Parameters
Parameter Declaration Data type Memory block Description
REQ INPUT BOOL I, Q, M, D, L,
constant
REQ = 1: read request
LADDR INPUT WORD I, Q, M, D, L,
constant
The configured diagnostic address of the DP
slave
RET_VAL OUTPUT INT I, Q, M, D, L return value
RECORD OUTPUT ANY I, Q, M, D, L Target area for the diagnostic data that has
been read. Only data type BYTE is valid. The
minimum length of the read record or respec-
tively the target area is 6. The maximum
length of the read record is 240. When the
standard diagnostic data exceeds 240bytes
on a norm slave and the maximum is limited
to 244bytes, then only the first 240bytes are
transferred into the target area and the
respective overflow-bit is set in the data.
BUSY OUTPUT BOOL I, Q, M, D, L BUSY = 1: read operation has not been com-
pleted.
The CPU tests the actual length of the diagnostic data that was read:
When the length of RECORD
n is less than the amount of data the data is discarded and the respective error code is
entered into RET_VAL.
n is larger than or equal to the amount of data then the data is transferred into the
target areas and RET_VAL is set to the actual length as a positive value.
It is essential that the matching RECORD parameters are be used for all
calls that belong to a single task. A task is identified clearly by input
parameter LADDR and RECORD.
The following conditions apply if the amount of standard diagnostic data of the norm slave
lies between 241 and 244bytes:
When the length of RECORD
n is less than 240bytes the data is discarded and the respective error code is entered
into RET_VAL.
n is greater than 240bytes, then the first 240bytes of the standard diagnostic data are
transferred into the target area and the respective overflow-bit is set in the data.
RECORD
Norm slaves
VIPA SPEED7
Integrated Standard
System Functions > SFC 13 - DPNRM_DG - Read diagnostic data of a DP slave
HB00 | OPL_SP7 | Operation list | en | 18-30 658
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