Rockwell Automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS PA Linking Device User Manual - Manual (Page 53)

Rockwell Automation Publication 1788-UM058B-EN-P - September 2014 53
Diagnostics Chapter 4
The field device indicates red in the AOP.
The field device indicates Err on LCD of module.
No process variable is found in the process variable tag of the field
device.
Launch the DTM
and see if the
device has any
errors.
Check the scope trace in the AOP:
• Is there any noise on the bus?
• Is the slew rate ok? The wave
must not be triangular.
• Is the signal amplitude
modulated? This condition
typically indicates noise on the
shield.
• Is the voltage level ok?
Has the environment changed?
Is there a new source of noise, such as drives, motors, HT cables, or other noise sources?
Has the PA configuration been changed?
Have any new field devices been added to the bus?
Table 6 - Field Device Faults Diagnostic Checks (Continued)
Symptoms Checks