Operation of the DP/PA Link and the Y Link
8-2
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Table 8-1 Configured start-up characteristics
Configured start-up
characteristics
The output data is issued by the link if...
Start-up when the desired layout
0 actual layout
All slaves are parameterized and configured, or
The startup delay has expired and fewer slaves
were parameterized/configured than planned.
Start-up when the desired layout
= actual layout
All the slaves are parameterized and configured.
Note:
If not all slaves are configured or parameterized within
the power-up delay time, the link automatically repeats
start-up.
The status of the start-up delay can be evaluated in the ”Status Message”
diagnostic block of the diagnostic frame.
8.2 Start-up characteristics
Prerequisites for starting up the IM 157
A valid PROFIBUS address must be set on the IM 157.
The DP master on the higher level PROFIBUS-DP must be in operation.
The link must be configured correctly.
The further behavior of the DP/PA link depends on whether it is in redundant or
non-redundant operation.
8.2.1 Start-up behavior of the DP/PA link in non-redundant operation
The flow chart below shows the start-up behavior of the IM 157 after the power is
switched on.
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