Lenze DDS Function library MemDrv Manuel d'utilisateur télécharger pdf (Page 17)

Function library LenzeMemDrv.lib

Functions for RAM memory access

4.2 L_MemCopyFromRam

4−3

LenzeMemDrv.lib EN 1.1

Return value: Integer

Value Meaning

0 Copy job has been successfully transferred to the operating system.

−10 Copy job has not been transferred to the operating system since the transfer parameters are faulty:

wLength = 0.

−20 Copy job has not been transferred to the operating system since the transfer parameters are faulty:

pbyData does not point to the PLC memory area.

−30 Copy job has not been transferred to the operating system since the transfer parameters are faulty:

The values for wLength and wOffset do not fit together.

−40 Copy jopb has not been transferred to the operating system since the copy driver is still processing the previous memory

management function.

−50 Copy job has not been transferred to the operating system since the memory is presently accessed

(e. g. via codes).

−60 Copy job has not been transferred to the operating system since the transfer parameters are faulty:

byRamBlockNr is invalid.

−80 Function is not supported by the operating system.

Example

Calling the function in ST:

(* copy from RAM if last copy action (L_MemCopyFromRam) *)

(* is finished *)

nMemState := L_MemGetStateDriver(byVoid := 0);

bDriverBusy := INT_TO_BOOL(nMemState AND 16#0002);

IF bDriverBusy = FALSE THEN

nReturn := L_MemCopyFromRam(byRamBlockNr := 2,

wOffset := 512,

pbyData := ADR(g_abyDataBuffer),

wLength := 256);

END_IF

(* check return value of CopyFromRam function *)

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Lenze DDS Function library MemDrv Manuel d'utilisateur Page 17