×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Cimplicity OPC Speed Problem

Cimplicity OPC Speed Problem

Cimplicity OPC Speed Problem

(OP)
We have Cimplicity Plant edition interfaced to Seimens S7-300 PLC through the siemens PCMCIA LINK and an OPC server called Merz.

THIS IS BLOODY SLOW.

If we take one tag only in Cimplicity (or Merz) we can get it to refresh 5 times a second. If we take 5 points the refresh drops to about just over a second. By the time we take our 136 points refresh of all the points is upto 7Sec. Making all the graphics very jumpy.

My opinion of Scada was that it should cope with hundreds of points, if not thousands, at reasonable refresh rates. 136 tags is not that many points.


Points I can tell you :

1) Data inside PLC is in multiple not contionous blocks
2) Not all points are required all the time 36 (about 4 times a second) are need all the time 100 are configuration needed only when they have to be changed.
3) We have tried running the pcmcia link at 6Mbs on profibus and at 187.5kbs on MPI with little or no difference. But, both are slightly quicker than the Serial Link!
4) Laptop runing cimplicity ins pentium II with 128MB RAM running Win 2K Sp2. With 2G Free on HDD.
5) PLC is running high speed maths on a 25mS timer using 15ms of Time.
6) PLC is Siemens S7-315 with out DP interface. I have access to a S7-315Dp for testing only.
7) I have been speaking to Siemens, Cimplicity(GE-Fanuc) and Merz about this problem but at this point They havn't resolved it.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources