Is Not a Number (IsNAN)
This table lists the controllers and applications that support this instruction.
Architecture | Standard applications | Safety applications |
|---|---|---|
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Yes | Yes |
When enabled, the Is Not a Number (IsNAN) instruction tests whether the source is not a number.
Available Languages
Ladder Diagram
Function Block Diagram
This instruction is not available in Function Block Diagram.
Structured Text
This instruction is not available in structured text.
Operands
Ladder Diagram
Operand | CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers Data Type | Format | Description |
|---|---|---|---|
Source | REAL LREAL | tag | Value to test against Infinity |
Affects Math Status Flags
No
Major/Minor Faults
This instruction does not generate any major/minor 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 Source is NAN. Set Rung-condition-out to true else Clear Rung-condition-out to false. |
Postscan | N/A |
Examples
Ladder Diagram
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