When should I use an SOVR instruction instead of an SCMD instruction?

When should I use an SOVR instruction instead of an SCMD instruction?

  • Under most circumstances, use the SCMD instruction to programmatically command an
    Equipment Sequence
    . However, use the SOVR instruction to command an
    Equipment Sequence
     under these conditions:
    • When you are giving the HOLD, STOP, or ABORT command, and the command must always execute under all ownership circumstances.
    • If the HOLD, STOP, or ABORT command must execute even when you have manual control of the
      Equipment Sequence
       through the
      Logix Designer
       application or when another program, such as the
      FactoryTalk Batch
       software, owns the
      Equipment Sequence
      .
For example, suppose your equipment checks for jammed material. If there is a jam, you always want the equipment to abort. In that case, use the SOVR instruction. This way, the equipment aborts even if you have manual control through the
Logix Designer
 application.
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