Diagnostic Possibilities with S7
and PB DP
109
05/01 AWB2700-1384GB
9
Parameter Declaration Data Type Memory
Location
Description
REQ INPUT INPUT E, A, M, D, L,
Konst
REQ = 1: reading request
LADDR INPUT WORD E, A, M, D, L,
Konst
Configured diagnostic address of
the DP slave
RET_VAL OUTPUT INT E, A, M, D, L If an error occurs while processing
the function, the returned value
contains an error code. If no error
occurred, the length of the
actually transmitted data is held
in RET_VAL.
RECORD OUTPUT ANY E, A, M, D, L Target area for the read
diagnostic data. Only the BYTE
data type is allowed. The
minimum length of the data set to
be read and/or the target area is
6. The maximum length of the
record to be sent is 240; if
standard slaves are used whose
standard diagnosis data is
between 240 bytes and 244 bytes
(max.), the first 240 bytes are
transmitted into the target area.
The corresponding overflow bit is
set in the data.
BUSY OUTPUT BOOL E, A, M, D, L BUSY = 1: the reading process is
not yet complete.
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