Technical data

FBs for Cyclical Access to User Data according to the PNO
System Software for S7-300/400 System and Standard Functions - Volume 1/2
A5E00709327-01
18-5
Parameter Declaration Data Type Memory Area Description
ID INPUT DWORD I, Q, M, D, L
constant
• Low word: logical address of the
DP slave/ PROFINET IO
component (module or
submodule)
• High word: irrelevant
OFFSET INPUT INT I, Q, M, D, L
constant
Number of the first byte to be read in
the process image for the component
(smallest possible value: 0)
LEN INPUT INT I, Q, M, D, L
constant
Amount of bytes to be read
STATUS OUTPUT DWORD I, Q, M, D, L Contains error information for SFC 81
"UBLKMOV" in the form
DW#16#40xxxx00 if ERROR = TRUE
ERROR OUTPUT BOOL I, Q, M, D, L Error display:
ERROR = TRUE if an error occurs
when calling SFC 81 "UBLKMOV".
INPUTS IN_OUT ANY I, Q, M, D Target area for read data:
• If the target area is smaller than
LEN, then as many bytes as
INPUTS can accept are
transferred. ERROR receives the
value FALSE.
• If the target area is greater than
LEN, then the first LEN bytes of
the target area are written.
ERROR receives the value
FALSE.
Error Information
See Uninterruptible Copying of Variables with SFC 81 "UBLKMOV".