Is Infinity (IsINF)
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 Infinity (IsINF) instruction tests whether the Source is infinity.
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 +INF or -INF. Set Rung-condition-out to true else Clear Rung-condition-out to false. |
Postscan | N/A |
Examples
Ladder Diagram
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