National Instruments FP-3000 - Manual (Page 125)

Appendix F Troubleshooting
© National Instruments Corporation F-7 FieldPoint FP-3000 User Manual
Common Questions
What can I do that would cause big problems with my FP-3000?
Turn off the power while the FP-3000 is writing its non-volatile memory.
The FP-3000 writes its non-volatile memory when you are downloading a
configuration or writing most parameters. The LED will be solid green
after the write starts. Just before the light goes out, the memory is being
updated. If the power is turned off during this time, the FP-3000 will lose
all blocks and your configuration. If this happens, you need to redownload
the configuration.
I am trying to control a PID loop within the FP-3000. On occasion, the
Lookout operator may want to override the output of the PID with a
manual output setpoint. How can I implement this?
1. Double-click on your PID block in the NI-FBUS Configurator to open
the block configuration window.
2. On the Options tab, click to the right of the CONTROL_OPTS
parameter. Check the box next to TRACK ENABLE . This gives you the
option of using a direct value rather than the PID-calculated value.
Whether you are using the calculated PID output or just tracking an
operator-set value at any given time is determined by the state of
TRK_IN_D . If it is On, you are tracking the TRK_VAL .
3. On the Scaling tab, set the quality of the TRK_IN_D and TRK_VAL to
Good_NonCascade . TRK_IN_D turns tracking on and off. For normal
PID operation, you want this value to be zero. To send the TRK_VAL
directly to the PID output, set this to 1 (On). Connect a switch for the
Table F-4. Resource Block Configuration Problems
Problem Action
Cannot bring resource block into
Auto mode.
Make sure the Reset switch is disabled. You cannot bring the
Resource Block into
Auto with the Reset switch On (this
prevents you from losing your entire configuration if you
inadvertently leave the Reset switch On).
Cannot set the WRITE_LOCK
parameter.
Make sure the Write Lock switch is Off. Changing the
WRITE_LOCK parameter is possible only when the Write Lock
switch is Off. If you want to disallow configuration writes to
the device, set the Write Lock switch to On, then write
Locked
to this parameter.