Examine If Open (XIO)
This information applies to the
CompactLogix
5370, ControlLogix
5570, Compact GuardLogix
5370, GuardLogix
5570, Compact GuardLogix
5380, CompactLogix
5380, CompactLogix
5480, ControlLogix
5580, and GuardLogix
5580 controllers.The Examine If Open (XIO) instruction examines the data bit to set or clear the rung condition.
Available Languages
Ladder Diagram
Operands
Ladder Diagram
Operand | Data Type | Format | Description |
|---|---|---|---|
Data bit | BOOL | tag | Bit to be tested. There are various operand addressing modes possible for the data bit, see Bit Addressingfor examples. |
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Index through arrays for array-indexing faults.
Execution
Ladder Diagram
Condition/State | Action Taken |
|---|---|
Prescan | N/A |
Rung-condition-in is false | Set Rung-condition-out to Rung-condition-in |
Rung-condition-in is true | If Data Bit is true, rung-condition-out is cleared to false. If Data Bit is false, rung-condition-out is set to true. |
Postscan | N/A |
Examples
Example 1
Ladder Diagram
If Limit_Switch_01 is false, the next instruction is enabled.
Example 2
Ladder Diagram
If S:V is false, this enables the next instruction.
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