Festo CPX-FB13 - Page 133

A. Technical appendix
A−11
Festo P.BE−CPX−FB13−EN en 0811c
Siemens S7  SFC 59 and 58
Function module SFC 59 in STL for reading a data record:
STL Explanation
CALL SFC 59”RD_REC”
REQ :=TRUE Request to read
IOID :=B#16#54 Identifier of the address range (here always 54)
LADDR :=W#16#6 Logical address of the field bus node
(see mask Properties  DP slave" in HW Config)
RECNUM :=B#16#14 Data record number 20 (see Tab.A/8)
RET_VAL :=MW100 If faults occur, output fault code
RECORD :=P#M110.0 BYTE 8 Target range for data record read and length of data record
BUSY :=M10.0 Reading in process
Fig.A/2: Example program for reading out the diagnostic memory status
Function module SFC 58 in STL for writing a data record:
STL Explanation
CALL SFC 58”WR_REC”
REQ :=TRUE Request to write
IOID :=B#16#54 Identifier of the address range (here always 54)
LADDR :=W#16#6 Logical address of the field bus node
(see mask Properties  DP slave" in HW Config)
RECNUM :=B#16#14 Data record number 20 (see Tab.A/8)
RECORD :=P#M130.0 BYTE 8 Pointer at start of data range for diagnosis
and length of diagnostic data
RET_VAL :=MW102 If faults occur, output fault code
BUSY :=M10.1 Writing in process
Fig.A/3: Example program for transmitting the diagnostic memory status