Siemens SIMATIC S5 Manual page 221

12.3.2 Reaction after power failure in the S5-95U (restoration of mains
power)
Restoration of The status of the S5-95U when mains power failed was RUN and when mains
mains power power is restored the status is again RUN.
Precondition: The backup battery is installed in the S5-95U and charged.
Response of bus The table below shows you how the ET 200 distributed I/O system responds
system to the restoration of mains power.
Table 12-2 Reaction after power failure in the S5-95U (restoration of mains power)
Preconditions
S5-95U as DP
master
Restoration of Diagnostics data, DP inputs and outputs are cleared.
mains power
Diagnostics data and DP inputs are updated
DP outputs are written
You can access the inputs/outputs of the distributed I/O system.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
PS S5-95U
Reactions
S5-95U as DP master
S5-95U – starting ET 200
DP slaves
Inputs are read
Outputs are
updated d t d
12-7
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