NOTE
If you need to remove a device temporarily from the plant, you must log off the device.
Protection functions distributed to several devices operate in a healthy manner with the remaining devices
only if you have logged off the device.
You can log off the device as follows:
•
Via the on-site operation panel
•
Via a communication interface using the
Device logoff
(
_:319
) controllable
•
Via the binary inputs, general:
>Device funct.logoff on
(
_:507
) or
>Dev. funct.logoff off
(
_:508
)
You can find the controllable and the binary inputs in the DIGSI 5 project tree under Name of the
device→Information routing in the working area in the General block.
During the log-off process, the device checks whether all conditions for a logoff have been met. If the condi-
tions for the log off have not been met, the logoff is rejected.
The logoff is rejected under the following conditions:
•
The devices are communicating via the protection interface and switching off the device leads to an
interruption in protection-interface communication.
NOTE
The option used to log the device off is stored in the operational log.
Even if you switch off the device after logoff, the
Device logged off
(_:315) state is stored.
If you want to establish the initial state again after logging off the device, you must log on the device again.
To log on the device, you must use the same option used for logoff. For example, if you have logged off the
device via binary inputs, you must log it on again via the binary inputs. This applies in similar manner if you
have logged off the device via DIGSI or via on-site operation.
Application and Setting Notes
Logoff Options for a Device
You can log off a device as follows:
•
Via the on-site operation panel
•
Via communication via the controllable
Device logoff
(
_:319
)
•
Via the binary inputs, general:
>Device funct.logoff on
(
_:507
) or
>Dev. funct.logoff off
(
_:508
)
Conditions for Logging off the Device
[lo functional logoff device, 1, en_US]
Figure 3-89 Logic for Logging off the Device
3.8.4.2
System Functions
3.8 Other Functions
168 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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