Boolean Exclusive OR (BXOR)
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 BXOR instruction performs an exclusive OR on two Boolean inputs.
Available Languages
Ladder Diagram
This instruction is not available in ladder diagram.
Function Block Diagram
Function Block Diagram supports these elements:
FBD Block
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Structured Text
This instruction is not available in structured text.
Operands
Function Block Diagram
FBD Block
Operand | Data Type | Format | Description |
|---|---|---|---|
BXOR tag | FBD_BOOLEAN_XOR | Structure | BXOR structure |
FBD_BOOLEAN_XOR Structure
Input Members | Data Type | Description |
|---|---|---|
EnableIn | BOOL | Enable input. If cleared, the instruction does not execute and outputs are not updated.
Default is set. |
In1 | BOOL | First Boolean input.
Default is cleared. |
In2 | BOOL | Second Boolean input.
Default is cleared. |
Output Members | Data Type | Description |
|---|---|---|
EnableOut | BOOL | Indicates if instruction is enabled. |
Out | BOOL | The output of the instruction. |
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Input Operands (Left Pins) | Data Type CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Description |
|---|---|---|
In1 | BOOL | First Boolean input. |
In2 | BOOL | Second Boolean input. |
Output Operands (Right Pin) | Data Type CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers | Description |
|---|---|---|
Out | BOOL | The output of the instruction. |
SeeFBD FunctionsFBD Functions.
Operation
The BXOR instruction performs an exclusive OR on two Boolean inputs.
Out = In1 XOR In2
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction.
Execution
Function Block Diagram
FBD Block
Condition/State | Action Taken |
|---|---|
Prescan | EnableIn and EnableOut bits are cleared to false. |
Tag.EnableIn is false | EnableIn and EnableOut bits are cleared to false. |
Tag.EnableIn is true | EnableIn and EnableOut bits are set to true. The instruction executes as described in the Operation section. |
Instruction first run | N/A |
Instruction first scan | N/A |
Postscan | EnableIn and EnableOut bits are cleared to false. |
FBD Function
TIP:
FBD Function is applicable to CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, Compact GuardLogix 5380, and GuardLogix 5580 controllers only.
Condition/State | Action Taken |
|---|---|
Prescan | N/A |
Normal Scan | Out = In1 XOR In2 |
Instruction first run | N/A |
Instruction first scan | N/A |
Postscan | N/A |
Example
Function Block Diagram
In this example, bool_in1 is copied into BXOR_02.In1, bool_in2 is copied into BXOR_02.In2, the result of performing an exclusive OR on BXOR_02.In1 and BXOR_02.In2 is placed into BXOR_02.Out, and BXOR_02.Out is then copied into value_result_xor.
If bool_in1 is: | If bool_in2 is: | Then value_result_xor is: |
|---|---|---|
0 | 0 | 0 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 0 |
FBD Block
This example illustrates performing an exclusive OR on bool_in1 and bool_in2 and places the result in value_result_xor.
FBD Function
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