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5 Operating modes of the CPC12 bus controller
5.1 Operating mode: Start-up mode
The CPC12 bus controller is initialised by applying the supply
voltage. The device will carry out internal programme memory
tests and self test routines. During this time a communication
via the interfaces is not possible.
Please observe that the supply voltage of the CPC12 bus
controller must be applied latest one second after applying the
supply voltage of the circuit protectors. Otherwise the circuit
protectors will work in the »stand-alone mode«, i.e. without
internal communication between circuit protectors and bus
controller.
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 this operating mode there is no connection between the bus
controller and the superordinate control unit. In this case the
CPC12 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. After connection is built
up to the superordinate control unit, this operating mode will be
left and the 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 CPC12 bus controller is involved
in an EtherCAT system. Communication to the CPC12 bus
controller works faultlessly and the controller can be addressed
and controlled by the superordinate control unit. Should the
communication fail, this has no influence on the protective
function of the circuit protectors. The behaviour of the bus
controller with simultaneous use of a field bus interface and of
the web server 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 interface or the Web
Server 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.
5.5 Operating mode: Firmware Update
Mode
The devices are supplied with a software programmed according
to their functionality. If the functions of the devices are extended,
they will be added by firmware update. It is therefore necessary to
carry out a firmware update if the new functionality shall be used.
