Installation manual

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4-28 Input / Output MN1933
4.7 Reset states
During power up, NextMove PCI-2 is held in a safe non-operational state known as hardware
reset. It will also go into hardware reset if the 5 VDC supply drops below approximately
4.75 VDC, to prevent uncontrolled operation due to the electronics losing power . When
NextMove PCI-2 is in hardware reset for any reason, most of the controlled interfaces fall into
known states. It is also possible for NextMove PCI-2 to be in a state known as software reset.
This is a safe operational state where only the bootloader firmware present on NextMove
PCI-2 is running. 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.
Dual Port RAM (DPR) will contain no information at power up but will be accessible by the PC.
A reset during operation will cause the DPR to stay in its current state.
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 0 V by hardware during power-up and will return to 0 V on a reset.
Stepper / Encoder
During reset, the stepper outputs will not generate stepper pulses, and the encoder inputs will
not register any encoder input. If the unit goes into reset all position data will be lost.
4.7.1 System watchdog
The system watchdog provides hardware protection in the event of a firmware or embedded
‘C’ program malfunction. If the system watchdog is not updated, the controller is put into the
software reset state. It may be disabled during embedded code development and debugging.