National Instruments NI-FBUS - Manual (Page 112)

Appendix B Troubleshooting and Common Questions
© National Instruments Corporation B-3 NI-FBUS Configurator User Manual
The Fieldbus device stays in OOS mode even though the resource block
MODE_BCK.TARGET = Auto and MODE_BCK.ACTUAL = Auto .
The Fieldbus device needs to be configured. Start by dragging the function
block in question, such as an AI, AO, or PID block, into the Function Block
Application Editor window. The block does not need to be connected with
anything else. Then, download the configuration—this will allow it to
execute on the device. If there are problems, try the following solutions:
• Make sure that the resource block is in Auto mode—not OOS . This is
found by either checking which button is depressed in the resource
block’s block configuration window or by looking at the
MODE_BCK.ACTUAL .
• See if the Options parameter is in Run . If so, check the Block_ERR
in the resource block—it should be zero.
• Go to the I/O function block in question, and make sure that the
OUT/IN.status is in Good … mode. If not, go to the Block_ERR
parameter and see what the problem is.
The resource block must be in Auto mode for any other blocks in the device
to execute. The resource block is a good place to start troubleshooting if the
device is not behaving as desired. It has diagnostic parameters that help you
determine the cause of the problem.
A resource block specifies the general characteristics of the resource. This
includes the device type and revision, manufacturer ID, serial number, and
resource state. Each device has only one resource block. The resource block
also contains the state of all of the other blocks in the device.
If the device cannot change its ACTUAL mode to the TARGET mode, first
verify that you have downloaded the configuration to the device. If the
configuration has been downloaded, you can diagnose the problem by
looking at the
BLOCK_ERR parameter of the function block. This parameter
often identifies the problem. For example, if the device resource block is
off-line, the
BLOCK_ERR parameter will read Resource Block Offline ,
indicating that you must change the resource block to Auto mode before
you can change the function block mode. Also, if the device is an FP-3000,
you can look at the additional parameters on the Diagnostics tab in the
block configuration window. Notice that the
LAST_BLOCK_EVENT is not
cleared after an error condition clears. Check the time stamp to determine
whether the event you are looking at is current.