communication Allen Bradley via ethernet

Hi guys,
I need to develop a driver in order to communicate with plcs Allen Bradley via Ethernet.
The only thing I know is the DF1 protocol. It is used to communicate on serial.
So I ask: there is a "DF1-version" also for Ethernet?
Is that a "right" question? I mean: is possible to find a serial protocol also on ethernet? (someone told me yes...but I think it's strange).
Anyway: do you know any protocols for AB and via ethernet?
And do you know where I can find some documents (maybe via internet)?
Thank you very much to everyone,
bye.
Alex

Digi Box

Look for Digi Box. it's a passtrought DF1 to ethernet. I used it with
PLC5, slc500.

Digi Box

Thank you for your fast reply.
I've tried to search digi box in internet but with no result.
Also on the site of AB the search has given no result.
Could tell me where I can found some documents in order to understand the protocol?
Thank you very much.
Bye

Try this

Google on "Ron Gage" and "ABEL" (Allen Bradley Ethernet Library).

What are your reasons for not using RSLinx or another commerically available A-B Ethernet driver ? I'm sure you have good reasons, but I'm curious to hear them.

What type of A-B controllers do you intend to communicate with ? It makes a difference; the PCCC protocol to talk to PLC-5E and SLC-5/05 is different from the CIP protocol used to communicate with Logix family controllers.

I don't know RSLinx or another commercially available A-B Ethernet driver (until now I have developed only one driver for a communication with Omron on serial).
And if I use another commercially driver and I have two different plcs, one can be AB for example and one of another manifacturer, are you sure that the commercially driver is compatible with the plc of other manifacturer?
And maybe can be less expensive to create a driver intead to buy it.
Anyway I need to know better how a driver for ethernet works...and I have to find something to study.
Bye.
Alex

I can use TCP on ethernet

I know that my plc has a library to communicate via TCP on ethernet (Write and Read functions implementated).
With this library I can put frames of bytes on the line.
But in which way the Siemens (or Allen Bradley) plc will recognize the values that I want to transfer to it?
I explain better: have I to know the format of frame that I have to send to the Siemens (or AB) plc? For example: first two bytes are reserved for the command code (write or read), the bytes numeber 3 and 4 are reserved for the memory address of the Siemens (or AB) plc, from bytes 5 to 8 I can write the value Iwant to transfer, byte 9 reserved for the Ceck-sum.
Or this is not necessary because the TCP is already a protocol and I have only to write (but in this case I ask: how can Siemens plc recognizes the value of the variable that I want transfer to it?) and
read? (and in this case I ask: how can I decide what I want read?)
Like you have understood I have the ideas a little bit confused. Who could clear these things please? Thank you very much.
Bye.