VIPA CP 1413plus, Руководство пользователя

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CP1413plus manual H1 Driver V3.xx for Windows NT
Rev. 00/07 7-67
Check read operation
#include <S5ACCESS.H>
USHORT WENTRY_C S5AbfrageLesen(S5_PARAMS W_POINTER s5)
The
S5AbfrageLesen
function determines whether the data that was previously requested by
means of a
S5StarteLesen
function is available. This function must be repeated until the data
becomes available or until an error message indicating a faulty connection is received.
Parameter s
s5
pointer to a structure of the type
S5_PARAMS
. The values
Kennung, DB, DW
and
Len
of the
s5
structure must contain valid
entries.
s5
must contain a valid connection number which was
returned by the function S5StarteVerbindung .
The function will either return a 0 or an H1 error.
If the returned value is 0 you can access the received data as follows:
PLCData[0]=(UCHAR*)s5+sizeof(S5_0;
PLCData[1]=(UCHAR*)s5+sizeof(S5_1;
Tab. 7-9 contains an overview of the H1 errors and their description.
Any S5 errors returned by the other station are located in
Fehler
.
Chapter 7.6.3.4 contains an overview of the S5 error codes. A 0 in
Fehler
indicates that the data transfer was completed properly.
Returns
0
H1_BAD_LINE
H1_WAIT_DATA
H1_NO_DRIVER
See also
S5LeseAusSPS
S5StarteLesen