FUNCTION_BLOCK RDIAG
Read Diagnosis data from DP Slave.
This service is for Profibus only, Profinet uses a different, more advanced Diagnosis.
Code-Example: Profibus DP Diagnosis
PROGRAM PLC_PRG
VAR
readDiag : CommfB.RDIAG;
diag : CommFB.DP_DIAG;
sMessage : STRING;
END_VAR
readDiag.REQ := TRUE;
readDiag.ID := CommFB.ID(EN := TRUE, Master := CIFX_PB.MasterID, SEGMENT := 0, STATION := 3, SLOT := 0);
readDiag.MLEN := TO_INT(SIZEOF(diag));
readDiag(DINFO := diag);
IF(readDiag.VALID) THEN
IF(diag.status1.Diag.Station_Non_Existent) THEN
sMessage := 'Station with Address = 3 is not available !';
END_IF
END_IF
InOut:
|
Scope |
Name |
Type |
Comment |
|
Input |
REQ |
BOOL |
Request |
|
ID |
DWORD |
Identifier of a of DP-slave (see: AddressConcept) |
|
|
MLEN |
INT |
maximum length to be read |
|
|
Output |
VALID |
BOOL |
New diagnosis data received and is valid |
|
BUSY |
BOOL |
FB is busy |
|
|
ERROR |
BOOL |
Error detected |
|
|
STATUS |
DWORD |
Last detected status |
|
|
LEN |
INT |
Length of diagnosis data |
|
|
Inout |
DINFO |
Read diagnosis data (see: DP_DIAG |
