Lenze DDS Function library MemDrv Manuel d'utilisateur télécharger pdf (Page 21)

Function library LenzeMemDrv.lib

Functions for RAM memory access

4.5 L_MemReadDWORD

4−7

LenzeMemDrv.lib EN 1.1

4.5 L_MemReadDWORD

DWORD L_MemReadDWORD(byRamBlockNr, wOffset)

This function can be used to read a 32−bit value of type "double word" from a RAM block of the PLC.

wOffset

Block 1 (64KByte)

Block 2 (64 KByte)

RAM

byRamBlockNr

Block n (64 KByte)

Double Word

(32 Bit)

return value

Transfer parameters

Identifiers Data type Info/possible settings

byRamBlockNr Byte Selecting the RAM memory block from which the 32−bit value is to be read.

1 RAM memory 1, size: 64 kbytes

2 RAM memory 2, size: 64 kbytes

wOffset Word Start address within the selected RAM memory block from which the 32−bit value is to be read.

0 ... 65532 Start address (offset)

Return value: Double word

Value Meaning

Data 32−bit value read in the RAM memory block byRamBlockNr from position wOffset.

ZERO Read request has not been transferred to the operating system since the transfer parameters are faulty:

byRamBlockNr is invalid.

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Lenze DDS Function library MemDrv Manuel d'utilisateur Page 21