Modbus TCP
5.8 Modbus TCP whitelist
3WA Air Circuit Breaker Communication
System Manual, 11/2021, 92310000004-02
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Structure of the whitelist
The whitelist contains the following information and entries:
• Status - Active
Indicates whether or not the whitelist is active.
The whitelist is active if at least one filter entry is present and active. The whitelist is
deactivated if no filter entry is present or active.
• Status – RecoveryError
Is active if an error has occurred when loading the whitelist or if an incorrect filter entry is
present.
• Status – AccessRights
Indicates the rights status for the current TCP connection.
It provides information as to whether "read-only" or "read and write" are possible for the
current connection.
• Ten filter entries
– Parameter – Enable
Defines whether or not the filter entry is active.
– Parameter – IPLowerBound
Defines the lowest IP address in the IP range to be approved.
– Parameter – IPUpperBound
Defines the highest IP address in the IP range to be approved.
– Parameter – Role
Defines the rights of the IP range or the IP address.
Remote switching protection RSP and parameter write protection
The Modbus TCP whitelist can be combined with remote switching protection RSP and
parameter write protection (DIP switches). Remote switching protection RSP and parameter
write protection have a higher priority however. The write rights of the Modbus TCP whitelist
can therefore be restricted.
You can find information on remote switching protection and parameter write protection in
the Equipment Manual, see Chapter Reference documents (Page 5).
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