User manual

IEC61131 User and Reference Manual
April 22, 2008
250
</securityTokens>
</controller>
There is no limit to the number of items that can be listed in the securityTokens section. The
file may contain more information than that listed above, but any additional information will
not be used. Any token listed must be represented as a hex value without any prefix or
suffix, for example:
<token>A1B2C3D4</token>
The security tokens are not keyed to the mass storage device that they reside on. This
improves the usability of the security token; however it does reduce the security offered by
the token since the tokens could be freely copied from one device to another.
When a security token is read that matches that of a data log then the data log data will be
transferred if that the data log is configured for auto transfer mode.
If a data log is configured to have a security token value of 0x00000000 then the security is
disabled on this log.
Because security tokens are checked on external USB media for auto transfer logs, the
definition of the token during log creation is meaningless for pure internal or mass storage
logging modes as well as for any logs on controllers which do not support an USB host.