Signals - ABB Relion Technical Manual

1MRK 502 048-UUS A
17.15.4
17.15.5
17.15.6
17.16
17.16.1
Technical manual

Signals

Table 525: ATHSTAT Output signals
Name Type
USRBLKED BOOLEAN
LOGGEDON BOOLEAN
Settings
The function does not have any parameters available in Local HMI or Protection and
Control IED Manager (PCM600)
Operation principle
Authority status (ATHSTAT) function informs about two events related to the IED and
the user authorization:
• the fact that at least one user has tried to log on wrongly into the IED and it was
blocked (the output USRBLKED)
• the fact that at least one user is logged on (the output LOGGEDON)
Whenever one of the two events occurs, the corresponding output (USRBLKED or
LOGGEDON) is activated.
Denial of service
Functionality
The Denial of service functions (DOSLAN1 and DOSFRNT) are designed to limit
overload on the IED produced by heavy Ethernet network traffic. The communication
facilities must not be allowed to compromise the primary functionality of the device. All
inbound network traffic will be quota controlled so that too heavy network loads can be
controlled. Heavy network load might for instance be the result of malfunctioning
equipment connected to the network.
Basic IED functions
Description
At least one user is blocked by invalid password
At least one user is logged on
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