Specifications

CP143 H1 / TCP/IP manual Commissioning
Rev. 00/07 6-7
6.2 Start-up properties
When power is turned on the CP143 H1 / TCP/IP executes the BIOS routines (hardware
initialization, memory test, initialization of drivers).
Once the CP-job is started the CPs program control is initiated. The frames of the DPR are only
controlled from this point onwards, i.e. after the CP-job has booted up (app. 10 seconds after power
on). At this time the unit waits for the synchronization from the PLC. Data communications with the
PLC is inhibited in this state (IDLE; RUN and STOP-LED LEDs are on) and it is only enabled
again after synchronization has been completed.
• For this reason the requirements of balanced synchronization characteristics (a HTB
synchronization module waits between 8 and 10 seconds, depending on the type of CPU) can not
be met. The start-up OBs 20-22 must therefore perform the following actions:
• poll the PAFE of the HTB in synchronous mode until this == 0. After 10 seconds the frame
will be set to active by the CP.
• If the synchronous HTB still detects a PAFE != 0 after 15 seconds then the PLC, the
configuration of the PLC or the CP is incorrect.
• In this case the respective configuration must be checked.
Depending on the sequence in which the synchronous HTBs were initiated, the CP may detect a
synchronous request and re-boot when more than one frame of a CP must be synchronized. Under
these conditions the CP would never be synchronized. Cure: switch the CP to STOP by means of
the respective switch, then synchronize all the required frames. Change the switch back to RUN. At
this point the CP has been synchronized. This reaction of the system that can only occur during
commissioning, and then only, if the number of frames of the CP is increased and the new
synchronous HTB is not accessed as the last one in the sequence.
6.2.1 Status after the CP has started
The CP143 H1 / TCP/IP executes a cold/warm start when the status changes from STOP to RUN
and from RUN via STOP back to RUN. Any active connection is terminated and re-established after
the CP-job has booted.
These status changes can have four possible reasons
• re-sychronization of a CP that is already in synchronous mode by means of the
synchronous HTBs of the CPU (warm start),
• STOP/START switch (cold start),
• STOP/START function of the configuration tool NCS (warm start),
• reset-all (warm start)
Depending on the START-/STOP switch, the CP143 H1 / TCP/IP branches to one of the following:
Before synchronization
• to the STOP state, if the switch is in the STOP position, or
• to the IDLE state, if the switch is in the RUN position.
After synchronization
• to the STOP state, if the switch is in the STOP position, or
• to the RUN state, if the switch is in the RUN position.