Logix5000 Controllers General Instructions - SLAC Confluence

Appendix BFunction Block AttributesIntroductionThis appendix describes issues that are unique with function blockinstructions. Review the information in this appendix to make sureyou understand how your function block routines will operate.IMPORTANTWhen programming in function block, restrict the range of engineering units to+/-10 +/-15 because internal floating point calculations are done using singleprecision floating point. Engineering units outside of this range may result in aloss of accuracy if results approach the limitations of single precision floatingpoint (+/-10 +/-38 ).Choose the Function BlockElementsTo control a device, use the following elements:input reference (IREF)function blockoutput reference (OREF)output wireconnector(OCON)input wireconnector(ICON)641 Publication 1756-RM003I-EN-P - January 2007