Sequencer Load (SQL)
The SQL instruction loads the source operand value into the sequencer array.
When .EN transitions from false to true, the .POS is incremented. The .POS is reset to 1 when the .POS becomes > or = to .LEN. The SQL instruction loads the Source value into the Array at the new position.
When .EN is true the SQL instruction loads the Source value into the Array at the current position.
Typically use the same CONTROL structure as the SQI and SQO instructions.
IMPORTANT | You must test and confirm that the instruction does not change data that you don’t want it to change. |
Available Languages
Ladder Diagram
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Operands
The data conversion rules for mixed data types within an instruction. See Data Conversion.
Operand | Type | Format | Description |
Array | DINT | array tag | Sequencer array Specify the first element of the sequencer array do not use CONTROL.POS in the subscript |
Source | SINT INT DINT | tag immediate | Data to load into the sequencer array at a location specified by .POS. |
Control | CONTROL | tag | Control structure for the operation The same control tag should be used in the SQI and SQO instructions |
Length | DINT | immediate | This represents the CONTROL structure .LEN. |
Position | DINT | immediate | This represents the CONTROL structure .POS. |
CONTROL Structure
Mnemonic | Data Type | Description |
|---|---|---|
.EN (Enable) | BOOL | The enable bit indicates the SQL instruction is enabled. |
.DN (Done) | BOOL | The done bit is set when all the specified elements have been loaded into Array. |
.ER (Error) | BOOL | The error bit is set when .LEN < or = to 0, .POS < 0, or .POS > .LEN. |
.LEN (Length) | DINT | The length specifies the number of sequencer steps in the sequencer array. |
.POS (Position) | DINT | The position identifies where in the Array the Source value will be stored. |
Affects Math Status Flags
No
Major/Minor Faults
A major fault will occur if: | Fault Type | Fault Code |
|---|---|---|
position > size of Array | 4 | 20 |
Execution
Condition/State | Action Taken |
|---|---|
Prescan | The .EN is set to true. |
Rung-condition-in is false | The .EN is cleared to false |
Rung-condition-in is true | See Flow Chart (True) |
Postscan | N/A |
Flow Chart - True
Example
Ladder Diagram
When enabled, the SQL instruction loads value_3 into the next position in the sequencer array, which is array_dint[5] in this example.
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