Technical data

11.7.5 Example of a Program for Requesting Single DP Station
Diagnostics
The following figure shows the sequence of the HDB special service, A-Nr:
209 single DP station diagnostics.
Explanation of Fig. 11.25:
The special service "single DP station diagnostics" is triggered with SEND
A-NR: 209 and acknowledged with RECEIVE A-NR: 209.
It is acknowledged with the diagnostic data requested from the DP slave.
S5-Adr.
ANZW
ANR
SSNR
PAFE
CP
Job
L2-DP bus
FB
SEND
A-NR:
209
S5-Adr.
ANZW
ANR
SSNR
PAFE
FB
RECEIVE
Anzw = job_complete_without_error
(...4
H
)
Control program
Job
field
Anzw = job_active
(...2
H
)
A-NR: 209
Ack.
Data
DP slave
Request diagnostic
data
Acknowl. with
diagnostic data
Anzw = job_active receive possible (...3 )
H
Fig. 11.25 Sequence of HDB Special Service, A-Nr: 209 for Single DP Station Diagnostics
Distributed I/Os (DP) B89060/02
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