Hi, as a PLC programmer with no (yet) experience of VB, I could do with some guidance. I have an app to develop that will take an ASCII text string (from a PLC) from the serial COM port and save it as a file, the file name being sequentially numbered (0000-9999) with a .prd extension. Once at...
They just follow on from the existing IO. I think from (fading) memory, you can re-address them in MicroWin. You can always get your code to turn on an output and see if the LED comes on, you can then be sure the CPU is working with the block
Hi,
It's been a couple of years since an aborted WinCC project - but I do remember having a couple of CD's - Config and Comms manual and one other - that had a seemingly ever expanding help tree. I'll dig out the 6ES7 part numbers if I can locate them at work tomorrow
I have just read that the licence manager for v5.3 differs greatly from the old AUTHORSW disk method of authorisation.
The Siemens blurb says that you can now have s7 installed on as many PC's as you like and you only pay for the number of licences required for simultaneous users. Surely this...
I have done several punch (blanking, continuous feed) presses in the UK - using only one PLC, but as a must a double circuit safety relay. Had several inspections from regulatory bodies, never any questions - mos tof these presses were converted from relay logic, there was much more danger there...
Thanks Mike, excellent work !!
I'll have a copy of the manual if you can e-mail it then ;
either
dumbwitness@aol.com
or
d.mcsweeney@mcbride.co.uk
thanks again !
The S7-200 uses a PPI interface, the cable you have is for these units only. The S7-300 uses a MPI interface.
Both are RS485 based, but the protocols are different.
There are 3rd party interfaces available that will do both. I have not tested, but have heard reccommendations for the interface...
Thanks Rob,
It's been a while since I used S7-200's, my software version is V2.1. Have now checked with Siemens and spotted the upgrade to V3 and the optional pack you mentioned. Thanks again,
Darren
Hi all,
Struglling to find documentation or examples for comms between a Simatic S7-200 and sone drives using USS protocol.
Anybody point me in the right direction ?
Stop the panic - problem solved !!!
It's a S5-100 CPU 103, I've just read you can have 128 timers T 0 - T 127,
I called mine T 200 to keep it sepaerate from the others when looking through the code !
This timer appears to work once, then stay on !
Renamed it T 127 and it functions perfect ...
Urgent problem with an SF off-delay timer in Step 5.
I've got an output that starts an SF timer ,
The timer is set to run on 1 second after the output stops-
this happens OK, but the output is remaining on after the time has elapsed - this is different to the explanation in the S5 help files !!!
Anybody know a good resource for WinCC self-teaching ?
I have the config and comms manual on CD-ROM, but it's bloody awful to read.
Any good 3rd party books ?
I would always recommend using the WinCC computer set to PG mode as described in the post above.
I have had less comms problems since adopting this approach ( it was actually recommended by a Siemens tech).
I have also had tags showing as "no connection to PLC" when moused over, with...
