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!

*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.

Jobs

DCS/PLC CPU models

DCS/PLC CPU models

(OP)
I don't suppose anybody could tell me what model of processors are used in common industrial PLC/DCS controllers? I assume the majority are Intel based possibly Xeon for higher end controllers. I heard some old Siemens S7 CPU's use Mitsubishi chips.

I'm more concerned about DCS controllers since they handle a lot more network data. I just want to do a small study on industrial controller performance.

Thanks
Dan

RE: DCS/PLC CPU models

I think what your asking is controller connection limit. Thats all in detailed user manual PDFs provided by the manufacturer of the dcs/plc or pac controller.



RE: DCS/PLC CPU models

(OP)
I'm not asking for facts and figures and yes I have the controller spec sheets I'm talking about microprocessor models.

Thanks
Dan

RE: DCS/PLC CPU models

(OP)
I don't expect they use typical LGA socket type processors found in personal computers no but I know for certain they don't produce their own chips except maybe Honeywell but still I doubt. I suspect at least some of the processors are of the Pentium/Xeon x86/64 family. Smaller PLC CPU's possibly not, I would guess at Texas Instruments/Motorola RISC type models.

RE: DCS/PLC CPU models

I have been told that the SLC 5 series uses an Intel 186 processor to handle communications, math and timer operations. Boolean logic is solved with a custom chip.

RE: DCS/PLC CPU models

The biggest issue you have with the type of processor is the endian format of the data.

Allen Bradley = intel = little endian format
Siemens = motorala? = big endian format

Not sure what the other manufacturers use?

http://en.wikipedia.org/wiki/Endianness

If your integrating the two processor above you need to be aware of it.

RE: DCS/PLC CPU models

I have been told the same as 'djs' about the SLC 5 series.
But I have never heard that Siemens use a Motorola processor.

Kind regards

RE: DCS/PLC CPU models

Honeywell's HC900 (a modular I/O rack PAC, process automation controller, not a PLC) CPU module uses the e300 32 Bit RISC based PowerPC Architecture, according to its spec sheet.

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close