Search FAQs

What happens when communication is lost with the TeSys Island Controller?

Issue:
TeSys Island communication loss

Product Line:
Tesys Island

Environment:
Digital multifunctional load management solution

Resolution:

With either Modbus TCP or EtherNet/IP, communication loss with the controller is detected by the Bus Coupler. There is a configurable parameter "Communication Loss Timeout". After that number of seconds, the system will go into "Degraded Mode". In degraded mode, all outputs are set to a fallback position - for Load and Device Avatars, this is off/open/0. All data is reported as zero/default. Upon restoration of communication, the behavior depends on the setting "Enter Degraded Mode Auto-Reset". If this is set to YES then the system will exit degraded mode and start executing commands again. If this is set to NO, then a System Restart command or power cycle is required.

For Modbus TCP, communication loss is defined as not receiving a write to the IO Scanning registers
For EtherNet/IP, communication loss is defined as closing the explicit owner connection