Good day ladies and gents, What happens in a CALC function block when an OR function is used with a stack that includes a real value. For example, what is written out to BO01 in the following case? IN BI01; = False IN RI01; = 13.0 IN BI02; = False IN BI03; = False OR; OUT BO01 = ? Does this produce an error? Does the result depend on the value of RI01? I am reverse-engineering some old I/A logic and I do not have access to a simulator to test and see what will happen in this situation. Can someone please help me out? Regards, Quay -- Quay B. Finefrock PSD Controls Pte. Ltd. Phone: +65 9327 2923 (Singapore) +673 883 1480 (Brunei) +60 17 820 6900 (Malaysia) Email: Quay@xxxxxxxxxxxxxxxx _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave