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4-22 Input / Output MN1904
4.8 Reset states
During power up, NextMove BX
II
is held in a safe non-operational state known as hardware
reset. It will also go into hardware reset if the 24V logic supply drops below approximately
18V. This prevents uncontrolled operation due to the electronics losing power. When
NextMove BX
II
is in hardware reset for any reason, most of the controlled interfaces fall into
known states.
It is also possible for NextMove BX
II
to be in a state known as software reset. This is a safe
operational state where only the bootloader present on NextMove BX
II
is running, because no
valid firmware has been found. This can happen if a firmware download is cancelled before it
has finished. Use WorkBench v5 to download new firmware, allowing the process to finish.
This might take 1-2 minutes.
Hardware and software reset states should not be confused with the Mint keyword RESET
whichisusedtoclearaxiserrors.
Communications
At power up the CAN controllers will be held in reset and will have no effect on the CAN
buses. If a reset occurs during the transmission of a message CAN errors are likely to occur.
Digital Outputs
All of the digital outputs are inactive on power up regardless of their polarity. They will return
to the inactive state whenever a reset occurs.
Analog Outputs
All analog outputs are set to 0V by hardware during power up and will return to 0V on a reset.
Encoders
The encoder interfaces will not register any encoder input during reset. If the unit goes into
reset all position data will be lost.
4.8.1 System watchdog
The system watchdog provides hardware protection in the event of a firmware or ‘C’ program
malfunction. If the system watchdog is not updated, the controller will be reset.