Rockwell Automation 1788-FFCT NI-FBUS Configurator User Manual - Manual (Page 75)

Publication 1788-UM052B-EN-P - April 2002
Troubleshooting and Common Questions B-5
If the PID does not transition to AUTO mode, complete these steps:
1. Make sure that the AI and AO are publishing.
2. Make sure that the LAS executes the communication schedule. If
not, select Configure ⇒ Download Configuration to
download the configuration.
For information about downloading the configuration, refer to
the Downloading a Configuration section on page 4-31.
3. Make sure the target mode of the downstream block is set to
CAS.
If the AI does not transition to AUTO mode from OOS mode,
complete these steps:
1. Make sure the target mode is set to AUTO.
2. Make sure EU_UNITS is set to the value specified by the vendor.
If the function blocks are in OOS mode, set the target mode of the
resource block to AUTO.
Reading and Writing Errors
If you are unable to write to a block parameter, the parameter might
be read-only. However, if the parameter is not read-only, complete
the following steps to solve the problem:
1. Change the target mode to MAN or OOS and then try to write to
the parameter.
2. Check the range and make sure the value is not out of range.
If you receive frequent communication errors when you try to read or
write to a device, reduce polling. If the problem persists, reset the
device.