Rockwell Automation FactoryTalk Historian SE DataLink 4.2 User Guide - Manual (Page 93)

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*.*.*.*, DISALLOW 192.168.100.*, ALLOW
allows connections only from TCP/IP addresses starting with 192.168.100.
FactoryTalk Historian Trusts
A FactoryTalk Historian trust allows clients to connect to a FactoryTalk
Historian server machine and retrieve data without explicit user login. A
trust may instead allow a user to log in based on an IP address, Windows
domain, user name, application or other criteria.
FactoryTalk Historian trusts are established on the FactoryTalk Historian
server and stored in a trust database.
Point Access Permissions
FactoryTalk Historian DataLink prompts the user for a user name and
password upon connection to a FactoryTalk Historian server. The user
name is used in conjunction with the PtOwner, PtAccess, DataOwner, and
DataAccess fields.
For example, if the sinusoid tag is configured with PtAccess
O:RW, G:NONE, W:NONE, and PtOwner is user1, a user must log
in as user1 in order to access the tag. Otherwise, the tag cannot be
found.
If sinusoid DataAccess is O:R, G:NONE, W:NONE, and
DataOwner is user1, a user must log in as user1 in order to see
sinusoid tag data. Otherwise, a read access error message is returned.
However, the same user may not write data to sinusoid because the
DataAccess attribute is O:R (read only). The FactoryTalk Historian
System Manager would need to change DataAccess to O:RW (read and
write) to enable a user logging in as user1 to read and write data to
sinusoid.