MultiTool Creator code template automatically includes NVMemory (PRG) which handles non-volatile memory operations using SSeriesHardware library's NVMem (PRG).

All memory areas use the ParameterHandler library for handling the images between RAM and NVRAM. Parameter handler also checks the image integrity.

It is NOT recommended to save parameters in every program cycle. Especially OD parameter saving can be time consuming (depends on amount of parameters).

CANopen OD parameter saving can also be done from the CAN bus with SDO protocol but it is not covered by this example.

Refer to the following for adjusting and saving control unit OD parameters from a 6000 series unit:

• Parameters library

• ParametersSave (FB)

It is recommended to add new variables to the end of the structure.

Variable data types should not be changed in existing systems, to maintain integrity of the image.

Application default values are used when:

• NVRAM is empty (new unit)

• Both primary and backup memory area is corrupted.

Definitions:

TYPE FastParameters :

STRUCT

FastParameter1: BYTE;

FastParameter2: WORD;

FastParameter3: DWORD;

END_STRUCT

END_TYPE

Definitions:

VAR

local_var:BYTE;

trigger:BOOL;

trigger_old:BOOL;

END_VAR

Code:

G_Common.FastParameters.FastParameter1 := local_var;

IF trigger AND NOT trigger_old THEN

G_Common.SaveFastParameters := TRUE;

END_IF

trigger_old:=trigger;

Definitions:

odSaveResult: EPEC_ODSAVE.SaveODErrors;

Code:

(*save parameters to nvram*)

G_CANopen_CAN1.SaveAll.Callback(o_Error => odSaveResult);