Access Control - Siemens SITRANS F Series Operating Instructions Manual

Manufacturer name 12 bytes
Product name 32 bytes
Product firmware 16 bytes
version
CRC 2 bytes
A.10

Access control

Access control manages whether the Modbus master is allowed to modify device parameters.
Reading of parameters is always possible. The general access control rules are:
• The Modbus interface has an access level that can be changed by providing PIN information
via the Modbus register 8292 (User PIN) or 8293 (Expert PIN).
• Each parameter has a protection level assigned that specifies the required access level to
modify the parameter via the Modbus interface.
• If the access level of the Modbus interface is lower than the protection level of the parameter
that is desired to be modified, then the attempt to modify the parameter is rejected by the
device.
Table A-7 Access control
Access level Description
Read only The Modbus master is not able to modify the device configuration (setup parameters).
The Modbus master is only able to execute the command, to reset PINs.
This is the default level of the Modbus interface.
User The Modbus master has to provide the correct user PIN with Modbus register 8292 to reach this access
level.
The Modbus master is able to modify a subset of the device configuration.
Expert The Modbus master has to provide the correct expert PIN with Modbus register 8293 to reach this access
level. The Modbus master is able to modify the configuration of the device.
If an incorrect user PIN or an incorrect expert PIN is entered, or if the device does not receive any
request within 10 minutes, the device resets the access level to read only.
SITRANS FST090
Operating Instructions, 11/2021, A5E50387341-AA
SIEMENS
SITRANS F
-
Modbus communication
A.10 Access control
99