Re: [foxboro] Foxboro - AB Interface Questions

Chuck,
Here we have 3 ControlLogix PLC's talking to AB30B's and we haven't faced 
the problem you describe.
Our AB30B is connected to a KF2 box and the DH+ that goes out of this box 
connects to a port of a DHRIO module in each PLC. At the PLC we assigned 
PLC5-type addresses to the data to be exchanged.
The ABSCAN block can read more than one address with no problems..... in our 
case we are reading 16 registers (PCINPS = 32 in the ABSCAN BLOCK). Of 
course, all the registers must belong to the same "data file" - you can read 
N16:0 to N16:30 with one ABSCAN block, but if you want to read N16:0 and 
N17:0 you will need 2 ABSCAN blocks.... anyway, this is not a problem, as 
you can define your PLC5-type data tables the way you like.
If you are about to change your hardware, maybe you should wait a little 
while..... Foxboro will have to offer a better communication method for 
ControlLogix at some time in the near future.... current options like DH+, 
modbus with Prosoft modules or Interchange software for Unix or RSLinx 
software for NT all seem far-fetched. I think they will have to come out 
with an Ethernet FBM that talks directly to the ControlLogix in its native 
protocol.

Pablo Lioi
System Engineer
TOTAL AUSTRAL
ARGENTINA


>From: "Jones, Charles R. (Chuck)" <Chuck.Jones@xxxxxxxxxxxxxxx>
>Reply-To: foxboro@xxxxxxxxxxxxx
>To: <foxboro@xxxxxxxxxxxxx>
>Subject: [foxboro] Foxboro - AB Interface Questions
>Date: Mon, 23 Jan 2006 17:43:01 -0500
>
>We have several Allen Bradley PLCs that we communicate with in our
>plant.  We have a mix of ControLogix and PLC5s.  We have used ABGW30s in
>the past to talk with PLC5s.  Allen Bradley people told us ControLogix
>machines could emulate PLC tables, and thus use the same gateway.  They
>left out the line that said, "a PLC5 table emulated in ControLogix may
>only have one item in it".  I have set up an APGW30 that talks to one
>ControLogix 5550 PLC.  I have a handful of points in it, each in their
>own emulated PLC5 table.  The problem is that, in the gateway, each PLC
>table requires its own ABSCAN block and there is only one ABSCAN block
>per compound.  So, each of the points is imported into the Foxboro
>system in its own compound.  I hope I have something wrong here.  But,
>this method works.  I built it based on what I understood.  Surely, no
>one else is doing it like this.
>The problem is that we are facing "end of life" issues with a lot of our
>hardware now.  We would like to replace one of our AP51s with a newer,
>bigger model at a higher operating system level that can be used as an
>AW Integrator with Interchange software.  I would like to know that I do
>not have to transfer data between control systems with only one datum
>point per table.
>
>I've read through most of 48 archived entries to the mail list, but if
>the answer is there, I still haven't found it.  Does someone know if I
>can transfer data in and out of a ControLogix PLC from Foxboro with full
>tables in a manner similar to the way the operation was done
>transferring data in and out of a PLC5?  Can I do it with an ABGW30?
>Can I do it with an AW51 Integrator?
>
>
>Chuck Jones
>Automation Technologist
>Tate & Lyle -- Lafayette South Plant
>765.477.5324 - Office  | 765.586.5290 - Cell
>
>
>
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