Experimental Physics and Industrial Control System
Hello
record (ao, "$(RECORDNAME)") {
field (DTYP, "S7plc")
field (OUT, "@$(PLCNAME)/$(OFFSET) T=INT32")
field (LINR, "Linear")
field (EGUL, "-214748.3647")
field (EGUF, "214748.3647")
}
214748.3647 = 0x7FFFFFFF / 1000.
When using an INT data type with an ao record, the driver uses the RVAL field.
Tell the record to convert VAL to RVAL by setting LINR="Linear" and provide the
limits for conversion. Write the min and max float values to EGUL and EGUF and
the min and max integer values to the link in L=... and H=...
The defaults for min and max integer are L=-2147483647 and H=2147483647 for a 32
bit signed integer. You can choose other limits if they apply better to your
application:
record (ao, "$(RECORDNAME)") {
field (DTYP, "S7plc")
field (OUT, "@$(PLCNAME)/$(OFFSET) T=INT32 L=0 H=9999999")
field (LINR, "Linear")
field (EGUL, "0.0")
field (EGUF, "999.9999")
}
Dirk
marco_hair wrote:
hi,all:
I am using S7 plc driver written by dirk.zimoch. If I want to exchange
interger value(1234567) between IOC and PLC using ai/ao record(that's
because plc uses interger format data), but in edm's gui, the data
format(123.4567) is float type. how can I do this?
1. I can use an additional record such as calc to convert.
2. I can exchange float data directly between ioc and plc if changing
plc program.
while I don't want to take these ways, Are there any other ways? such as
using linear convert of ai/ao, etc.? is it possible?
Thanks a lot in advance.
------------------------------------------------------------------------
伊利:有梦想,就有下一次飞翔。期待刘翔王者归来。
<http://popme.163.com/link/004758_0820_5283.html>
--
Dr. Dirk Zimoch
Paul Scherrer Institut, WBGB/006
5232 Villigen PSI, Switzerland
Phone +41 56 310 5182
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