Contact bounce, e.g. caused by loose contacts on vibrating structures emits an easily traceable electrical signature. This attribute is used by the Segment Protectors, enabling them to detect contact bounce and other transient faults and to differentiate between them and normal fieldbus signals. Faults are therefore identified and isolated quickly and reliably. With this approach, the cause of the fault is isolated before it can disrupt communications, cause failures in other field devices, or cause plant operations to switch to safe mode.
Using this diagnostic concept allows another vexing problem to be contained: Contact bounce, caused by connecting and disconnecting connections during maintenance, can now be reliably detected and isolated. Even elusive temporary faults, such as declining signal levels caused by the ingress of rainwater, can be detected accurately with the new FieldConnex® Segment Protector. When signal levels drop below minimum requirements, the progressive fault detection system can identify the cause and location.
The notification is provided via LEDs on the Segment Protector in the junction box and via the FieldConnex® Advanced Diagnostic Module directly in the control room—the physical layer is monitored optimally in this way, avoiding time-consuming troubleshooting and clearly increasing plant availability.