Reaction When Power Supply Is Switched On - Siemens SIMATIC S5 Manual

11.2.1 Reaction when power supply is switched on

Switching on the The table below shows you how the ET 200 distributed I/O system responds
power supply
when you switch on the power supply to the host.
Table 11-1 Reaction when power supply is switched on
Preconditions
CPU IM 308-C Error-
reporting
mode
STOP/ OFF –
RUN
1
STOP/ ST QVZ
RUN
1
PEU
None
1
STOP/ RN QVZ
RUN
1
PEU
None
1
: At least one DP slave must be configured for this error-reporting mode.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
PS
Reactions when power supply is switched on
CPU
CPU power-up is released.
You cannot access the inputs/outputs of the
distributed I/O system.
CPU power-up is released.
You cannot access the inputs/outputs of the
distributed I/O system.
CPU power-up is released.
Inputs are set to "0", outputs cannot be accessed
for write.
PEU remains set until all DP slaves with
error-reporting mode = PEU are addressable.
CPU power-up is released.
You cannot access the inputs/outputs of the
distributed I/O system.
CPU does not run up until all DP slaves are
addressable or until power-up delay has expired.
After power-up, all DP slave inputs are set to the
current values.
CPU does not run up until all DP slaves are
addressable or until power-up delay has expired.
PEU remains set until all DP slaves with
error-reporting mode = PEU are addressable.
After power-up, all DP slave inputs are set to the
current values.
CPU powers up.
The inputs of the DP slaves are set to the current
values.
IM 308-C – starting ET 200
DP slave Diagnostics
Outputs –
retain their
status.
Outputs Only the
retain their master
status. diagnostics
can be read. can be read.
CPU in Master and
STOP: slave
Outputs are diagnostics
set to "0". can be read.
CPU in CPU in
RUN:
Outputs are
updated
once the
CPU has
powered up.
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