semaphore TBOX LT2-530 Series, User Manual, Page: 146 / 197

Version : 1.09 146
Protection on Objects Inside Webform 2.0
Each object composing a webform
can be assigned “visibility” and
“write” levels of authorization
Example with WebForm 2.0
Ease of use recommendations
1. Common files
Files that everybody can see and files part of the template (icon, images, ...) should be assigned an
access level= 0. It means they are displayed with any level of user. A home page with access level=0 will
be displayed without requiring a login.
2. Protecting "IP" ports
Typically, Ethernet or GPRS communication port.
In case you need protection against writing to Tags or sending a program.
If the port is also protected, two login will be required: HTTP and ModBus/TCP.
3. Reminder about writing to Tags
If the communication port is protected and the presentation of the Tag is set "write enable" (see tab
"Presentation" of the concerned Tags) user requires access level = 2 (Read/Write) to change value.
A user with access level = 3 can always change Tag value.
A login at ModBus level will be also required if the port has been protected (see above).
17.1.5. ModBus TCP protection on socket
A TCP communication is based on “Sockets”. They allow multiple, simultaneous communication:
ONE socket = ONE communication context
TB
OX
LT2
supports 64 communication contexts.
Without the option checked: the protection is based on the com. port only:
When someone logs in to a communication port as “Engineer”, all users connecting after him will be
automatically logged as “Engineer” too …
With the option checked: the protection is based on sockets:
Each user connecting to a protected communication port has to log in, individually