Technical data

9.3.1.1 Start-up Response
During a PLC "cold restart" the various PLCs process the following start-up
OBs:
The start-up OBs have the following task with the global I/Os data
transmission mode;
➣
They must synchronize the CP 5430 TF/CP 5431 FMS interface.
➣
They can make sure that the PLC only starts up when certain or all
stations are ready to transmit and receive (i.e. when there are no GP
error messages).
➣
If you have selected the CYCLE-SYNCHRONIZED update mode, the
complete GP should be received at the end of a start-up OB.
Start-up OB OB 20 OB 21 OB 22
Device
S5-115U Cold restart after
STOP-RUN
transition (manual)
Cold restart after
power down
(automatic)
S5-135U
S5-155U
Cold restart
(manual)
Warm restart
(manual)
Warm restart
(automatic)
Table 9.4: Start-Up OBs for the Various Programmable Controllers
Communication with Global I/Os B8976060/01
Volume 1 9 - 42