SILOS – Save input string, load output string

Block SymbolLicensing group: STANDARD

Function Description
The SILOS block can be used to export or import a string to/from a file. The string is saved when a rising edge (off $\to$ on) occurs at the SAVE input and the string is also set to the sy output. The string is loaded at startup and when a rising edge (off $\to$ on) occurs at the LOAD input.

If a logical true (on) is brought to the APPEND input, the input string is added to the end of the file when it is saved. This mode is useful for logging events into text files. This input signal has no effect on loading from the file.

The LLO parameter is intended for choosing whether to load the entire file (off) or its last line only (on).

The outputs E and lastErr indicate an error during disk operation. The E indicator is reset on falling edge at the SAVE or LOAD input while the lastErr output holds the value until another disk operation is invoked.

Alternatively it is possible to write or read the string continuously if the corresponding flag (CSF, CLF) is set to on. The disk operation is then performed when the corresponding input is set to on. Beware, in that case the disk operation is executed in each cycle, which can cause excessive use of the storage medium. Thus it is necessary to use this feature with caution.

The fname parameter defines the location of the file on the target platform. The path is relative to the data folder of the RexCore runtime module.

Inputs

su	String input of the block $⊙$ 0	String
SAVE	Save string to file	Bool
LOAD	Load string from file	Bool
APPEND	Append saved string to file	Bool

Outputs

sy	String output of the block	String
E	Error indicator	Bool
	off .. No error on ... An error occurred
lastErr	Result of last operation	Long (I32)

Parameters

fname	Name of persistent storage file	String
CSF	Continuous saving	Bool
CLF	Continuous loading	Bool
LLO	Last line only loading	Bool
nmax	Allocated size of string $↓$ 0 $↑$ 65520	Long (I32)

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