Siemens DP/AS-Interface Link 20E, Manual

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Data Exchange Between the DP Master and AS-i Slave
57
DP/AS-Interface Link 20E
Release 11/2002
C79000-G8976-C138–04
Table 2-2 Parameters for Sending/Receiving
DP-V1 SIMATIC S7 (SFC 58/59) For PC: DP programming
interface (dpc*_read/write)
Meaning
PROFIBUS
address LADDR
(the start address of the
cyclic input bytes of the
DP/AS-i Link must be
specified (see also Section
1.9). The S7 CPU calculates
the PROFIBUS address from
this information.)
C_Ref PROFIBUS address of the
DP/AS-i Link (DP slave)
IOID
The following fixed value
must be entered: B#16#54
– Fixed value
Slot_number Is calculated from LADDR;
Not an SFC parameter
Slot_number With DP/AS-i Link:
Any value
Index RECNUM Index Data record number
(140–147; see Table 2-3)
Length RECORD
Referenced using ANY
pointer
Length_s Length of the input/output
data area
Data RECORD
Referenced using ANY
pointer
Data_s Address of the input/output
data area
RET_VAL
BUSY Return parameter for
execution check
You will find sample programs for SIMATIC S7 in Section 2.4.3