Siemens SENTRON 3WA System Manual page 42

Modbus TCP
5.8 Modbus TCP whitelist
IP addresses
It is possible to enter up to ten IP addresses or IP address ranges in the COM190. The IP
address range is defined by a start IP address and an end IP address. The start IP address and
the end IP address and all the IP addresses lying between them are approved.
Note
If only one IP address is to be approved, the start IP address and the end IP address must be
identical.
Roles
Two different access rights (roles) can be assigned to the approved IP addresses.
Based on the assigned role, the following access right is defined for the approved IP address
or IP address range:
• Read-only
• Read and write (no restrictions)
Scope
NOTICE
Unauthorized access with two COM190 communication modules
The Modbus TCP whitelist only affects the Modbus TCP communication of the module on
which it has been set up.
If you have two communication modules, set up two Modbus TCP whitelists and activate
both lists.
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3WA Air Circuit Breaker Communication
System Manual, 11/2021, 92310000004-02