F30 03 3 Product Description
HI 800 473 E Rev. 1.00 Page 21 of 46
3.4.3 Reset Key
The controller is equipped with a reset key. The key is only required if the user name or
password for administrator access is not known. If only the IP address set for the controller
does not match the PADT (PC), the connection can be established with a Route add entry
on the PC.
The key can be accessed through a small round hole located approximately 5 cm from the
upper left-hand side of the housing. The key is engaged using a suitable pin made of
insulating material to avoid short-circuits within the controller.
The reset is only effective if the controller is rebooted (switched off and on) while the key is
simultaneously engaged for at least 20 seconds. Engaging the key during operation has no
effect.
WARNING
Caution! Fieldbus communication may be disturbed!
Prior to switching on the controller with the reset key engaged, all device fieldbus
connectors must be unplugged to ensure that the fieldbus communication among
other stations is not disturbed.
The fieldbus plugs may only be plugged in again when the controller is in the RUN or
STOP state.
Properties and behavior of the controller after a reboot with engaged reset key:
Connection parameters (IP address and system ID) are set to the default values.
All accounts are deactivated except for the administrator default account with empty
password.
Loading a user program or operating system with default connection parameters is
inhibited!
The loading procedure is only allowed after the connection parameters and the account
have been configured on the controller and the controller has been rebooted.
After a new reboot without the reset key engaged, the connection parameters (IP address
and system ID) and accounts become effective.
Those configured by the user.
Those valid prior to rebooting with the reset key engaged, if no changes were
performed.
3.4.4 Hardware Clock
In case of loss of operating voltage, the power provided by an integrated gold capacitor is
sufficient to buffer the hardware clock for approximately one week.
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