ControlLogix 5550: addressing syntax

The format for solicited DDE/OPC items for the ControlLogix processor is as follows:
  • For globally-scoped tags, use your user-defined tag names as the item names.
  • For program-scoped tags, use the format of
    Program:ProgramName.TagName
     for the item names. For example, if the program name is Power and tag is Output, the format for the item is Program:Power.Output.
  • The addressing syntax for a ControlLogix String UDT is STRING.DATA,SC# (where # is the number of characters). For example, use STRING.DATA,SC10 to read the first ten characters of STRING.DATA.
  • The addressing syntax for ControlLogix I/O bits is [Local|Remote]:<slot>:[I|O].Data/bit. For example: Local:2:O.Data/1.
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