Digital Input Module
6-5
Sleep Mode
Each DI module can be switched by the user application program to Sleep Mode. In Sleep
Mode, the module does not function and the power consumption is minimized. During Sleep
mode, the user application program will get the predefined values (PDV) for each I/O.
Module Status and Diagnostics
In the event of DI Module failure, the I/O module ERR LED will be lit. This event is
registered by the CPU in the Error Logger. DI Module failure status is also visible to the user
application program.
The DI module can be diagnosed and monitored using the STS Hardware Test utility. This test
verifies that the module is operational, presents the module configuration and shows the actual
value of each input. It is also possible to change the input filter setup temporarily for the
duration of the Hardware Test.
In the Hardware Test utility, it is possible to set the DI module to Freeze Mode. In this mode
the user application program will get the predefined value of each input in the module, instead
of the actual input value. Freeze mode enables testing the inputs while the user application
program is running.
For details on configuring the DI modules, see the Site Configuration section, and the
Application Programming section of the STS User Guide.
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