Start-Up Characteristics; Start-Up Behavior Of The Dp/Pa Link In Non-Redundant Operation; Configured Start-Up Characteristics - Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual

Operation of the DP/PA Link and the Y Link
Table 8-1

Configured start-up characteristics

Configured start-up
characteristics
Start-up when the desired layout
0 actual layout
Start-up when the desired layout
= actual layout
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
S A valid PROFIBUS address must be set on the IM 157.
S The DP master on the higher level PROFIBUS-DP must be in operation.
S 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.
8-2
The output data is issued by the link if...
S
All slaves are parameterized and configured, or
S
The startup delay has expired and fewer slaves
were parameterized/configured than planned.
S
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.
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1