Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01 3.00
Summary:
Question: If I call SemOpen("device=56", 1); the semaphore will not be named correctly. Is this valid?  

Solution:
You must use valid tag names for semaphore names. that is must start with a letter and can only contain letters, numbers and the '_' underscore character. When you call SemOpen("device=56", 1); the semaphore will be created with the name 'device', then if you try to open in mode 0, the call will fail as it will not be able to find the matching name. 
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