Fieldbus adapter

T

Thread Starter

Toman

Hello

I do have to replace a AC450 ABB PLC by a Siemens S7 PLC. The existing ABB drives (DCS600,ACS800) are remaining. The AF100 Fieldbus source will be replaced by Profibus DP Field-Bus source. The existing control of the drives is via AC80's and via CI810B's.

What adapter can i use to get this Profibus/AF100 link.

Thanks for Your help.
 
S
For the ACS-800, you need an RPBA-01 adapter (RPBA-01-KIT if ordered separately). Not sure about the DCS-600, but this card also works with the DCS-800, so maybe it's the right one for your 600 as well.
 
Errm, Maybe this is not so easy. The key here is the OP mentions that the drives are controlled by AC80's

<b>Is this a Sectional Drive ?????</b>

In this case your communications between the AC450 and the AC80 is across AF100 and changing out to Profibus is NOT supported. All of the drive coordination logic is contained in the AC80 while the AC450 is a critical part of the Sectional Drive system HMI. The AC80's communicate to each drive via Drive Bus.

Do you intend to replace the AC80s ?
If yes, then you can indeed change the comms modules on each drive. But you will not be able to communicate to the AC80 controllers.

Rob
www[.]lymac.co.nz
 
Hi Rob

What is sectional drive.

There are once one drive and once two drives connected via a AC80.
I don't know if the AC80 is used only as the Interface (AF100--Drive Bus adapter) or if other signals get read from the AC80. Best are solutions for both way's.
 
A sectional drive is ABB's term for several co-ordinated drives operating in Sections (its pretty common in the Paper Industry for example). Each section of drives can have different speed references, but all drives work together in a co-ordinated way.

The AC80's provide the co-ordination between each drive section. The AC450 sends a Master Speed Reference to the AC80. The AC80 coordinates the speed references, drive states, status and fault data etc for each Drive, or section of drives. The AC450 then formats the status data from the AC80 ready for display on the HMI.

I do not know about your site or application so I can't give you a detailed answer. But I think it is possible that you won't be able to just replace the AC450 without knowing more about whats in the AC80 and potentially replacing that too. Which is probably a much bigger job than you were expecting.

Rob
 
Hi Rob,

yes you are right, that's a difficult big job.

About the AC80 i found out there is a DDCS communication via NDBU-95 with the drives (this link can be changed into a Profibus DP via a NPBA-12 module) and a Bus to S00 I/O via CI810. Now my question: can i replace the CI810 by a CI801?

The Adapter NAFA-01 consists of a CI810 and TB810's. here is the same question: can i replace the CI810 by a CI801?

Thanks
Toman
 
No

The CI810 carries a TB810 optical modem, which is where the comms to the drive really happens. The CI801 doesn't support this.

What is your end goal - Why do you need to remove the AC450? My company has got some good experience with converting Siemens Sectional drives to ABB, but not the other way around. Its a pretty specialised job.

Rob
 
Hi

The TB810 is the optical link to the drives, the CI810 is the adapter from fieldbus AF100 to Module Bus (DDCS). After reading in all the manuals (ABB never recommend and never denies the replacement of CI810 by CI801"), i thought the CI801 is "just" a adapter from Profibus to Module Bus (DDCS)which can be plugged on to the existing TB810.

Toman
 
DDCS is not Modulebus. The CI801 cannot talk on DDCS.

The issue here is not whether you can get the S7 to talk to the Drives - clearly you CAN do this.

The problem you have is that you cannot talk to the AC80 using profibus. And since the AC80 may contain critical code for running and coordinating the drives you need to know exactly what the AC80 is used for and whether you can replace this or not.

I cant tell you any more than that without knowing about your specific application.
 
Hi

Sorry, i meant DDCS Drive Bus.

I thought the code the AC80 is using for communication with the drives is the same as the FCI is using when communicating with the drives.

The application i have is:

1. AC450 using AF100 to FCI (CI810B/TB810) using DDCS for comm.with drives (DCS600, ACS600 and ACS800).

2. AC450 using AF100 to AC80 using electrical module bus for comm. with S800 I/O and Drive Bus via NDBU-95 for comm. with drives (DCS600).

I would have kicked out the AC80 and replace the I/O functions with ET200 and communicate with the drives CI801/TB842 or direct Profibus NPBA-12.

For the FCI (now CI810B/TB810) i like to use new CI801 plugged on to the existing TB810.

But, the next Problem: from where do i get CI801.
 
> I thought the code the AC80 is using for communication with the drives
> is the same as the FCI is using when communicating with the drives.

Maybe I was not so clear. The AC80 is not an I/O module. It is a PLC - and quite a powerful one. It probably contains site specific application software. In many applications, the real Drives control is done in the AC80 and the AC450 is only used for HMI.

Rob
 
Ups!!

This could mean that the AC80 is the source and manager of the Ref.Values to the (on the AF100 bus) parallel installed FCI's.
This job i could shift in to the S7.

But i still need the CI801 or it's replacement, don't i?
 
Steve Myers already posted on how to connect the drives direct to the S7 using profibus.

The problem you have is communicating between the S7 and the AC80 PLC. The AC80 PLC is expecting to communicate with an AC450 across an AF100 interface. There is no AF100 <-> profibus convertor because the messaging structure and protocol is completely different. So you will need to either replace the AC80 or reprogram it to use an Profibus Interface Module (which I believe may be an NPBA-82). I have no idea how difficult this could be or even if it is really possible because the AC80 software is heavily reliant on AF100 comms to the AC450.

As I've already said several times before, I cant give you any more details because I don't know about your site and why you even have an AC80.
 
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