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how to map variable with 64-bit swapped floats

 
Communication interfaces
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 sq.zheng@pcvue.com.cn
(@sq.zheng@pcvue.com.cn)
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Hi,

I got a question from one customer who needs to configure the modbus device with 64-bit swapped floats(function code is 04) variable, it seems PcVue do not have this kind of swapped float for 64-bit in the drop-down list of format.

I tried with modbus 64-bit floats, and PcVue can work although it pops up "format de la trame inconnu" .But i dont know how to configure the 64-bit swapped floats.

Maybe we can use scada basic to make it, but it's a bit complicated. Do you know how to configure with 64-bit swapped floats?

Thanks.

 
Posted : 04/08/2014 1:52 pm
e.mahaut
 e.mahaut
(@e-mahautarcinfo-com)
Posts: 270
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Hi Shu Guan,

The first thing to know is when using heterogeneous mapping, the frame format HAS to be WORD.
The second thing is you should only use the lower part of the mapping dialog box.
Then what is possible is the choice available.

Yet for 64 bits information, we only have 64 bits float with Modbus TCP/IP. If 64 bits swapped float is needed, you should declare a product evolution request.

For information, Modbus is native 16 bits information protocol. 32 bits words, 32 bits floats are artificially calculated in PcVue.

BR
Edouard

 
Posted : 04/08/2014 2:26 pm
 sq.zheng@pcvue.com.cn
(@sq.zheng@pcvue.com.cn)
Posts: 0
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Thanks, Edouard.

So we can only use scada basic to make it for the moment.

 
Posted : 06/08/2014 10:09 am
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