dswaine

Apologies if I'm missing something but ... If you're using frontpanel Datasocket connections: have you tried just linking a boolean/switch to a particular bit? If you're using the Datasocket VIs: have you tried DataSocket Write Boolean.vi or DataSocket Read Boolean.vi (from ... \LabVIEW xx\vi.lib\platform\dataskt.llb).

Mize, You've got a lot of options and aren't necessarily limited to using OPC. A lot may depend on how many euros you have to spend. A web search (example here) will bring up dozens of OPC servers for Siemens S7 and there are quite a few that make use of the "HMI Adapter" cable

You may want to take a look at the "S7-200 Programmable Controller System Manual"'s (6ES7298-8FA24-8BH0) chapter on using Modbus communication. If you can't find the manual on Siemens' site, there's a 2004 copy at mrplc.com. As described in it, Siemens has an the add-on ($$) library that includes code for enabling Modbus on S7-200 CPUs. I've never used it, but if my impression is correct it will allow you to use the S7-200's serial port a Modbus slave. If true that would enable the use of one of the more readily available Modbus drivers that have been written in LabVIEW. Good luck with whatever route you take.

Conversion to v6.0 attached. Download File:post-55-1132059125.vi

Right clicking on the frame of While/For loops, Case/Sequence structures you can access the "Remove ..." command which I think (?) is what you're looking for. You can also Replace one loop with the other type; ditto for the structures.

There's history involved too. LabVIEW for Windows only came out in ~1992; before that it was LabVIEW for Macs (since '86) and LabWindows for DOS (since '87). There's a couple of articles in NI's old 'Instrumentation Newsletter' from the winter of 92/93 on making the choice between LabVIEW and LabWindows, and they boil down to the point(s) made by m3nth: preferred programming methodology.

If my memory is correct, this was a relatively common problem in LV v6.0 which was fixed ... to a large degree ... in v6.0.1 or 6.0.2. The patch for v6.0.2 was/is free and is available here. There were glitches in LV6.02 as well, but they were definitely fewer.

There are several ways, but the one that came to my mind first was: If you�re on Windows, over in the Example Code section at ni.com, there�s clipboard.llb. With it you can do something like in the attached jpg. If you search the Example Code section for �clipboard�, you�ll get several other hits for Vis (some ancient) that take the keystroke simulation approach.

Besides the links that ptit bras gave you, an excellent summary of available LabVIEW/Modbus options was put together by Khalid on the NI forum last year and can be found here. Most, if not all, will work in LV6.1.

Things may have moved a bit in v7, but try YScale.Range. ... to access Increment, Minor Increment and Start. "Start" is the value of the first major gridline which (I think) defaults to a multiple of Increment.

Michael, Apologies if I'm missing something, but does your question boil down to: "How can I easily get discrete bit/boolean values from a U8?" If yes, then the answer is: "Numeric>Conversion>Number to Boolean Array"

@ 0:10 EST 20040204: Group: The Clash Album: London Calling

To get rid of the line, set Plot interpolation = 0.

Hi Jose, I'm assuming that this is a string input you're dealing with. If so the 'Scan from String' and 'Date/Time To Seconds' functions can be used to obtain a numeric datetime. Attached vi (LV6.1) is variation of what I use. Convert the strings for the two times and then subtract. Download File:post-55-1101928881.vi

I think "Front Panel Window >> State" was added in LV7 (or else I've been making life harder than need be). In LV6.1, you can use the Windows management VIs that can be found in the lvwutil32 libraries available from: NI KnowledgeBase Minimize Window.vi and Maximize Window.vi in winutil.llb.