Technical data

Example of a program for reading out the DP diagnostic list
The following figure shows the sequence of the HDB special service A-NR
209 for reading out the DP diagnostic list.
Explanation of Fig. 11.22:
The "DP diagnostic list" special service is triggered with SEND A-NR: 209
and acknowledged with RECEIVE A-NR: 209. The acknowledgment is
made with the local CP data.
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 receive possible (...3 )
H
A-NR: 209
Ack.
Data
Anzw = job_active
(...2
H
)
Fig. 11.22 Sequence of HDB Special Service, A-NR: 209 for Read Out DP Diagnostic List
B8976060/02 Distributed I/Os (DP)
11 - 49 Volume 1