E-T-A ControlPlex CPC20, User Manual

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5 Operating modes of the CPC20 bus controller
5.1 Operating mode: Start-up mode
The CPC20 bus controller is initialised by applying the supply
voltage. The device will carry out implemented programme
memory tests and self test routines. During this time a
communication via the interfaces is not possible.
5.2 Operating mode: System error mode
If a failure is detected during the self test routines, the bus
controller will change into operating mode System Error. This
operating mode can only be discontinued by way of re-starting
the device and it prevents the data exchange via the interfaces.
If the bus controller is in this operating mode, it is unable to
control the electronic circuit protectors and these will stay in the
stand-alone mode (overcurrent protection).
5.3 Operating mode: Configuration error
mode
If there are no valid or invalid configuration data available in
the bus controller, it will change into this operating mode. This
operating mode only allows non-cyclical data exchange. Cyclical
data exchange is prevented. Leave this operating mode upon
receipt of the correct slot parameters and configuration data.
5.4 Operating mode: stand-alone mode
In normal duty there is a connection between the bus controller
and the superordinate control unit. Thus the control of the
electronic circuit protectors and the change of their parameters
is executed by the superordinate control unit. Should the
communication between both participants fail, this has no
influence on the protective function of the circuit protectors. In
this case the CPC20 bus controller will automatically adopt the
control and parameterisation of the electronic circuit protectors,
because all required data sets are saved within the CPC20. By
means of the web server, the electronic circuit protectors, their
status and parameters can be accessed via the Ethernet interface
interface. It is thus possible to change e.g. parameter data of
the various electronic circuit protectors. If the failure on the
communication level is remedied, this operating mode will be left
and the superordinate control unit will take over control again as
master. If during this time a parameter was changed while there
was no communication, this will be signalled to the superordinate
control unit. In this case the user can correspondingly define the
control behaviour and it can be programmed in the programmable
control unit. This allows the user to select a reaction meeting his
requirements.
5.5 Operating mode: Slave mode
In this operating mode the CPC20 is involved in a PROFINET
system. Communication to the CPC20 bus controller works
faultlessly and the controller can be addressed and controlled
by the superordinate control unit.
The behaviour of the bus controller with simultaneous use of
a field bus interface and of the web server or the USB service
and maintenance interface can be determined by means of the
configuration of the device in the superordinate control unit. It can
be pre-selected there that Ethernet and/or the USB service and
maintenance interface are granted either only reader access or
reader and editor access. In the event of editor access, changes
of the parameterisation of the electronic circuit protectors can be
carried out in parallel to the field bus system. These parameter
changes will then be advised to the superordinate control system
and can be adopted by it or also overwritten. The user can select
the behaviour accordingly.