ECOM comm with Ethernet SDK

[ycloo]

Just want to know what is the return value of a successful call to Ethernet SDK calls like
1) HEIOpen
2) HEIOpenTransport
3) HEIQueryDevices

So far, I'm getting a return value of 0 to all of these calls.
Thanks.

[franji1]

Just want to know what is the return value of a successful call to Ethernet SDK calls like
1) HEIOpen
2) HEIOpenTransport
3) HEIQueryDevices

So far, I'm getting a return value of 0 to all of these calls.
Thanks.

That's it!  0 means "no error code".  If you look at the HEI.H file, there are some HEIE_* "error" return codes like
#define HEIE_TIMEOUT 0x8006   /* Timeout error */

[ycloo]

Thanks Franji1!

I'm currently able to read V memory register using HEICCMRequest. Can I know what command to use to read Input & Coils?

[franji1]

It's the same call, just different parameters.  I don't have the DirectNET specification, but bits are read on byte boundaries, a byte at a time (note that C, X, and Y bits are "octal").

The offsets, I'm sure, are byte offsets, so the offset for C0 is OFFSET, then the offset for C10 (octal) is (OFFSET + 1).  Again, these are in the DirectNET specification, which is available free from ADC's website.

[ycloo]

Oh, it's using the same call? I was trying to use HEIReadIO/HEIWriteIO...

[franji1]

Actually, I'm wrong.  It is those methods (HEIReadIO/HEIWriteIO).  What I was referring to was the CCM Request, which is not applicable for EBCs, but only ECOM* modules with PLC CPUs, not EBC CPUs.

[MikeS]

on our web, on the same page you downloaded the ethernet sdk, there is a PDF (CCMDetails.PDF) that contains the CCM protocol details you'll use to read & write all of the PLC data types.

You'll use the same API call - HEICCMRequest() - to read and write all of the PLC data types. There is a parameter for read vs write, one for data type, one for offset, and one for length.

[ycloo]

Hi MikeS

I can't seem to find the definition of the data types. I have no idea 0x31 refers to which data type. Please advice.

[MikeS]

data type 31 is used to read and write ladder program memory. our intention for the ethernet sdk is reading and writing v-memory and i/o memory, but not to change the ladder program.

information regarding reading and writing ladder memory is not available from us.

[BobO]

Ummm...actually data type 0x31 is registers...V memory. Data type 0x37 is program memory.

All of the data types should be described in the DirectNet manual...where ever that is.

[b_carlton]

Manual is here: http://www.automationdirect.com/static/manuals/dadnet/dadnet.pdf. Data type numbers on page 6-5

[BobO]

Thanks Bernie!

[MikeS]

oops, my bad ... i was off by one line in my own chart. geez.

[Controls Guy]

Damned parallax!   

[BobO]

Hey, easy there Darth...physics is our phriend! And it's phun, too! At least that's what my physics teacher always used to say. He was kinda weird though. Big forehead, mostly bald, short....crap...he was an alien. Can't believe it took this long to figure that out...