Baldor MN1903 installation manual Reset states, Emulator connection, System watchdog

4.7 Other I/O

4.7.1 Emulator connection

An 11-pin footprint on the rear of the card marked ‘ICE’ provides access to the processor for boundary scan emulation. To connect the Texas Instruments emulator pod, a two row 12-pin 0.1in pitch surface mount pin header with pin 8 missing must be fitted. The connections are those specified by Texas Instruments. See the ‘MintMT Embedded Programming Guide’ for details on emulator based system debugging.

4.8 Reset states

During power up, NextMove PCI is held in a safe non-operational state known as hardware reset. It will also go into hardware reset if the 5V supply drops below approximately 4.75V, to prevent uncontrolled operation due to the electronics losing power. When NextMove PCI is in hardware reset for any reason, most of the controlled interfaces fall into known states. It is also possible for NextMove PCI to be in a state known as software reset. This is a safe operational state where only the bootloader firmware present on NextMove PCI is running. Hardware and software reset states should not be confused with the Mint keyword RESET which is used to clear axis errors.

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 0V by hardware during power-up and will return to 0V on a reset.

Stepper/Encoder ASICs

The stepper/encoder ASICs will not generate stepper pulses or 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 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.

MN1903 Input / Output 4-23