Authentication And Security - Mitsubishi a2 Series Programming Manual

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Function Blocks 6
2 Simple Application Controllers
3 ) Sample VLS Program: Switch an irrigation system by SM
A system for plant irrigation can be switched ON and OFF by short message (B10). The start
of irrigation can be delayed. The delay time (in minutes) is transferred by short message. Also
the duration of irrigation can be set by short message.

6.31.1 Authentication and Security

Security of manipulation of a user program by SMR FB is given by the following items.
1) Password
A 4 digit numerical code can be set as an additional security level. This code must be located
from the first character of the short message, followed by the command delimiter '.'. The code
is set in the program parameter, thus valid for all SMR FB in a user program. Setting of a
password is optional.
2) Originators Phone Number
The received SM carries the phone number of the sending short message entity (SME). By
setting the phone number in FB parameter, only the SME with the setup phone number can
manipulate a SMR FB.
3) Command Text
Because the command text can be freely choosed by the customer it is possible to use
irregular command words that are only known by one person (like a computer password).
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