REAL to String (RTOS)
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 REAL to String (RTOS) instruction produces the ASCII representation of a REAL value.
Available Languages
Ladder Diagram
Function Block
This instruction is not available in function block.
Structured Text
RTOS(Source,Dest);
Operands
Ladder Diagram and Structured Text
Operand | Type | Format | Description | Notes |
|---|---|---|---|---|
Source | REAL | Tag | The tag that contains the REAL value | |
Destination | String type | Tag | The tag to store the ASCII value | String types are:
|
See
Structured Text Syntax
for more information on the syntax of expressions.Description
The RTOS instruction converts the Source to a string of ASCII characters and places the result in the Destination.
Affects Math Status Flags
No
Major/Minor Faults
Type | Code | Cause | Recovery Method |
|---|---|---|---|
4 | 52 | The output string is larger than the destination | Create a new string type that is large enough for the output string. Use the new string type as the data type for the destination. |
See
Common Attributes
for operand-related faults.Execution
Ladder Diagram
Condition/State | Action Taken |
|---|---|
Prescan | N/A |
Rung-condition-in is false | N/A |
Rung-condition-in is true | The instruction executes. |
Postscan | N/A |
Structured Text
Condition | Action |
|---|---|
Prescan | See Prescan in the preceding Ladder Diagram table |
Normal execution | See rung-condition-in is true in the preceding Ladder Diagram table. |
Postscan | See Postscan in the preceding Ladder Diagram table |
Examples
When send_data is set, the RTOS instruction converts the value in data_1 to a string of ASCII characters and places the result in data_1_ascii. Subsequent rungs insert or concatenate data_1_ascii with other strings to produce a complete message for a display terminal.
Ladder Diagram
Structured Text
IF send_data THEN
RTOS(data_1,data_1_ascii);
send_data:= 0;
END_IF;
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