Operation; Indicators; Fault Detection, Physical Layer Diagnostics; Device Signal Level - Pepperl+Fuchs R2-SP-IC Series Manual

Segment Protector

Operation

5 Operation
5.1

Indicators

The Segment Protectors include the following LEDs:
1 LED as indicator for power on the trunk
■
1 LED as indicator for bus communication activity and the physical layer diagnostic status
■
Up to 12 LEDs for up to 12 spurs as short circuit condition or fault indicator for each output
■
(spur)
Trunk power LED PWR:
If the fieldbus trunk voltage exceeds 10 V, the LED is ON.
Diagnostic State LED COM:
Depending on the diagnostic state, the diagnostic LED is either ON or flashing. For further
information, see chapter 5.2.
Diagnostic State
No communication
Communication active
Maintenance required
Out of Specification
Auxiliary alarms:
ELS-1 water sensor alarm
■
*LBF-IA1*, Surge
■
Protector alarm
Spur fault LED:
If the spur current exceeds its maximum short circuit current, the spur fault LED is switched ON.
5.2

Fault Detection, Physical Layer Diagnostics

The device coupler can monitor the important physical layer parameters for each participating
field device, e. g., communication signal levels and signal jitter. The monitored values are
compared to fixed-limit values derived from the IEC 61158–2 physical layer specification or
from empirical data.
After a fault or deviation has been detected, a single yellow LED serves as fault indicator at the
respective device coupler. For more information see chapter 5.1
Using Pepperl+Fuchs "Advanced Physical Layer" solutions, e. g., the diagnostic module HD2-
DM-A, show the diagnostic state of the individual device in the specific working environment of
the process control system. For more information, consult the documentation of the respective
diagnostic product.
5.2.1

Device Signal Level

In order to detect the following kind of faults or problems, device signal level monitoring and
diagnostics are important:
Incorrect segment termination
■
Improper trunk or spur wiring
■
Loose wires
■
Water ingress in the device coupler or field device housing
■
24
Diagnostic LED Enunciation
LED: OFF
LED: ON
LED: 1 pulse per second
LED: 2 close pulses per
second
LED: 3 close pulses per
second
LED Sequence