Exchnge

Exchange library

Filesystem

These FBs allows to export or import values between IEC61131-3 program variables and filesystem.

Exported values are stored in:

• PERM = 0: /tmp/metel/iec_61131-3/export/
• PERM = 1: /usr/local/metel/iec_61131-3/export

Imported values are primarily read from the temporary location /tmp/metel/iec_61131-3/import/. If this value is not found in the temporary location, it is searched in the permanent location /usr/local/metel/iec_61131-3/export.

Filename is composed as datatype.name

Reading and writing is proceed inside of program cycle, right at the moment, when it is called!

Each imported value should be called only once in each cycle, else it is possible to read different values in several calls.

To more precise timing of read and write to files, MEMORY AT variables should be used.

FS_EXPORT_BOOL

Exports boolean value to file

in	NAME	string		name of exported value
in	VALUE	bool		value to export
in	PERM	bool		0 - until reboot, 1 - permanent
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code

FS_EXPORT_INT

Exports signed integer value to file

in	NAME	string		name of exported value
in	VALUE	int		value to export
in	PERM	bool		0 - until reboot, 1 - permanent
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code

FS_EXPORT_UINT

Exports unsigned integer value to file

in	NAME	string		name of exported value
in	VALUE	uint		value to export
in	PERM	bool		0 - until reboot, 1 - permanent
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code

FS_EXPORT_REAL

Exports real integer value to file

in	NAME	string		name of exported value
in	VALUE	real		value to export
in	PERM	bool		0 - until reboot, 1 - permanent
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code

FS_EXPORT_STRING

Exports string value to file

in	NAME	string		name of exported value
in	VALUE	string		value to export
in	PERM	bool		0 - until reboot, 1 - permanent
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code

FS_IMPORT_BOOL

Imports boolean value from file

in	NAME	string		name of value to import
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code
out	VALUE	bool		imported value

FS_IMPORT_INT

Imports signd integer value from file

in	NAME	string		name of value to import
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code
out	VALUE	int		imported value

FS_IMPORT_UINT

Imports unsigned integer value from file

in	NAME	string		name of value to import
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code
out	VALUE	uint		imported value

FS_IMPORT_REAL

Imports real value from file

in	NAME	string		name of value to import
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code
out	VALUE	real		imported value

FS_IMPORT_STRING

Imports string value from file

in	NAME	string		name of value to import
out	ERR	bool		indicates some error occurs (0 = OK)
out	ERR_ID	uint		identifies occured error by unique code
out	VALUE	string		imported value