Technical data

All the bits of the DP slave stations, for which there was no configura-
tion in the DP editor, (-> no input/output areas configured), are identified
with "0". These DP slave stations are known as passive DP stations
and are ignored in the station list.
This also applies to DP stations with which cyclic data exchange is
running free of error.
For all DP slave stations not in the cyclic data transfer phase, the DP
station bit is set to "1"
This is the case when the DP slave station does not acknowledge on
the bus or is not yet completely initialized.
When a DP station is first initialized, the DP station bit is kept at "0"
during the initialization.
➣
Read out DP diagnostic list
The DP diagnostic list indicates whether there are any new diagnostic
data from the DP slaves and has a length of 16 bytes (128 bits).
Each bit of the DP diagnostic list corresponds to one of the possible
bus addresses of the DP slave stations.
15
76543210
120 127 *)
0
1
76543210
76543210
01234567
8 9 10 11 12 13 14 15
2 - 14
16 - 119
Byte
Bit
Station
address
124
*) The first and last two bits in the station list are not relevant, since the permitted
station address on the L2 bus must be in the range 1-125
Fig. 11.19 Structure of the DP Diagnostic List
B8976060/02 Distributed I/Os (DP)
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