Manual VIPA System 300V Chapter 6 Deployment CPU 31x with TCP/IP
HB130E - CPU - Rev. 11/50 6-35
Start-up behavior
When the power supply is turned on, the CPU and the CP execute the
respective BIOS routine (hardware and driver initialization and memory
test).
While the CPU detects which modules have been installed on the back
panel bus and loads the application program, the CP starts the page frame
administration routine.
After app. 15s the CP waits for the synchronization request from the CPU.
In this condition data communication with the PLC is inhibited and it is only
enabled after synchronization has taken place.
The boot time of the CPU 31xNET including the CP section amounts app.
18s.
With every status change from STOP to RUN and vice versa back to RUN,
the CPU31xNET performs a cold-/warm start. All connections are cleared
and reestablished after the CP job boot.
Three different reasons can cause these status change requests:
• Resynchronization of at CP by the SYNCHRON-HTBs of the CPU
(warm start) after it has already been synchronized,
• STOP/START function of the configuration tool WinNCS (warm start),
• Reset (warm start).
Note!
When a defective project engineering is transferred to the CP so that is not
able to start, the project engineering is deleted and a default setting is
used. Here the CP gets its original IP address again.
This allows you to clear the CP independently from the CPU.
Start-up
Status after
CP start-up
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