All,
I have been told negative logic Input/Output devices are not allowed in
Europe. I have found the following in EN61131-2:1994 (IEC 1131-2) Page 28,
Para 3.3, note 1
"Current souring inputs and current sinking outputs which may be required
for certain applications are not covered in this standard. Special care
should be exercised in their uses."
This says current sinking outputs are permitted. Can anyone point to
anything that prohibits them?
Dan Kinney
Horner APG
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