DNet EDS files

Alan Case

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Join Date
Apr 2002
Location
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Posts
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I have a VSD on devicenet whose EDS file is wrong. It looks like the author did a copy and paste of the preceding parameter and did not change all the text. To explain it a bit more parameter 196 is meant to be the enable of the thermistor circuit but it is described the same as parameter 195. Is there somewhere that details how an EDS is constructed and if the EDS can be altered do you have to un register and then re register the altered EDS or is it possible just to replace the EDS file with the new one.
I have attached the EDS as a text file if anyone is interested. Regards Alan Case
 
Alan I went to odva.org and got an EDS file but had to copy and save it with Notebook. I dont see why you couldnt open the file and make the necessary modifications. I dont know about the registering part, the file error may just be a typo.
 
Notepad is fine for editing EDS files. Yes, you will have to register the altered file. Can you not obtain the right EDS file for the device? Either the manufacturers website or ODVA.
beerchug
 
I have the latest file from the manufacturer, but I assume that thei EDS is a little used item. A HMS devicenet adaptor for a fugi VFD where I am using the thermistor connection. I am just trying to save the time of going back to the manufacturer. Regards Alan
 
I think this EDS is only a little bit off:

Param196=
0,
6, "20 64 24 01 30 BD",
0x0000, 2, 2,
"H27 PTC thermistor (Level)",
"",
"",
0, 65535, 160,
1, 1, 1, 0,
0, 0, 0, 0,
0;

The PTC thermistor level threshold parameter is called out as parameter H27 in the user manual (http://www.geindustrial.com/products/manuals/GEI-100363.pdf).

I think the min/max/default should read "0, 500, 160" to match the parameter's stated limits of 5.00 volts maximum and 1.60 volts default.

But there's nothing inherently wrong with this EDS entry. What I don't see is an EDS parameter entry for the PTC Mode, to enable or disable it. I can't say why that is.

If you did want to change the EDS, you'd have to unregister it in the RSNetworx EDS Wizard, re-register it, then stop and start RSNetworx to get it into the hardware list correctly again.
 
Hi Ken. thanks for the answer.
Here is an excerpt of the EDS.

Param194=
0,
6, "20 64 24 01 30 BB",
0x0000, 2, 2,
"H25 PID control (Feedback filter)",
"",
"",
0, 65535, 5,
1, 1, 1, 0,
0, 0, 0, 0,
0;

Param195=
0,
6, "20 64 24 01 30 BC",
0x0000, 2, 2,
"H26 PID control (Feedback filter)",
"",
"",
0, 65535, 0,
1, 1, 1, 0,
0, 0, 0, 0,
0;

Param196=
0,
6, "20 64 24 01 30 BD",
0x0000, 2, 2,
"H27 PTC thermistor (Level)",
"",
"",
0, 65535, 160,
1, 1, 1, 0,
0, 0, 0, 0,
0;

Parameter 195 is meant to be the enable of the PTC. ie able to be set at 1 or 0. The interface is supplied by HMS anybus who I thought would have managed to get the file a bit closer to right then this. Regards Alan Case
 
Oh, I get it now. H is the parameter category, H26 is Thermistor Enable, and H27 is Thermistor Level.

I agree that somebody made an error. You can simply change the text description, maybe reduce the Maximum value from 65535 to 1. Then merely enter a "1" for the value.

If you want to explore the DNet EDS further for academic reasons:

I don't know for sure if this is an Unsigned Integer data type object (leading to the default 65535 maximum) or if it's a Boolean data type object. I don't want to recommend messing with the encoded Data Type or the Enumerated parameters yet.

Try using the SCIA explicit message editor (right-click in RSNetworx) to send a Get Attribute Single service message to Class 0x64, Instance 1, Attribute 0xBC. See if the returned data is one byte or two.
 

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