Emerson AMS Trex User Manual page 172

Fieldbus Diagnostics application
Figure 5-8:
How noise affects the fieldbus segment
The fieldbus segment can function properly with large amounts of low-frequency noise,
small amounts of in-band noise, or moderate amounts of high-frequency noise. In-band
noise is most likely to directly impact fieldbus communications. Bursts of in-band noise can
cause the fieldbus network to slow down due to the messages being resent multiple times.
Devices may also disconnect from the network if the in-band noise becomes too high/
frequent.
High-frequency noise seldom impacts fieldbus communications, but it may cause
measurement errors or the device may restart.
Related information
164
Highest amplitude marked with black outline
Troubleshooting Fieldbus Diagnostics
User Guide