Operation of the DP/PA Link and the Y Link
8-7
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
8.4 Reading and writing records
Depending on the operating mode of the DP master (S7-compatible or DPV1),
records of the IM 157 and the underlying slaves can be read and written by
different methods.
Reading records with SFC 59 “RD_REC” or SFB 52 “RDREC”
Writing records with SFC 58 “WR_REC” or SFB 53 “WRREC”
Reading and writing records with a programming device/PC via communication
links, e.g. with SIMATIC PDM
Table 8-3 Methods for reading and writing records
S7-compatible DP master DPV1 master
Records of the IM 157 SFC 59 “RD_REC”
Read with programming
device/PC
SFC 59 “RD_REC”,
SFB 52 “RDREC”
SFC 58 “WR_REC”,
SFB 53 “WRREC”
Read/write with
programming device/PC
Records of underlying
slaves
Read/write with
programming device/PC
SFC 59 “RD_REC”,
SFB 52 “RDREC”
SFC 58 “WR_REC”,
SFB 53 “WRREC”
Read/write with
programming device/PC
Records of the IM 157
Depending on the operating mode of the DP master (S7-compatible or DPV1), the
IM 157 support reading and writing of the following records:
On the DPV1 master:
– Records 0 and 1 (diagnostic data, read only)
– Records 248 … (identification data, see Section 8.5)
On the S7-compatible master
– Records 0 and 1 (diagnostic data, read only)
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