Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Thu, 21 Aug 2008 09:12:27 +0200

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.

------------------------------------------------------------------------

ÒÁÀû£ºÓÐÃÎÏë£¬¾ÍÓÐÏÂÒ»´Î·ÉÏè¡£ÆÚ´ýÁõÏèÍõÕß¹éÀ´¡£
<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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System