Open/find project, Using nifb – National Instruments NI-FBUS User Manual

Page 126

Appendix B

Troubleshooting and Common Questions

B-17

NI-FBUS Configurator User Manual

option of using a direct value rather than the PID-calculated value.
Which value you use depends on another parameter,

TRK_IN_D

Now go to the Scaling tab. You need to set the quality of the

TRK_IN_D

and

TRK_VAL

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, you want this to be 1. Connect

the switch in Lookout to the

TRK_IN_D.VALUE

of the PID object.

The Pot should be connected to

TRK_VAL.VALUE

One other thing to be aware of is that the PID algorithm in the firmware
revision 1 of the FP-3000 device has a problem. Its

PV_SCALE

must be

set to 0–100%. Other scaling options are ignored. Until this is
corrected in the firmware, a work-around is to simply use the percent
of scale value and set the

PV_SCALE

of your AO block to be 0–100%

as well.

You may also need to set

TRK_SCALE

to 0–100%. You should probably

use whatever values come directly from the

Pot

object in Lookout as

long as you set

TRK_SCALE

appropriately. If you have troubles, try

doing the scaling of the

Pot

(making it 0–100%) in Lookout.

Open/Find Project

If you want to load a saved process file, choose Cancel in the Add Links
dialog box, which appears at startup. Then, choose File»Open. Otherwise,
the NI-FBUS Configurator will open a new file automatically, and you will
have too many windows to keep track of.

One thing that is often confusing is knowing which configuration tree you
are in. If you have multiple configuration files open and then open the
Function Block Application Editor window, you can often lose track of
which configuration file they are manipulating. Notice that the name of the
active file appears in the title bar. Choosing File»Close will close that file.
The additional windows (Schedule, Function Block Application Editor
window, and so on) to the right correspond to the active configuration file.

Using NIFB

If you need to shut down NIFB and restart, you do not have to shut down
the NI-FBUS Configurator. After restarting NIFB, you can reconnect by
right-clicking the link (the top level in the hierarchy) and selecting Online.