Experimental Physics and
Industrial Control System
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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: OPC with binary out records |
| From: | Carsten Winkler <[email protected]> |
| To: | <[email protected]>, <[email protected]> |
| Date: | Tue, 14 Aug 2012 14:56:08 +0200 |
|
Hallo Patrick,
the OPC specification for binary values says a zero value will be mapped to FALSE and all other numbers will be mapped to TRUE and stored as -1. If you start your OPC IOC it gets the current value from the OPC server for all OPC variables. The OPC server writes 0xffff for bo-records if they are true and so you get 65535 or -1 as integer value. If you want to get 0 for FALSE and 1 for TRUE you should use in your boolean records (bo and bi) the definition field(DTYP, "opc Raw") Carsten Hi, I am using the OPC device support module version 3.8.0.0 to connect to an OPC server supplied with Beckhoff TwinCAT 2.11. This is running on Windows 7 Professional with Service Pack 1. For the binary out records, if they are set to 1, and the EPICS OPC IOC is then restarted, their value is changed to 65535. If they are set to 0, and the EPICS IOC is then restarted, they remain set to 0. I do not think I have seen this behavior with the binary input records. Thank you for your time, Patrick Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V. Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv. Vorsitzende Dr. Beatrix Vierkorn-Rudolph Geschäftsführung: Prof. Dr. Anke Rita Kaysser-Pyzalla, Thomas Frederking Sitz Berlin, AG Charlottenburg, 89 HRB 5583 Postadresse: Hahn-Meitner-Platz 1 D-14109 Berlin http://www.helmholtz-berlin.de |
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