Справочник Пользователя для National Instruments NI 9144

To reset the NI 9144 network configuration, unplug and replug in the 
NI 9144 chassis.

The NI 9144 has a safe state that lies between its configuration and 
operational states. When moving out of the operational state down to the 
configuration state, during normal operation or in case of a serious error, 
the NI 9144 passes through this safe state.

The safe state forces the data of output modules to pre-defined safe values, 
which are set by default to output zero volts for the default channel 
configuration. It is possible to change the safe values as needed by writing 
to the appropriate object dictionary entries for your output module.

There are two fundamental timing modes the NI 9144 can operate in: 
free-run and synchronized using the EtherCAT distributed clock through 
DC synchronized mode.

In free-run mode the NI 9144, by default, runs its conversion cycle as 
quickly as the slowest module allows. It is possible to slow the free-run 
conversion cycle down by writing a minimum cycle time in nanoseconds to 
the NI 9144’s index 0x3001.1.

In DC synchronized mode the NI 9144 begins each conversion cycle on a 
signal from the EtherCAT Master/scan engine. If the external cycle time is 
too fast for the given module configuration, the NI 9144 signals an error.

Firmware updates are performed via the File over EtherCAT (FoE) 
download protocol. All NI firmware update files have a suffix of

.foe 

and 

have internal identification information that guides the NI 9144 during the 
update. Refer to your specific master software documentation for the 
procedure of sending FoE downloads.

The NI 9144 firmware update does not use the filename or password 
information.