Move (MOVE)
The MOVE instruction moves a copy of the Source to the Dest. The Source remains unchanged.
Available Languages
Ladder Diagram
Structured Text
This instruction is not available in structured text.
TIP:
Use an assignment
:=
with an
expression to achieve the same result. Refer to Structured Text syntax for more information on the syntax of
expressions and assignments within structured text. Operands
IMPORTANT:
Unexpected operation may occur if:
- Output tag operands are overwritten
- Members of a structure operand are overwritten
- Except when specified, structure operands are shared by multiple instructions.
There are data conversion rules for mixing numeric data types within an instruction. See Data conversions.
Ladder Diagram
Numeric
Operand | Data Type | Format | Description |
|---|---|---|---|
Source | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | immediate tag | Value to move |
Dest | SINT INT DINT LINT USINT UINT UDINT ULINT REAL LREAL | tag | Tag to store the result |
Affects Math Status Flags
Conditional. See Math status flags.
Major/Minor Faults
A minor fault will occur if: | Fault type | Fault code |
|---|---|---|
Overflow detection feature is enabled and the Source value is outside the range of Dest type. | 4 | 4 |
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 | Set Rung-condition-out to Rung-condition-in. The instruction copies the Source into the Dest. |
Postscan | N/A |
Example
Ladder Diagram
Structured Text
value_2 := value_1;
value_3 := 'Test PASSED';
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