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Why do I get the error code OL9-21581 Illegal Modbus function code when trying to connect to the Concept simulator?


One possible reason is the package of Concept installed is Concept S or Concept Small. The small version of Concept does not contain the IEC 32 simulator.


Legacy KB System (APS) Data: RESL168253 V1.0, Originally authored by on , Last Edited by on
Related ranges: Concept
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