Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 655
Appendix
B
Function Block Attributes
Introduction
This appendix describes issues that are unique with function block instructions.
Review the information in this appendix to make sure you understand how your
function block routines will operate.
Function Block Elements
To control a device, use these elements.
When programming in function block, restrict the range of
engineering units to +/-10
+/-15
because internal floating
point calculations are done by using single precision
floating point. Engineering units outside of this range may
result in a loss of accuracy if results approach the
limitations of single precision floating point (+/-10
+/-38
).
Input Reference (IREF) Function Block
Output Wire
Connector
(OCON)
Output Reference (OREF)
Input Wire
Connector
(ICON)
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